{"id":101320,"date":"2026-04-24T09:18:35","date_gmt":"2026-04-24T09:18:35","guid":{"rendered":"https:\/\/healthandlifeonline.com\/?p=101320"},"modified":"2026-09-13T11:18:47","modified_gmt":"2026-09-13T11:18:47","slug":"conciencia-cerebro-sueno","status":"publish","type":"post","link":"https:\/\/healthandlifeonline.com\/es\/brain-activity-and-consciousness-during-sleep\/","title":{"rendered":"Actividad Cerebral y Conciencia Durante el Sue\u00f1o"},"content":{"rendered":"\n[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221;][et_pb_row _builder_version=&#8221;4.27.6&#8243; _module_preset=&#8221;default&#8221; hover_enabled=&#8221;0&#8243; global_colors_info=&#8221;{}&#8221; theme_builder_area=&#8221;post_content&#8221; use_custom_gutter=&#8221;on&#8221; gutter_width=&#8221;1&#8243; width=&#8221;100%&#8221; module_alignment=&#8221;center&#8221; 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0;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div class=\"hlsleep-premium\">\r\n\r\n  <header class=\"hlsleep-hero\">\r\n    <div class=\"hlsleep-lang hlsleep-lang-en\">\r\n      <p class=\"hlsleep-kicker\">Neuroscience and consciousness<\/p>\r\n      <h1 class=\"hlsleep-title\">Brain Activity and Consciousness During Sleep<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Current knowledge, emerging hypotheses and the limits of explanation<\/p>\r\n      <p class=\"hlsleep-byline\">By Olga Hom<\/p>\r\n    <\/div>\r\n    <div class=\"hlsleep-lang hlsleep-lang-de\">\r\n      <p class=\"hlsleep-kicker\">Neurowissenschaft und Bewusstsein<\/p>\r\n      <h1 class=\"hlsleep-title\">Gehirnaktivit\u00e4t und Bewusstsein im Schlaf<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Aktueller Wissensstand, entstehende Hypothesen und Grenzen der Erkl\u00e4rung<\/p>\r\n      <p class=\"hlsleep-byline\">Von Olga Hom<\/p>\r\n    <\/div>\r\n    <div class=\"hlsleep-lang hlsleep-lang-es\">\r\n      <p class=\"hlsleep-kicker\">Neurociencia y conciencia<\/p>\r\n      <h1 class=\"hlsleep-title\">Actividad cerebral y conciencia durante el sue\u00f1o<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Conocimiento actual, hip\u00f3tesis emergentes y l\u00edmites de la explicaci\u00f3n<\/p>\r\n      <p class=\"hlsleep-byline\">Por Olga Hom<\/p>\r\n    <\/div>\r\n    <div class=\"hlsleep-lang hlsleep-lang-ca\">\r\n      <p class=\"hlsleep-kicker\">Neuroci\u00e8ncia i consci\u00e8ncia<\/p>\r\n      <h1 class=\"hlsleep-title\">Activitat cerebral i consci\u00e8ncia durant el son<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Coneixement actual, hip\u00f2tesis emergents i l\u00edmits de l'explicaci\u00f3<\/p>\r\n      <p class=\"hlsleep-byline\">Per Olga Hom<\/p>\r\n    <\/div>\r\n  <\/header>\r\n\r\n  <section class=\"hlsleep-visual-card\">\r\n    <p class=\"hlsleep-visual-heading\">\r\n      <span class=\"hlsleep-inline hlsleep-inline-en\">A visual map of nocturnal consciousness<\/span>\r\n      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font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">open question<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">offene Frage<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">cuesti\u00f3n abierta<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">q\u00fcesti\u00f3 oberta<\/text>\r\n        <g transform=\"translate(535,74)\">\r\n          <rect x=\"0\" y=\"0\" width=\"314\" height=\"340\" rx=\"26\" fill=\"#ffffff\" stroke=\"#dde1e7\" stroke-width=\"1\"\/>\r\n          <line x1=\"38\" y1=\"72\" x2=\"38\" y2=\"272\" stroke=\"#d1d8e0\" stroke-width=\"1.2\"\/>\r\n          <circle cx=\"38\" cy=\"72\" r=\"6\" fill=\"#c47a4f\"\/>\r\n          <circle cx=\"38\" cy=\"122\" r=\"6\" fill=\"#d7e2ef\"\/>\r\n          <circle cx=\"38\" cy=\"172\" r=\"6\" fill=\"#9db9d5\"\/>\r\n          <circle cx=\"38\" cy=\"222\" r=\"6\" fill=\"#5f8dbb\"\/>\r\n          <circle cx=\"38\" cy=\"272\" r=\"6\" fill=\"#244d78\"\/>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">ordinary perception<\/text>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">gew\u00f6hnliche Wahrnehmung<\/text>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">percepci\u00f3n ordinaria<\/text>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">percepci\u00f3 ordin\u00e0ria<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">NREM and REM patterns<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">NREM- und REM-Muster<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">patrones NREM y REM<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">patrons NREM i REM<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">mixed states<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">Mischzust\u00e4nde<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">estados mixtos<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">estats mixtos<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">inner observation<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">innere Beobachtung<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">observaci\u00f3n interna<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">observaci\u00f3 interna<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">experience not yet fully explained<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">noch nicht vollst\u00e4ndig erkl\u00e4rte Erfahrung<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">experiencia a\u00fan no explicada del todo<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">experi\u00e8ncia encara no explicada del tot<\/text>\r\n        <\/g>\r\n      <\/svg>\r\n    <\/div>\r\n\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-en\">\r\n      Sleep is shown here as a changing field of brain states, thresholds and subjective experience, rather than as a single state of reduced activity.\r\n    <\/p>\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-de\">\r\n      Schlaf wird hier als ver\u00e4nderliches Feld aus Gehirnzust\u00e4nden, \u00dcberg\u00e4ngen und subjektivem Erleben dargestellt, nicht als ein einheitlicher Zustand verminderter Aktivit\u00e4t.\r\n    <\/p>\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-es\">\r\n      El sue\u00f1o se presenta aqu\u00ed como un campo cambiante de estados cerebrales, umbrales y experiencia subjetiva, no como un estado \u00fanico de actividad reducida.\r\n    <\/p>\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-ca\">\r\n      El son es presenta aqu\u00ed com un camp canviant d'estats cerebrals, llindars i experi\u00e8ncia subjectiva, no com un estat \u00fanic d'activitat redu\u00efda.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <article class=\"hlsleep-article\">\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-en\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Every night, for several hours, consciousness shifts away from its ordinary dependence on the external world and enters a form of internal organisation that we still do not fully understand. Sleep is not simply the absence of wakefulness. During sleep, the brain changes its patterns of activity, regulates essential physiological functions, reorganises memory and emotion, and can at the same time generate subjective experiences with narrative structure, affective intensity, a sense of presence and, in some cases, reflective awareness.<\/p>\r\n\r\n        <p>A dream is not an image observed from the outside. While we dream, the experience is lived from within. The subject responds, interprets, feels, fears, decides or accepts an internal logic that may only appear incoherent after waking. During the dream itself, the experience has phenomenological reality. It does not depend on ordinary contact with the environment, yet it cannot simply be separated from the brain. This is precisely why sleep is such a privileged field for the study of consciousness.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>What sleep neuroscience has already established<\/h2>\r\n\r\n      <p>Sleep neuroscience has advanced considerably in recent decades. NREM and REM sleep can now be described with precision, electrical patterns can be recorded, neurochemical changes can be identified and the activity of regions involved in sleep regulation and dream formation can be studied, including the brainstem, thalamus, hypothalamus and hippocampus. Sleep is also known to participate in memory consolidation, emotional regulation, synaptic reorganisation and metabolic clearance processes associated with the glymphatic system.<\/p>\r\n\r\n      <p>This knowledge is essential, but it does not resolve the central problem. Describing the architecture of sleep is not the same as explaining how that architecture becomes conscious experience. We can observe phases, rhythms, networks and structures. What remains difficult is understanding how these processes come to constitute a lived scene, a felt emotion, a recognised presence or a form of awareness that, within the dream itself, may even know that it is dreaming.<\/p>\r\n\r\n      <h2>Where the classical model reaches its limits<\/h2>\r\n\r\n      <p>Lucid dreaming is one of the clearest examples. In these episodes, the person recognises that they are dreaming while the dream continues. Studies by Ursula Voss, Martin Dresler and other researchers have shown that lucid dreaming may involve a hybrid state, with characteristics of REM sleep and wakefulness, including activity in prefrontal regions associated with self-reflection and executive control. This does not fit comfortably with a simplified view of sleep as a global reduction of brain activity.<\/p>\r\n\r\n      <p>Hypnagogic and hypnopompic experiences also force us to refine this view. During the transition into sleep or out of sleep, people may experience voices, images, figures or a sense of presence. These experiences are not necessarily pathological and have been described in healthy individuals. Their importance does not lie in treating them as proof of an external reality, but in showing that the boundary between external perception, memory, expectation and internal experience is more complex than a rigid separation between wakefulness and sleep would suggest.<\/p>\r\n\r\n      <p>A third phenomenon is oneiric metaconsciousness. In some dreams, the person does not fully control the dream and does not wake from it, yet maintains a form of reflective observation. The person may recognise what is happening, evaluate it or contemplate it from within the experience. This possibility is especially relevant because it shows that consciousness during sleep cannot always be reduced to passivity or confusion. There may be experience, narrative and a limited but real form of self-reference.<\/p>\r\n\r\n<h2>A hypothesis about consciousness during sleep<\/h2>\r\n\r\n<p>These phenomena do not prove that consciousness exists independently of the brain. They show that the relationship between brain activity and subjective experience is still not fully understood. From a clinical and neuroscientific point of view, cortical activation alone does not always explain the clarity, coherence and organisation of the experience reported afterwards.<\/p>\r\n\r\n<p>From this perspective, the brain can be understood as a generator of experience and as a system that regulates, filters and organises conscious content. The evidence is not enough to present this as a final conclusion. It does support a wider clinical and neuroscientific question. During sleep, consciousness appears to change form. It remains linked to brain function, although current models of activation, connectivity and cortical organisation still leave part of the experience unexplained.<\/p>\r\n\r\n<p>The task is to study consciousness beyond ordinary waking life. If the brain can generate coherent internal experience during sleep, support reflective awareness in lucid dreaming and produce perceptions at the threshold between sleep and wakefulness, consciousness also needs to be studied as a form of internal organisation that changes with the neurophysiological state.<\/p>\r\n\r\n<h2>Contemplative traditions and internal observation<\/h2>\r\n\r\n<p>This hypothesis also helps explain why liminal states have been studied in contemplative traditions. Theravada Buddhism, authors from the Rhenish mystical tradition and practices of inner observation have described changes in consciousness related to sleep, dreaming, attention and the relationship with the body for centuries. Their language is not the language of neuroscience and cannot replace experimental research. Even so, these traditions contain detailed descriptions of subjective experience that may be valuable when read critically and without confusing internal observation with scientific proof.<\/p>\r\n\r\n<p>Daniel Ingram, physician and contemporary practitioner, has tried to translate part of this contemplative knowledge into a language that can be understood by people with a scientific background. His work does not solve the problem of consciousness. It shows that some internal states have been observed with a level of detail that modern research should not dismiss too quickly.<\/p>\r\n\r\n<h2>One of neuroscience's decisive frontiers<\/h2>\r\n\r\n<p>Sleep is an ordinary biological state, but it remains one of the most open areas in the study of consciousness. Neuroscience can describe many of its mechanisms, but it still cannot fully explain how those mechanisms become lived experience. This is one of the major questions for the coming years: how consciousness emerges, how it changes with the state of the nervous system and what forms it takes when the brain withdraws from the external world and begins to organise an internal reality.<\/p>\r\n\r\n<p>Keeping this question open is part of scientific work. What we do not yet know should not be filled with premature claims. It should not be dismissed either simply because it does not fit current models. Consciousness during sleep suggests that the brain does more than process information. It also organises experience, and that distinction remains one of the unresolved problems in neuroscience.<\/p>\r\n<\/div>\r\n\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-ca\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Cada nit, durant unes quantes hores, la consci\u00e8ncia deixa de dependre principalment del m\u00f3n exterior i entra en una forma d'organitzaci\u00f3 interna que encara no entenem del tot. Dormir no \u00e9s simplement deixar d'estar despert. Durant el son, el cervell modifica el seu patr\u00f3 d'activitat, regula funcions fisiol\u00f2giques essencials, reorganitza mem\u00f2ria i emoci\u00f3, i al mateix temps pot generar experi\u00e8ncies subjectives amb narrativa, intensitat afectiva, sensaci\u00f3 de pres\u00e8ncia i, en alguns casos, capacitat de reflexi\u00f3.<\/p>\r\n\r\n        <p>El somni no \u00e9s una imatge observada des de fora. Mentre somiem, l'experi\u00e8ncia \u00e9s viscuda des de dins. El subjecte respon, interpreta, sent, tem, decideix o accepta una l\u00f2gica interna que nom\u00e9s despr\u00e9s, en despertar, pot semblar incoherent. Durant el somni, aquella experi\u00e8ncia t\u00e9 realitat fenomenol\u00f2gica. Aquesta realitat no dep\u00e8n del contacte ordinari amb l'entorn, per\u00f2 tampoc pot separar-se simplement del cervell. Precisament per aix\u00f2 el son \u00e9s un camp privilegiat per estudiar la consci\u00e8ncia.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>El que la neuroci\u00e8ncia del son ja ha establert<\/h2>\r\n\r\n      <p>La neuroci\u00e8ncia del son ha avan\u00e7at molt en les darreres d\u00e8cades. Avui es poden descriure amb precisi\u00f3 el son NREM i el son REM, registrar patrons el\u00e8ctrics, identificar canvis neuroqu\u00edmics i observar l'activitat de regions implicades en la regulaci\u00f3 del son i en la formaci\u00f3 del somni, com el tronc cerebral, el t\u00e0lem, l'hipot\u00e0lem i l'hipocamp. Tamb\u00e9 sabem que el son participa en processos com la consolidaci\u00f3 de la mem\u00f2ria, la regulaci\u00f3 emocional, la reorganitzaci\u00f3 sin\u00e0ptica i l'eliminaci\u00f3 metab\u00f2lica cerebral vinculada al sistema glimf\u00e0tic.<\/p>\r\n\r\n      <p>Aquest coneixement \u00e9s fonamental, per\u00f2 no resol el problema principal. Descriure l'arquitectura del son no equival a explicar com aquesta arquitectura es converteix en experi\u00e8ncia conscient. Podem observar fases, ritmes, xarxes i estructures. El que continua sent dif\u00edcil \u00e9s entendre com aquests processos arriben a constituir una escena viscuda, una emoci\u00f3 sentida, una pres\u00e8ncia reconeguda o una consci\u00e8ncia que, dins del mateix somni, pot arribar a saber que est\u00e0 somiant.<\/p>\r\n\r\n      <h2>On el model cl\u00e0ssic troba els seus l\u00edmits<\/h2>\r\n\r\n      <p>El somni l\u00facid n'\u00e9s un exemple clar. En aquests episodis, la persona reconeix que est\u00e0 somiant mentre el somni continua. Els estudis d'Ursula Voss, Martin Dresler i altres investigadors han mostrat que el somni l\u00facid pot presentar un estat h\u00edbrid, amb caracter\u00edstiques del son REM i de la vig\u00edlia, inclosa activitat en regions prefrontals relacionades amb autoreflexi\u00f3 i control executiu. Aix\u00f2 no encaixa b\u00e9 amb una concepci\u00f3 massa simple del son com a reducci\u00f3 global de l'activitat cerebral.<\/p>\r\n\r\n      <p>Les experi\u00e8ncies hipnag\u00f2giques i hipnop\u00f2mpiques tamb\u00e9 obliguen a matisar aquesta visi\u00f3. En el pas entre vig\u00edlia i son, o entre son i despertar, poden emergir veus, imatges, figures o sensacions de pres\u00e8ncia. Aquestes experi\u00e8ncies no s\u00f3n necess\u00e0riament patol\u00f2giques i s'han descrit en persones sanes. El seu inter\u00e8s no \u00e9s convertir-les en proves d'una realitat externa, sin\u00f3 mostrar que la frontera entre percepci\u00f3 externa, mem\u00f2ria, expectativa i experi\u00e8ncia interna \u00e9s m\u00e9s complexa del que suggereix una separaci\u00f3 r\u00edgida entre estar despert i estar adormit.<\/p>\r\n\r\n      <p>El tercer fenomen \u00e9s la metaconsci\u00e8ncia on\u00edrica. En alguns somnis, la persona no controla del tot el somni ni es desperta, per\u00f2 mant\u00e9 una forma d'observaci\u00f3 reflexiva. Pot recon\u00e8ixer el que passa, avaluar-ho o contemplar-ho des de dins de l'experi\u00e8ncia. Aquesta possibilitat \u00e9s especialment rellevant perqu\u00e8 mostra que durant el son poden apar\u00e8ixer graus de consci\u00e8ncia que no s\u00f3n simplement passivitat ni confusi\u00f3. Hi pot haver experi\u00e8ncia, narrativa i una forma limitada per\u00f2 real d'autorefer\u00e8ncia.<\/p>\r\n\r\n      <h2>Una hip\u00f2tesi sobre la consci\u00e8ncia durant el son<\/h2>\r\n\r\n      <p>Aquests fen\u00f2mens no demostren que la consci\u00e8ncia existeixi independentment del cervell. El que mostren \u00e9s una cosa m\u00e9s precisa i m\u00e9s important des del punt de vista neurocient\u00edfic. La relaci\u00f3 entre activitat neuronal i experi\u00e8ncia subjectiva encara no est\u00e0 completament explicada. El nivell d'activaci\u00f3 cortical, per si sol, no sempre permet entendre la qualitat, l'organitzaci\u00f3 i la claredat de l'experi\u00e8ncia relatada.<\/p>\r\n\r\n      <p>La q\u00fcesti\u00f3, per tant, no \u00e9s abandonar la neuroci\u00e8ncia, sin\u00f3 ampliar la pregunta. Si el cervell pot generar una experi\u00e8ncia interna coherent durant el son, si pot sostenir formes de reflexivitat en el somni l\u00facid i si pot produir percepcions en els llindars entre son i vig\u00edlia, aleshores la consci\u00e8ncia no pot estudiar-se nom\u00e9s com un estat propi de la vig\u00edlia ordin\u00e0ria. Cal estudiar-la tamb\u00e9 com una capacitat d'organitzaci\u00f3 interna que canvia segons l'estat neurofisiol\u00f2gic.<\/p>\r\n\r\n      <p>Des d'aquesta perspectiva, el cervell pot entendre's com a generador d'experi\u00e8ncia, per\u00f2 tamb\u00e9 com a regulador, filtre i organitzador del contingut conscient. Aquesta formulaci\u00f3 no tanca el debat. Tampoc afirma m\u00e9s del que sabem. Permet, per\u00f2, treballar amb una hip\u00f2tesi m\u00e9s rica. Durant el son, la consci\u00e8ncia no desapareix, sin\u00f3 que pot reorganitzar-se en formes que depenen del cervell per\u00f2 que encara no sabem descriure nom\u00e9s amb els models actuals d'activaci\u00f3, connectivitat i funci\u00f3 cortical.<\/p>\r\n\r\n      <h2>Tradicions contemplatives i observaci\u00f3 interna<\/h2>\r\n\r\n      <p>Aquesta hip\u00f2tesi tamb\u00e9 ajuda a entendre per qu\u00e8 alguns estats lim\u00edtrofs han interessat tant a les tradicions contemplatives. El budisme Theravada, alguns autors de la m\u00edstica renana i pr\u00e0ctiques d'observaci\u00f3 interna han descrit durant segles canvis en la consci\u00e8ncia vinculats al son, al somni, a l'atenci\u00f3 i a la relaci\u00f3 amb el cos. El seu llenguatge no \u00e9s el de la neuroci\u00e8ncia i no pot substituir la recerca experimental. Tanmateix, aquests marcs conserven descripcions fines de l'experi\u00e8ncia subjectiva que poden tenir valor quan es llegeixen amb criteri i sense confondre observaci\u00f3 interna amb demostraci\u00f3 cient\u00edfica.<\/p>\r\n\r\n      <p>Daniel Ingram, metge i practicant contemporani, ha intentat traslladar part d'aquest coneixement contemplatiu a un llenguatge accessible per a persones amb formaci\u00f3 cient\u00edfica. La seva aportaci\u00f3 no consisteix a resoldre el problema de la consci\u00e8ncia, sin\u00f3 a mostrar que alguns estats interns han estat observats amb una precisi\u00f3 que la investigaci\u00f3 moderna no hauria de descartar de manera autom\u00e0tica.<\/p>\r\n\r\n      <h2>Una de les fronteres decisives de la neuroci\u00e8ncia<\/h2>\r\n\r\n      <p>El son continua sent un fenomen quotidi\u00e0 i, alhora, profundament obert. La neuroci\u00e8ncia pot descriure moltes de les seves estructures, per\u00f2 encara no pot explicar del tot com aquestes estructures es converteixen en experi\u00e8ncia viscuda. En aquest espai se situa una de les preguntes m\u00e9s importants per als pr\u00f2xims anys: com emergeix la consci\u00e8ncia, com canvia segons l'estat del sistema nervi\u00f3s i quines formes adopta quan el cervell deixa d'orientar-se cap al m\u00f3n exterior i comen\u00e7a a organitzar una realitat interna.<\/p>\r\n\r\n      <p>Mantenir aquesta pregunta oberta \u00e9s una exig\u00e8ncia cient\u00edfica, no una concessi\u00f3 a la creen\u00e7a. El que encara no sabem no s'ha d'omplir amb afirmacions precipitades, per\u00f2 tampoc s'ha de descartar nom\u00e9s perqu\u00e8 no encaixa dins del model actual. La consci\u00e8ncia durant el son mostra que el cervell no nom\u00e9s processa informaci\u00f3. Tamb\u00e9 organitza experi\u00e8ncia, i \u00e9s en aquesta difer\u00e8ncia on la neuroci\u00e8ncia encara t\u00e9 un dels seus problemes no resolts.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-es\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Cada noche, durante varias horas, la conciencia deja de depender principalmente del mundo exterior y entra en una forma de organizaci\u00f3n interna que todav\u00eda no comprendemos del todo. Dormir no es simplemente dejar de estar despierto. Durante el sue\u00f1o, el cerebro modifica sus patrones de actividad, regula funciones fisiol\u00f3gicas esenciales, reorganiza memoria y emoci\u00f3n, y al mismo tiempo puede generar experiencias subjetivas con estructura narrativa, intensidad afectiva, sensaci\u00f3n de presencia y, en algunos casos, capacidad reflexiva.<\/p>\r\n\r\n        <p>El sue\u00f1o no es una imagen observada desde fuera. Mientras so\u00f1amos, la experiencia se vive desde dentro. El sujeto responde, interpreta, siente, teme, decide o acepta una l\u00f3gica interna que solo despu\u00e9s, al despertar, puede parecer incoherente. Durante el sue\u00f1o, esa experiencia tiene realidad fenomenol\u00f3gica. No depende del contacto ordinario con el entorno, pero tampoco puede separarse simplemente del cerebro. Precisamente por eso el sue\u00f1o es un campo privilegiado para estudiar la conciencia.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>Lo que la neurociencia del sue\u00f1o ya ha establecido<\/h2>\r\n\r\n      <p>La neurociencia del sue\u00f1o ha avanzado mucho en las \u00faltimas d\u00e9cadas. Hoy es posible describir con precisi\u00f3n el sue\u00f1o NREM y el sue\u00f1o REM, registrar patrones el\u00e9ctricos, identificar cambios neuroqu\u00edmicos y observar la actividad de regiones implicadas en la regulaci\u00f3n del sue\u00f1o y en la formaci\u00f3n del contenido on\u00edrico, como el tronco encef\u00e1lico, el t\u00e1lamo, el hipot\u00e1lamo y el hipocampo. Tambi\u00e9n sabemos que el sue\u00f1o participa en procesos como la consolidaci\u00f3n de la memoria, la regulaci\u00f3n emocional, la reorganizaci\u00f3n sin\u00e1ptica y la eliminaci\u00f3n metab\u00f3lica cerebral vinculada al sistema glinf\u00e1tico.<\/p>\r\n\r\n      <p>Este conocimiento es fundamental, pero no resuelve el problema principal. Describir la arquitectura del sue\u00f1o no equivale a explicar c\u00f3mo esa arquitectura se convierte en experiencia consciente. Podemos observar fases, ritmos, redes y estructuras. Lo que sigue siendo dif\u00edcil es entender c\u00f3mo esos procesos llegan a constituir una escena vivida, una emoci\u00f3n sentida, una presencia reconocida o una conciencia que, dentro del propio sue\u00f1o, puede llegar a saber que est\u00e1 so\u00f1ando.<\/p>\r\n\r\n      <h2>Donde el modelo cl\u00e1sico encuentra sus l\u00edmites<\/h2>\r\n\r\n      <p>El sue\u00f1o l\u00facido es un ejemplo claro. En estos episodios, la persona reconoce que est\u00e1 so\u00f1ando mientras el sue\u00f1o contin\u00faa. Los estudios de Ursula Voss, Martin Dresler y otros investigadores han mostrado que el sue\u00f1o l\u00facido puede presentar un estado h\u00edbrido, con caracter\u00edsticas del sue\u00f1o REM y de la vigilia, incluida actividad en regiones prefrontales relacionadas con la autorreflexi\u00f3n y el control ejecutivo. Esto no encaja bien con una concepci\u00f3n demasiado simple del sue\u00f1o como reducci\u00f3n global de la actividad cerebral.<\/p>\r\n\r\n      <p>Las experiencias hipnag\u00f3gicas e hipnop\u00f3mpicas tambi\u00e9n obligan a matizar esta visi\u00f3n. En el paso entre vigilia y sue\u00f1o, o entre sue\u00f1o y despertar, pueden surgir voces, im\u00e1genes, figuras o sensaciones de presencia. Estas experiencias no son necesariamente patol\u00f3gicas y se han descrito en personas sanas. Su inter\u00e9s no consiste en convertirlas en pruebas de una realidad externa, sino en mostrar que la frontera entre percepci\u00f3n externa, memoria, expectativa y experiencia interna es m\u00e1s compleja de lo que sugiere una separaci\u00f3n r\u00edgida entre estar despierto y estar dormido.<\/p>\r\n\r\n      <p>El tercer fen\u00f3meno es la metaconciencia on\u00edrica. En algunos sue\u00f1os, la persona no controla del todo el sue\u00f1o ni despierta, pero mantiene una forma de observaci\u00f3n reflexiva. Puede reconocer lo que ocurre, evaluarlo o contemplarlo desde dentro de la experiencia. Esta posibilidad es especialmente relevante porque muestra que durante el sue\u00f1o pueden aparecer grados de conciencia que no son simplemente pasividad ni confusi\u00f3n. Puede haber experiencia, narrativa y una forma limitada pero real de autorreferencia.<\/p>\r\n\r\n      <h2>Una hip\u00f3tesis sobre la conciencia durante el sue\u00f1o<\/h2>\r\n\r\n      <p>Estos fen\u00f3menos no demuestran que la conciencia exista independientemente del cerebro. Lo que muestran es algo m\u00e1s preciso y m\u00e1s importante desde el punto de vista neurocient\u00edfico. La relaci\u00f3n entre actividad neuronal y experiencia subjetiva todav\u00eda no est\u00e1 completamente explicada. El nivel de activaci\u00f3n cortical, por s\u00ed solo, no siempre permite comprender la calidad, la organizaci\u00f3n y la claridad de la experiencia relatada.<\/p>\r\n\r\n      <p>La cuesti\u00f3n, por tanto, no es abandonar la neurociencia, sino ampliar la pregunta. Si el cerebro puede generar una experiencia interna coherente durante el sue\u00f1o, si puede sostener formas de reflexividad en el sue\u00f1o l\u00facido y si puede producir percepciones en los umbrales entre sue\u00f1o y vigilia, entonces la conciencia no puede estudiarse solo como un estado propio de la vigilia ordinaria. Tambi\u00e9n debe estudiarse como una capacidad de organizaci\u00f3n interna que cambia seg\u00fan el estado neurofisiol\u00f3gico.<\/p>\r\n\r\n      <p>Desde esta perspectiva, el cerebro puede entenderse como generador de experiencia, pero tambi\u00e9n como regulador, filtro y organizador del contenido consciente. Esta formulaci\u00f3n no cierra el debate. Tampoco afirma m\u00e1s de lo que sabemos. Permite, sin embargo, trabajar con una hip\u00f3tesis m\u00e1s rica. Durante el sue\u00f1o, la conciencia no desaparece, sino que puede reorganizarse en formas que dependen del cerebro pero que todav\u00eda no sabemos describir solo con los modelos actuales de activaci\u00f3n, conectividad y funci\u00f3n cortical.<\/p>\r\n\r\n      <h2>Tradiciones contemplativas y observaci\u00f3n interna<\/h2>\r\n\r\n      <p>Esta hip\u00f3tesis tambi\u00e9n ayuda a entender por qu\u00e9 algunos estados lim\u00edtrofes han interesado tanto a las tradiciones contemplativas. El budismo Theravada, algunos autores de la m\u00edstica renana y las pr\u00e1cticas de observaci\u00f3n interna han descrito durante siglos cambios en la conciencia vinculados al sue\u00f1o, al so\u00f1ar, a la atenci\u00f3n y a la relaci\u00f3n con el cuerpo. Su lenguaje no es el de la neurociencia y no puede sustituir a la investigaci\u00f3n experimental. Sin embargo, estos marcos conservan descripciones finas de la experiencia subjetiva que pueden tener valor cuando se leen con criterio y sin confundir observaci\u00f3n interna con demostraci\u00f3n cient\u00edfica.<\/p>\r\n\r\n      <p>Daniel Ingram, m\u00e9dico y practicante contempor\u00e1neo, ha intentado trasladar parte de este conocimiento contemplativo a un lenguaje accesible para personas con formaci\u00f3n cient\u00edfica. Su aportaci\u00f3n no consiste en resolver el problema de la conciencia, sino en mostrar que algunos estados internos han sido observados con una precisi\u00f3n que la investigaci\u00f3n moderna no deber\u00eda descartar de manera autom\u00e1tica.<\/p>\r\n\r\n      <h2>Una de las fronteras decisivas de la neurociencia<\/h2>\r\n\r\n      <p>El sue\u00f1o sigue siendo un fen\u00f3meno cotidiano y, al mismo tiempo, profundamente abierto. La neurociencia puede describir muchas de sus estructuras, pero todav\u00eda no puede explicar del todo c\u00f3mo esas estructuras se convierten en experiencia vivida. En este espacio se sit\u00faa una de las preguntas m\u00e1s importantes para los pr\u00f3ximos a\u00f1os: c\u00f3mo emerge la conciencia, c\u00f3mo cambia seg\u00fan el estado del sistema nervioso y qu\u00e9 formas adopta cuando el cerebro deja de orientarse hacia el mundo exterior y empieza a organizar una realidad interna.<\/p>\r\n\r\n      <p>Mantener esta pregunta abierta es una exigencia cient\u00edfica, no una concesi\u00f3n a la creencia. Lo que todav\u00eda no sabemos no debe llenarse con afirmaciones precipitadas, pero tampoco debe descartarse solo porque no encaja dentro del modelo actual. La conciencia durante el sue\u00f1o muestra que el cerebro no solo procesa informaci\u00f3n. Tambi\u00e9n organiza experiencia, y es en esa diferencia donde la neurociencia todav\u00eda tiene uno de sus problemas no resueltos.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-de\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Jede Nacht l\u00f6st sich das Bewusstsein f\u00fcr mehrere Stunden von seiner gew\u00f6hnlichen Ausrichtung auf die \u00e4u\u00dfere Welt und tritt in eine Form innerer Organisation ein, die wir bis heute nicht vollst\u00e4ndig verstehen. Schlaf bedeutet nicht einfach, nicht wach zu sein. W\u00e4hrend des Schlafs ver\u00e4ndert das Gehirn seine Aktivit\u00e4tsmuster, reguliert wesentliche physiologische Funktionen, ordnet Ged\u00e4chtnis und Emotion neu und kann gleichzeitig subjektive Erfahrungen hervorbringen, die eine narrative Struktur, affektive Intensit\u00e4t, ein Gef\u00fchl von Pr\u00e4senz und in manchen F\u00e4llen auch reflexive Anteile enthalten.<\/p>\r\n\r\n        <p>Ein Traum ist kein Bild, das von au\u00dfen betrachtet wird. W\u00e4hrend wir tr\u00e4umen, wird die Erfahrung von innen her erlebt. Das Subjekt reagiert, deutet, f\u00fchlt, f\u00fcrchtet, entscheidet oder folgt einer inneren Logik, die erst nach dem Erwachen unzusammenh\u00e4ngend erscheinen mag. W\u00e4hrend des Traums besitzt diese Erfahrung ph\u00e4nomenologische Wirklichkeit. Sie h\u00e4ngt nicht vom gew\u00f6hnlichen Kontakt mit der Umgebung ab, l\u00e4sst sich aber auch nicht einfach vom Gehirn trennen. Genau deshalb ist der Schlaf ein besonders aufschlussreiches Feld f\u00fcr die Erforschung des Bewusstseins.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>Was die Neurowissenschaft des Schlafs bereits gesichert hat<\/h2>\r\n\r\n      <p>Die Neurowissenschaft des Schlafs hat in den letzten Jahrzehnten erhebliche Fortschritte gemacht. NREM- und REM-Schlaf lassen sich heute pr\u00e4zise beschreiben, elektrische Muster k\u00f6nnen aufgezeichnet, neurochemische Ver\u00e4nderungen identifiziert und die Aktivit\u00e4t von Regionen untersucht werden, die an der Schlafregulation und an der Traumbildung beteiligt sind, darunter Hirnstamm, Thalamus, Hypothalamus und Hippocampus. Ebenso ist bekannt, dass Schlaf an Prozessen wie Ged\u00e4chtniskonsolidierung, emotionaler Regulation, synaptischer Reorganisation und metabolischer Reinigung im Zusammenhang mit dem glymphatischen System beteiligt ist.<\/p>\r\n\r\n      <p>Dieses Wissen ist grundlegend, l\u00f6st aber das zentrale Problem nicht. Die Architektur des Schlafs zu beschreiben ist nicht dasselbe wie zu erkl\u00e4ren, wie diese Architektur zu bewusster Erfahrung wird. Wir k\u00f6nnen Phasen, Rhythmen, Netzwerke und Strukturen beobachten. Schwieriger bleibt zu verstehen, wie diese Prozesse eine erlebte Szene, eine gef\u00fchlte Emotion, eine erkannte Pr\u00e4senz oder ein Bewusstsein hervorbringen, das innerhalb des Traums sogar wissen kann, dass es tr\u00e4umt.<\/p>\r\n\r\n      <h2>Wo das klassische Modell an seine Grenzen st\u00f6\u00dft<\/h2>\r\n\r\n      <p>Luzides Tr\u00e4umen ist ein klares Beispiel. In solchen Episoden erkennt die Person, dass sie tr\u00e4umt, w\u00e4hrend der Traum weiterl\u00e4uft. Studien von Ursula Voss, Martin Dresler und anderen Forschenden haben gezeigt, dass luzides Tr\u00e4umen einen hybriden Zustand aufweisen kann, mit Merkmalen des REM-Schlafs und des Wachseins, einschlie\u00dflich Aktivit\u00e4t in pr\u00e4frontalen Regionen, die mit Selbstreflexion und exekutiver Kontrolle verbunden sind. Das passt nicht zu einer zu einfachen Vorstellung von Schlaf als globaler Reduktion der Gehirnaktivit\u00e4t.<\/p>\r\n\r\n      <p>Auch hypnagoge und hypnopompe Erfahrungen zwingen zu einer differenzierteren Betrachtung. Beim \u00dcbergang vom Wachsein in den Schlaf oder vom Schlaf ins Erwachen k\u00f6nnen Stimmen, Bilder, Gestalten oder Pr\u00e4senzempfindungen auftreten. Diese Erfahrungen sind nicht notwendigerweise pathologisch und wurden auch bei gesunden Menschen beschrieben. Ihr Interesse liegt nicht darin, sie als Beweise f\u00fcr eine \u00e4u\u00dfere Realit\u00e4t zu behandeln, sondern darin zu zeigen, dass die Grenze zwischen \u00e4u\u00dferer Wahrnehmung, Ged\u00e4chtnis, Erwartung und innerer Erfahrung komplexer ist, als eine starre Trennung zwischen Wachsein und Schlaf nahelegt.<\/p>\r\n\r\n      <p>Ein drittes Ph\u00e4nomen ist die oneirische Metabewusstheit. In manchen Tr\u00e4umen kontrolliert die Person den Traum nicht vollst\u00e4ndig und wacht auch nicht auf, beh\u00e4lt jedoch eine Form reflektierender Beobachtung. Sie kann erkennen, was geschieht, es bewerten oder aus der Erfahrung heraus betrachten. Diese M\u00f6glichkeit ist besonders relevant, weil sie zeigt, dass im Schlaf Bewusstseinsgrade auftreten k\u00f6nnen, die nicht einfach Passivit\u00e4t oder Verwirrung sind. Es kann Erfahrung, narrative Struktur und eine begrenzte, aber reale Form von Selbstbezug geben.<\/p>\r\n\r\n      <h2>Eine Hypothese \u00fcber Bewusstsein im Schlaf<\/h2>\r\n\r\n      <p>Diese Ph\u00e4nomene beweisen nicht, dass Bewusstsein unabh\u00e4ngig vom Gehirn existiert. Sie zeigen aus neurowissenschaftlicher Sicht etwas Pr\u00e4ziseres und Wichtigeres. Die Beziehung zwischen neuronaler Aktivit\u00e4t und subjektiver Erfahrung ist noch nicht vollst\u00e4ndig erkl\u00e4rt. Das Ausma\u00df kortikaler Aktivierung allein reicht nicht immer aus, um die Qualit\u00e4t, Organisation und Klarheit der berichteten Erfahrung zu verstehen.<\/p>\r\n\r\n      <p>Die Aufgabe besteht daher nicht darin, die Neurowissenschaft aufzugeben, sondern die Fragestellung zu erweitern. Wenn das Gehirn w\u00e4hrend des Schlafs koh\u00e4rente innere Erfahrung erzeugen kann, wenn es im luziden Traum Formen von Reflexivit\u00e4t aufrechterhalten kann und wenn es an den Schwellen zwischen Schlaf und Wachsein Wahrnehmungen hervorbringt, dann kann Bewusstsein nicht ausschlie\u00dflich als Zustand des gew\u00f6hnlichen Wachseins untersucht werden. Es muss auch als F\u00e4higkeit innerer Organisation untersucht werden, die sich je nach neurophysiologischem Zustand ver\u00e4ndert.<\/p>\r\n\r\n      <p>Aus dieser Perspektive kann das Gehirn als Erzeuger von Erfahrung verstanden werden, aber auch als Regulator, Filter und Organisator bewusster Inhalte. Diese Formulierung schlie\u00dft die Debatte nicht ab. Sie behauptet auch nicht mehr, als wir wissen. Sie erlaubt jedoch, mit einer reicheren Hypothese zu arbeiten. W\u00e4hrend des Schlafs verschwindet Bewusstsein nicht, sondern kann sich in Formen reorganisieren, die vom Gehirn abh\u00e4ngen, die wir aber mit den heutigen Modellen von Aktivierung, Konnektivit\u00e4t und kortikaler Funktion noch nicht vollst\u00e4ndig beschreiben k\u00f6nnen.<\/p>\r\n\r\n      <h2>Kontemplative Traditionen und innere Beobachtung<\/h2>\r\n\r\n      <p>Diese Hypothese hilft auch zu verstehen, warum Grenzzust\u00e4nde f\u00fcr kontemplative Traditionen seit Langem von Interesse sind. Der Theravada-Buddhismus, einige Autoren der rheinischen Mystik und Praktiken innerer Beobachtung haben \u00fcber Jahrhunderte Ver\u00e4nderungen des Bewusstseins beschrieben, die mit Schlaf, Traum, Aufmerksamkeit und der Beziehung zum K\u00f6rper verbunden sind. Ihre Sprache ist nicht die Sprache der Neurowissenschaft und kann experimentelle Forschung nicht ersetzen. Dennoch bewahren diese Rahmen feine Beschreibungen subjektiver Erfahrung, die einen Wert haben k\u00f6nnen, wenn sie kritisch gelesen werden und ohne innere Beobachtung mit wissenschaftlichem Nachweis zu verwechseln.<\/p>\r\n\r\n      <p>Daniel Ingram, Arzt und zeitgen\u00f6ssischer Praktiker, hat versucht, einen Teil dieses kontemplativen Wissens in eine Sprache zu \u00fcbertragen, die f\u00fcr Menschen mit wissenschaftlichem Hintergrund zug\u00e4nglich ist. Sein Beitrag besteht nicht darin, das Problem des Bewusstseins zu l\u00f6sen, sondern darin zu zeigen, dass bestimmte innere Zust\u00e4nde mit einer Genauigkeit beobachtet wurden, die moderne Forschung nicht automatisch verwerfen sollte.<\/p>\r\n\r\n      <h2>Eine der entscheidenden Grenzen der Neurowissenschaft<\/h2>\r\n\r\n      <p>Schlaf bleibt ein allt\u00e4gliches und zugleich tief offenes Ph\u00e4nomen. Die Neurowissenschaft kann viele seiner Strukturen beschreiben, aber noch nicht vollst\u00e4ndig erkl\u00e4ren, wie diese Strukturen zu gelebter Erfahrung werden. In diesem Raum liegt eine der wichtigsten Fragen der kommenden Jahre: wie Bewusstsein entsteht, wie es sich je nach Zustand des Nervensystems ver\u00e4ndert und welche Formen es annimmt, wenn das Gehirn sich von der \u00e4u\u00dferen Welt abwendet und beginnt, eine innere Realit\u00e4t zu organisieren.<\/p>\r\n\r\n      <p>Diese Frage offen zu halten ist eine wissenschaftliche Notwendigkeit, kein Zugest\u00e4ndnis an Glauben. Was wir noch nicht wissen, sollte nicht mit vorschnellen Behauptungen gef\u00fcllt werden, aber es sollte auch nicht verworfen werden, nur weil es au\u00dferhalb des aktuellen Modells liegt. Bewusstsein im Schlaf zeigt, dass das Gehirn nicht nur Information verarbeitet. Es organisiert auch Erfahrung, und in diesem Unterschied liegt eines der ungel\u00f6sten Probleme der Neurowissenschaft.<\/p>\r\n    <\/div>\r\n\r\n  <\/article>\r\n\r\n  <div class=\"hlsleep-footer\">\r\n    \u00a9 Health & Life | Science and Consciousness\r\n  <\/div>\r\n\r\n<\/div>[\/et_pb_code][\/et_pb_column][\/et_pb_row][\/et_pb_section]\n","protected":false},"excerpt":{"rendered":"<!-- Health & Life | Brain Activity and Consciousness During Sleep -->\r\n<!-- Premium editorial HTML | EN default | DE | ES | CA -->\r\n<!-- Paste into a Divi Text module (HTML mode) -->\r\n\r\n<style>\r\n  .hlsleep-premium {\r\n    max-width: 100%;\r\n    margin: 0 auto;\r\n    padding: 42px 24px 58px;\r\n    font-family: inherit;\r\n    color: #302f2b;\r\n    background: transparent;\r\n  }\r\n\r\n  .hlsleep-lang {\r\n    display: none !important;\r\n  }\r\n\r\n  .hlsleep-lang-en {\r\n    display: block !important;\r\n  }\r\n\r\n  .hlsleep-inline {\r\n    display: none !important;\r\n  }\r\n\r\n  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}\r\n\r\n  html[lang^=\"es\"] .hlsleep-svg-text,\r\n  body.translatepress-es .hlsleep-svg-text,\r\n  body.trp-language-es .hlsleep-svg-text {\r\n    display: none !important;\r\n  }\r\n\r\n  html[lang^=\"es\"] .hlsleep-svg-text-es,\r\n  body.translatepress-es .hlsleep-svg-text-es,\r\n  body.trp-language-es .hlsleep-svg-text-es {\r\n    display: inline !important;\r\n  }\r\n\r\n  html[lang^=\"ca\"] .hlsleep-lang,\r\n  body.translatepress-ca .hlsleep-lang,\r\n  body.trp-language-ca .hlsleep-lang {\r\n    display: none !important;\r\n  }\r\n\r\n  html[lang^=\"ca\"] .hlsleep-lang-ca,\r\n  body.translatepress-ca .hlsleep-lang-ca,\r\n  body.trp-language-ca .hlsleep-lang-ca {\r\n    display: block !important;\r\n  }\r\n\r\n  html[lang^=\"ca\"] .hlsleep-inline,\r\n  body.translatepress-ca .hlsleep-inline,\r\n  body.trp-language-ca .hlsleep-inline {\r\n    display: none !important;\r\n  }\r\n\r\n  html[lang^=\"ca\"] .hlsleep-inline-ca,\r\n  body.translatepress-ca .hlsleep-inline-ca,\r\n  body.trp-language-ca .hlsleep-inline-ca {\r\n    display: inline !important;\r\n  }\r\n\r\n  html[lang^=\"ca\"] .hlsleep-svg-text,\r\n  body.translatepress-ca .hlsleep-svg-text,\r\n  body.trp-language-ca .hlsleep-svg-text {\r\n    display: none !important;\r\n  }\r\n\r\n  html[lang^=\"ca\"] .hlsleep-svg-text-ca,\r\n  body.translatepress-ca .hlsleep-svg-text-ca,\r\n  body.trp-language-ca .hlsleep-svg-text-ca {\r\n    display: inline !important;\r\n  }\r\n\r\n  .hlsleep-hero {\r\n    max-width: 840px;\r\n    margin: 0 auto 34px;\r\n    text-align: center;\r\n  }\r\n\r\n  .hlsleep-kicker {\r\n    margin: 0 0 12px;\r\n    font-size: 0.78rem;\r\n    letter-spacing: 0.14em;\r\n    text-transform: uppercase;\r\n    color: #8a8178;\r\n  }\r\n\r\n  .hlsleep-title {\r\n    margin: 0;\r\n    font-size: clamp(2.25rem, 4.7vw, 4rem);\r\n    line-height: 1.06;\r\n    letter-spacing: -0.035em;\r\n    color: #26364a;\r\n    font-weight: 600;\r\n  }\r\n\r\n  .hlsleep-subtitle {\r\n    max-width: 720px;\r\n    margin: 18px auto 0;\r\n    font-size: clamp(1.05rem, 1.7vw, 1.25rem);\r\n    line-height: 1.62;\r\n    color: #69645d;\r\n    font-weight: 400;\r\n  }\r\n\r\n  .hlsleep-byline {\r\n    margin: 14px 0 0;\r\n    font-size: 0.94rem;\r\n    color: #817a72;\r\n    font-style: italic;\r\n  }\r\n\r\n  .hlsleep-visual-card {\r\n    max-width: 100%;\r\n    margin: 38px auto 42px;\r\n    padding: 24px 24px 20px;\r\n    border-radius: 30px;\r\n    background:\r\n      radial-gradient(circle at 18% 12%, rgba(221, 141, 89, 0.16), transparent 24%),\r\n      radial-gradient(circle at 84% 18%, rgba(80, 120, 162, 0.14), transparent 26%),\r\n      linear-gradient(180deg, #fffdf8 0%, #f8f9fb 100%);\r\n    border: 1px solid rgba(55, 67, 82, 0.09);\r\n    box-shadow: 0 22px 54px rgba(40, 48, 62, 0.07);\r\n  }\r\n\r\n  .hlsleep-visual-heading {\r\n    margin: 0 0 18px;\r\n    text-align: center;\r\n    font-size: 0.82rem;\r\n    letter-spacing: 0.12em;\r\n    text-transform: uppercase;\r\n    color: #8a837b;\r\n  }\r\n\r\n  .hlsleep-visual svg {\r\n    width: 100%;\r\n    height: auto;\r\n    display: block;\r\n    margin: 0 auto;\r\n  }\r\n\r\n  .hlsleep-caption {\r\n    max-width: 760px;\r\n    margin: 16px auto 0;\r\n    text-align: center;\r\n    font-size: 0.98rem;\r\n    line-height: 1.72;\r\n    color: #64615b;\r\n  }\r\n\r\n  .hlsleep-article {\r\n    max-width: 840px;\r\n    margin: 0 auto;\r\n  }\r\n\r\n  .hlsleep-article p {\r\n    margin: 0 0 19px;\r\n    font-size: 1.06rem;\r\n    line-height: 1.92;\r\n    color: #3c3b37;\r\n  }\r\n\r\n  .hlsleep-article h2 {\r\n    margin: 38px 0 15px;\r\n    font-size: 1.42rem;\r\n    line-height: 1.32;\r\n    color: #26364a;\r\n    font-weight: 600;\r\n    letter-spacing: -0.01em;\r\n  }\r\n\r\n  .hlsleep-article .hlsleep-intro p:first-child::first-letter {\r\n    float: left;\r\n    font-size: 4.2rem;\r\n    line-height: 0.82;\r\n    padding: 10px 10px 0 0;\r\n    color: #8d5538;\r\n    font-weight: 500;\r\n  }\r\n\r\n  .hlsleep-rule {\r\n    width: 78px;\r\n    height: 1px;\r\n    background: rgba(67, 72, 78, 0.22);\r\n    margin: 34px auto;\r\n  }\r\n\r\n  .hlsleep-footer {\r\n    max-width: 840px;\r\n    margin: 34px auto 0;\r\n    padding-top: 18px;\r\n    border-top: 1px solid rgba(55, 67, 82, 0.12);\r\n    text-align: center;\r\n    font-size: 0.9rem;\r\n    color: #6f675f;\r\n    line-height: 1.6;\r\n  }\r\n\r\n  @media (max-width: 720px) {\r\n    .hlsleep-premium {\r\n      padding: 30px 18px 48px;\r\n    }\r\n\r\n    .hlsleep-visual-card {\r\n      padding: 20px 16px 16px;\r\n      border-radius: 22px;\r\n      margin: 30px auto 36px;\r\n    }\r\n\r\n    .hlsleep-article p {\r\n      font-size: 1rem;\r\n      line-height: 1.84;\r\n    }\r\n\r\n    .hlsleep-article h2 {\r\n      font-size: 1.26rem;\r\n      margin-top: 32px;\r\n    }\r\n\r\n    .hlsleep-article .hlsleep-intro p:first-child::first-letter {\r\n      font-size: 3.3rem;\r\n      padding: 8px 8px 0 0;\r\n    }\r\n  }\r\n<\/style>\r\n\r\n<div class=\"hlsleep-premium\">\r\n\r\n  <header class=\"hlsleep-hero\">\r\n    <div class=\"hlsleep-lang hlsleep-lang-en\">\r\n      <p class=\"hlsleep-kicker\">Neuroscience and consciousness<\/p>\r\n      <h1 class=\"hlsleep-title\">Brain Activity and Consciousness During Sleep<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Current knowledge, emerging hypotheses and the limits of explanation<\/p>\r\n      <p class=\"hlsleep-byline\">By Olga Hom<\/p>\r\n    <\/div>\r\n    <div class=\"hlsleep-lang hlsleep-lang-de\">\r\n      <p class=\"hlsleep-kicker\">Neurowissenschaft und Bewusstsein<\/p>\r\n      <h1 class=\"hlsleep-title\">Gehirnaktivit\u00e4t und Bewusstsein im Schlaf<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Aktueller Wissensstand, entstehende Hypothesen und Grenzen der Erkl\u00e4rung<\/p>\r\n      <p class=\"hlsleep-byline\">Von Olga Hom<\/p>\r\n    <\/div>\r\n    <div class=\"hlsleep-lang hlsleep-lang-es\">\r\n      <p class=\"hlsleep-kicker\">Neurociencia y conciencia<\/p>\r\n      <h1 class=\"hlsleep-title\">Actividad cerebral y conciencia durante el sue\u00f1o<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Conocimiento actual, hip\u00f3tesis emergentes y l\u00edmites de la explicaci\u00f3n<\/p>\r\n      <p class=\"hlsleep-byline\">Por Olga Hom<\/p>\r\n    <\/div>\r\n    <div class=\"hlsleep-lang hlsleep-lang-ca\">\r\n      <p class=\"hlsleep-kicker\">Neuroci\u00e8ncia i consci\u00e8ncia<\/p>\r\n      <h1 class=\"hlsleep-title\">Activitat cerebral i consci\u00e8ncia durant el son<\/h1>\r\n      <p class=\"hlsleep-subtitle\">Coneixement actual, hip\u00f2tesis emergents i l\u00edmits de l'explicaci\u00f3<\/p>\r\n      <p class=\"hlsleep-byline\">Per Olga Hom<\/p>\r\n    <\/div>\r\n  <\/header>\r\n\r\n  <section class=\"hlsleep-visual-card\">\r\n    <p class=\"hlsleep-visual-heading\">\r\n      <span class=\"hlsleep-inline hlsleep-inline-en\">A visual map of nocturnal consciousness<\/span>\r\n      <span class=\"hlsleep-inline hlsleep-inline-de\">Eine visuelle Karte n\u00e4chtlichen Bewusstseins<\/span>\r\n      <span class=\"hlsleep-inline hlsleep-inline-es\">Un mapa visual de la conciencia nocturna<\/span>\r\n      <span class=\"hlsleep-inline hlsleep-inline-ca\">Un mapa visual de la consci\u00e8ncia nocturna<\/span>\r\n    <\/p>\r\n\r\n    <div class=\"hlsleep-visual\">\r\n      <svg viewBox=\"0 0 920 500\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" role=\"img\" aria-label=\"Visual map of consciousness during sleep\">\r\n        <defs>\r\n          <linearGradient id=\"hlSleepNight\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"1\">\r\n            <stop offset=\"0%\" stop-color=\"#f8f2e6\"\/>\r\n            <stop offset=\"48%\" stop-color=\"#dce8f2\"\/>\r\n            <stop offset=\"100%\" stop-color=\"#234d78\"\/>\r\n          <\/linearGradient>\r\n          <linearGradient id=\"hlSleepPath\" x1=\"0\" y1=\"0\" x2=\"1\" y2=\"0\">\r\n            <stop offset=\"0%\" stop-color=\"#c47a4f\"\/>\r\n            <stop offset=\"42%\" stop-color=\"#779ec4\"\/>\r\n            <stop offset=\"100%\" stop-color=\"#244d78\"\/>\r\n          <\/linearGradient>\r\n          <filter id=\"hlSleepSoftShadow\" x=\"-20%\" y=\"-20%\" width=\"140%\" height=\"140%\">\r\n            <feDropShadow dx=\"0\" dy=\"14\" stdDeviation=\"16\" flood-color=\"#1f2e3f\" flood-opacity=\"0.12\"\/>\r\n          <\/filter>\r\n        <\/defs>\r\n        <rect x=\"0\" y=\"0\" width=\"920\" height=\"500\" fill=\"none\"\/>\r\n        <g filter=\"url(#hlSleepSoftShadow)\">\r\n          <path d=\"M120 76 C212 28, 348 40, 438 120 C520 193, 514 304, 444 378 C372 455, 242 455, 158 386 C68 312, 34 166, 120 76 Z\" fill=\"#ffffff\"\/>\r\n          <path d=\"M136 92 C222 50, 338 60, 414 132 C486 200, 480 298, 420 360 C356 426, 248 426, 176 368 C96 304, 66 164, 136 92 Z\" fill=\"url(#hlSleepNight)\" opacity=\"0.92\"\/>\r\n        <\/g>\r\n        <path d=\"M134 324 C202 260, 260 250, 314 278 C370 306, 410 286, 448 232\" fill=\"none\" stroke=\"#ffffff\" stroke-width=\"6\" opacity=\"0.65\" stroke-linecap=\"round\"\/>\r\n        <path d=\"M134 324 C202 260, 260 250, 314 278 C370 306, 410 286, 448 232\" fill=\"none\" stroke=\"url(#hlSleepPath)\" stroke-width=\"2.4\" opacity=\"0.95\" stroke-linecap=\"round\"\/>\r\n        <circle cx=\"148\" cy=\"320\" r=\"9\" fill=\"#c47a4f\"\/>\r\n        <circle cx=\"238\" cy=\"262\" r=\"9\" fill=\"#d7e2ef\"\/>\r\n        <circle cx=\"318\" cy=\"278\" r=\"9\" fill=\"#9db9d5\"\/>\r\n        <circle cx=\"394\" cy=\"272\" r=\"9\" fill=\"#5f8dbb\"\/>\r\n        <circle cx=\"448\" cy=\"232\" r=\"9\" fill=\"#244d78\"\/>\r\n        <circle cx=\"154\" cy=\"104\" r=\"22\" fill=\"#f3e7c9\"\/>\r\n        <circle cx=\"166\" cy=\"96\" r=\"22\" fill=\"#f8f2e6\"\/>\r\n        <path d=\"M186 142 C232 112, 298 112, 346 148\" fill=\"none\" stroke=\"#ffffff\" stroke-width=\"2\" opacity=\"0.42\"\/>\r\n        <path d=\"M154 190 C230 150, 350 162, 426 214\" fill=\"none\" stroke=\"#ffffff\" stroke-width=\"2\" opacity=\"0.38\"\/>\r\n        <path d=\"M138 246 C224 210, 348 224, 444 300\" fill=\"none\" stroke=\"#ffffff\" stroke-width=\"2\" opacity=\"0.34\"\/>\r\n        <text x=\"108\" y=\"366\" font-size=\"13\" fill=\"#6c5544\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">wakefulness<\/text>\r\n        <text x=\"108\" y=\"366\" font-size=\"13\" fill=\"#6c5544\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">Wachzustand<\/text>\r\n        <text x=\"108\" y=\"366\" font-size=\"13\" fill=\"#6c5544\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">vigilia<\/text>\r\n        <text x=\"108\" y=\"366\" font-size=\"13\" fill=\"#6c5544\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">vig\u00edlia<\/text>\r\n        <text x=\"204\" y=\"242\" font-size=\"13\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">sleep architecture<\/text>\r\n        <text x=\"204\" y=\"242\" font-size=\"13\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">Schlafarchitektur<\/text>\r\n        <text x=\"204\" y=\"242\" font-size=\"13\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">arquitectura del sue\u00f1o<\/text>\r\n        <text x=\"204\" y=\"242\" font-size=\"13\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">arquitectura del son<\/text>\r\n        <text x=\"296\" y=\"318\" font-size=\"13\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">lucid dreaming<\/text>\r\n        <text x=\"296\" y=\"318\" font-size=\"13\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">luzider Traum<\/text>\r\n        <text x=\"296\" y=\"318\" font-size=\"13\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">sue\u00f1o l\u00facido<\/text>\r\n        <text x=\"296\" y=\"318\" font-size=\"13\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">somni l\u00facid<\/text>\r\n        <text x=\"404\" y=\"302\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">dream awareness<\/text>\r\n        <text x=\"404\" y=\"302\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">Traumbewusstheit<\/text>\r\n        <text x=\"404\" y=\"302\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">conciencia on\u00edrica<\/text>\r\n        <text x=\"404\" y=\"302\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">consci\u00e8ncia on\u00edrica<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">open question<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">offene Frage<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">cuesti\u00f3n abierta<\/text>\r\n        <text x=\"432\" y=\"206\" font-size=\"13\" fill=\"#203b57\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">q\u00fcesti\u00f3 oberta<\/text>\r\n        <g transform=\"translate(535,74)\">\r\n          <rect x=\"0\" y=\"0\" width=\"314\" height=\"340\" rx=\"26\" fill=\"#ffffff\" stroke=\"#dde1e7\" stroke-width=\"1\"\/>\r\n          <line x1=\"38\" y1=\"72\" x2=\"38\" y2=\"272\" stroke=\"#d1d8e0\" stroke-width=\"1.2\"\/>\r\n          <circle cx=\"38\" cy=\"72\" r=\"6\" fill=\"#c47a4f\"\/>\r\n          <circle cx=\"38\" cy=\"122\" r=\"6\" fill=\"#d7e2ef\"\/>\r\n          <circle cx=\"38\" cy=\"172\" r=\"6\" fill=\"#9db9d5\"\/>\r\n          <circle cx=\"38\" cy=\"222\" r=\"6\" fill=\"#5f8dbb\"\/>\r\n          <circle cx=\"38\" cy=\"272\" r=\"6\" fill=\"#244d78\"\/>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">ordinary perception<\/text>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">gew\u00f6hnliche Wahrnehmung<\/text>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">percepci\u00f3n ordinaria<\/text>\r\n          <text x=\"62\" y=\"77\" font-size=\"15\" fill=\"#5f5a53\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">percepci\u00f3 ordin\u00e0ria<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">NREM and REM patterns<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">NREM- und REM-Muster<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">patrones NREM y REM<\/text>\r\n          <text x=\"62\" y=\"127\" font-size=\"15\" fill=\"#3d5a76\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">patrons NREM i REM<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">mixed states<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">Mischzust\u00e4nde<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">estados mixtos<\/text>\r\n          <text x=\"62\" y=\"177\" font-size=\"15\" fill=\"#2b4e70\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">estats mixtos<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">inner observation<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">innere Beobachtung<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">observaci\u00f3n interna<\/text>\r\n          <text x=\"62\" y=\"227\" font-size=\"15\" fill=\"#244d78\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">observaci\u00f3 interna<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-en\">experience not yet fully explained<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-de\">noch nicht vollst\u00e4ndig erkl\u00e4rte Erfahrung<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-es\">experiencia a\u00fan no explicada del todo<\/text>\r\n          <text x=\"62\" y=\"277\" font-size=\"15\" fill=\"#1f3c5c\" font-family=\"inherit\" class=\"hlsleep-svg-text hlsleep-svg-text-ca\">experi\u00e8ncia encara no explicada del tot<\/text>\r\n        <\/g>\r\n      <\/svg>\r\n    <\/div>\r\n\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-en\">\r\n      Sleep is shown here as a changing field of brain states, thresholds and subjective experience, rather than as a single state of reduced activity.\r\n    <\/p>\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-de\">\r\n      Schlaf wird hier als ver\u00e4nderliches Feld aus Gehirnzust\u00e4nden, \u00dcberg\u00e4ngen und subjektivem Erleben dargestellt, nicht als ein einheitlicher Zustand verminderter Aktivit\u00e4t.\r\n    <\/p>\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-es\">\r\n      El sue\u00f1o se presenta aqu\u00ed como un campo cambiante de estados cerebrales, umbrales y experiencia subjetiva, no como un estado \u00fanico de actividad reducida.\r\n    <\/p>\r\n    <p class=\"hlsleep-caption hlsleep-lang hlsleep-lang-ca\">\r\n      El son es presenta aqu\u00ed com un camp canviant d'estats cerebrals, llindars i experi\u00e8ncia subjectiva, no com un estat \u00fanic d'activitat redu\u00efda.\r\n    <\/p>\r\n  <\/section>\r\n\r\n  <article class=\"hlsleep-article\">\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-en\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Every night, for several hours, consciousness shifts away from its ordinary dependence on the external world and enters a form of internal organisation that we still do not fully understand. Sleep is not simply the absence of wakefulness. During sleep, the brain changes its patterns of activity, regulates essential physiological functions, reorganises memory and emotion, and can at the same time generate subjective experiences with narrative structure, affective intensity, a sense of presence and, in some cases, reflective awareness.<\/p>\r\n\r\n        <p>A dream is not an image observed from the outside. While we dream, the experience is lived from within. The subject responds, interprets, feels, fears, decides or accepts an internal logic that may only appear incoherent after waking. During the dream itself, the experience has phenomenological reality. It does not depend on ordinary contact with the environment, yet it cannot simply be separated from the brain. This is precisely why sleep is such a privileged field for the study of consciousness.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>What sleep neuroscience has already established<\/h2>\r\n\r\n      <p>Sleep neuroscience has advanced considerably in recent decades. NREM and REM sleep can now be described with precision, electrical patterns can be recorded, neurochemical changes can be identified and the activity of regions involved in sleep regulation and dream formation can be studied, including the brainstem, thalamus, hypothalamus and hippocampus. Sleep is also known to participate in memory consolidation, emotional regulation, synaptic reorganisation and metabolic clearance processes associated with the glymphatic system.<\/p>\r\n\r\n      <p>This knowledge is essential, but it does not resolve the central problem. Describing the architecture of sleep is not the same as explaining how that architecture becomes conscious experience. We can observe phases, rhythms, networks and structures. What remains difficult is understanding how these processes come to constitute a lived scene, a felt emotion, a recognised presence or a form of awareness that, within the dream itself, may even know that it is dreaming.<\/p>\r\n\r\n      <h2>Where the classical model reaches its limits<\/h2>\r\n\r\n      <p>Lucid dreaming is one of the clearest examples. In these episodes, the person recognises that they are dreaming while the dream continues. Studies by Ursula Voss, Martin Dresler and other researchers have shown that lucid dreaming may involve a hybrid state, with characteristics of REM sleep and wakefulness, including activity in prefrontal regions associated with self-reflection and executive control. This does not fit comfortably with a simplified view of sleep as a global reduction of brain activity.<\/p>\r\n\r\n      <p>Hypnagogic and hypnopompic experiences also force us to refine this view. During the transition into sleep or out of sleep, people may experience voices, images, figures or a sense of presence. These experiences are not necessarily pathological and have been described in healthy individuals. Their importance does not lie in treating them as proof of an external reality, but in showing that the boundary between external perception, memory, expectation and internal experience is more complex than a rigid separation between wakefulness and sleep would suggest.<\/p>\r\n\r\n      <p>A third phenomenon is oneiric metaconsciousness. In some dreams, the person does not fully control the dream and does not wake from it, yet maintains a form of reflective observation. The person may recognise what is happening, evaluate it or contemplate it from within the experience. This possibility is especially relevant because it shows that consciousness during sleep cannot always be reduced to passivity or confusion. There may be experience, narrative and a limited but real form of self-reference.<\/p>\r\n\r\n<h2>A hypothesis about consciousness during sleep<\/h2>\r\n\r\n<p>These phenomena do not prove that consciousness exists independently of the brain. They show that the relationship between brain activity and subjective experience is still not fully understood. From a clinical and neuroscientific point of view, cortical activation alone does not always explain the clarity, coherence and organisation of the experience reported afterwards.<\/p>\r\n\r\n<p>From this perspective, the brain can be understood as a generator of experience and as a system that regulates, filters and organises conscious content. The evidence is not enough to present this as a final conclusion. It does support a wider clinical and neuroscientific question. During sleep, consciousness appears to change form. It remains linked to brain function, although current models of activation, connectivity and cortical organisation still leave part of the experience unexplained.<\/p>\r\n\r\n<p>The task is to study consciousness beyond ordinary waking life. If the brain can generate coherent internal experience during sleep, support reflective awareness in lucid dreaming and produce perceptions at the threshold between sleep and wakefulness, consciousness also needs to be studied as a form of internal organisation that changes with the neurophysiological state.<\/p>\r\n\r\n<h2>Contemplative traditions and internal observation<\/h2>\r\n\r\n<p>This hypothesis also helps explain why liminal states have been studied in contemplative traditions. Theravada Buddhism, authors from the Rhenish mystical tradition and practices of inner observation have described changes in consciousness related to sleep, dreaming, attention and the relationship with the body for centuries. Their language is not the language of neuroscience and cannot replace experimental research. Even so, these traditions contain detailed descriptions of subjective experience that may be valuable when read critically and without confusing internal observation with scientific proof.<\/p>\r\n\r\n<p>Daniel Ingram, physician and contemporary practitioner, has tried to translate part of this contemplative knowledge into a language that can be understood by people with a scientific background. His work does not solve the problem of consciousness. It shows that some internal states have been observed with a level of detail that modern research should not dismiss too quickly.<\/p>\r\n\r\n<h2>One of neuroscience's decisive frontiers<\/h2>\r\n\r\n<p>Sleep is an ordinary biological state, but it remains one of the most open areas in the study of consciousness. Neuroscience can describe many of its mechanisms, but it still cannot fully explain how those mechanisms become lived experience. This is one of the major questions for the coming years: how consciousness emerges, how it changes with the state of the nervous system and what forms it takes when the brain withdraws from the external world and begins to organise an internal reality.<\/p>\r\n\r\n<p>Keeping this question open is part of scientific work. What we do not yet know should not be filled with premature claims. It should not be dismissed either simply because it does not fit current models. Consciousness during sleep suggests that the brain does more than process information. It also organises experience, and that distinction remains one of the unresolved problems in neuroscience.<\/p>\r\n<\/div>\r\n\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-ca\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Cada nit, durant unes quantes hores, la consci\u00e8ncia deixa de dependre principalment del m\u00f3n exterior i entra en una forma d'organitzaci\u00f3 interna que encara no entenem del tot. Dormir no \u00e9s simplement deixar d'estar despert. Durant el son, el cervell modifica el seu patr\u00f3 d'activitat, regula funcions fisiol\u00f2giques essencials, reorganitza mem\u00f2ria i emoci\u00f3, i al mateix temps pot generar experi\u00e8ncies subjectives amb narrativa, intensitat afectiva, sensaci\u00f3 de pres\u00e8ncia i, en alguns casos, capacitat de reflexi\u00f3.<\/p>\r\n\r\n        <p>El somni no \u00e9s una imatge observada des de fora. Mentre somiem, l'experi\u00e8ncia \u00e9s viscuda des de dins. El subjecte respon, interpreta, sent, tem, decideix o accepta una l\u00f2gica interna que nom\u00e9s despr\u00e9s, en despertar, pot semblar incoherent. Durant el somni, aquella experi\u00e8ncia t\u00e9 realitat fenomenol\u00f2gica. Aquesta realitat no dep\u00e8n del contacte ordinari amb l'entorn, per\u00f2 tampoc pot separar-se simplement del cervell. Precisament per aix\u00f2 el son \u00e9s un camp privilegiat per estudiar la consci\u00e8ncia.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>El que la neuroci\u00e8ncia del son ja ha establert<\/h2>\r\n\r\n      <p>La neuroci\u00e8ncia del son ha avan\u00e7at molt en les darreres d\u00e8cades. Avui es poden descriure amb precisi\u00f3 el son NREM i el son REM, registrar patrons el\u00e8ctrics, identificar canvis neuroqu\u00edmics i observar l'activitat de regions implicades en la regulaci\u00f3 del son i en la formaci\u00f3 del somni, com el tronc cerebral, el t\u00e0lem, l'hipot\u00e0lem i l'hipocamp. Tamb\u00e9 sabem que el son participa en processos com la consolidaci\u00f3 de la mem\u00f2ria, la regulaci\u00f3 emocional, la reorganitzaci\u00f3 sin\u00e0ptica i l'eliminaci\u00f3 metab\u00f2lica cerebral vinculada al sistema glimf\u00e0tic.<\/p>\r\n\r\n      <p>Aquest coneixement \u00e9s fonamental, per\u00f2 no resol el problema principal. Descriure l'arquitectura del son no equival a explicar com aquesta arquitectura es converteix en experi\u00e8ncia conscient. Podem observar fases, ritmes, xarxes i estructures. El que continua sent dif\u00edcil \u00e9s entendre com aquests processos arriben a constituir una escena viscuda, una emoci\u00f3 sentida, una pres\u00e8ncia reconeguda o una consci\u00e8ncia que, dins del mateix somni, pot arribar a saber que est\u00e0 somiant.<\/p>\r\n\r\n      <h2>On el model cl\u00e0ssic troba els seus l\u00edmits<\/h2>\r\n\r\n      <p>El somni l\u00facid n'\u00e9s un exemple clar. En aquests episodis, la persona reconeix que est\u00e0 somiant mentre el somni continua. Els estudis d'Ursula Voss, Martin Dresler i altres investigadors han mostrat que el somni l\u00facid pot presentar un estat h\u00edbrid, amb caracter\u00edstiques del son REM i de la vig\u00edlia, inclosa activitat en regions prefrontals relacionades amb autoreflexi\u00f3 i control executiu. Aix\u00f2 no encaixa b\u00e9 amb una concepci\u00f3 massa simple del son com a reducci\u00f3 global de l'activitat cerebral.<\/p>\r\n\r\n      <p>Les experi\u00e8ncies hipnag\u00f2giques i hipnop\u00f2mpiques tamb\u00e9 obliguen a matisar aquesta visi\u00f3. En el pas entre vig\u00edlia i son, o entre son i despertar, poden emergir veus, imatges, figures o sensacions de pres\u00e8ncia. Aquestes experi\u00e8ncies no s\u00f3n necess\u00e0riament patol\u00f2giques i s'han descrit en persones sanes. El seu inter\u00e8s no \u00e9s convertir-les en proves d'una realitat externa, sin\u00f3 mostrar que la frontera entre percepci\u00f3 externa, mem\u00f2ria, expectativa i experi\u00e8ncia interna \u00e9s m\u00e9s complexa del que suggereix una separaci\u00f3 r\u00edgida entre estar despert i estar adormit.<\/p>\r\n\r\n      <p>El tercer fenomen \u00e9s la metaconsci\u00e8ncia on\u00edrica. En alguns somnis, la persona no controla del tot el somni ni es desperta, per\u00f2 mant\u00e9 una forma d'observaci\u00f3 reflexiva. Pot recon\u00e8ixer el que passa, avaluar-ho o contemplar-ho des de dins de l'experi\u00e8ncia. Aquesta possibilitat \u00e9s especialment rellevant perqu\u00e8 mostra que durant el son poden apar\u00e8ixer graus de consci\u00e8ncia que no s\u00f3n simplement passivitat ni confusi\u00f3. Hi pot haver experi\u00e8ncia, narrativa i una forma limitada per\u00f2 real d'autorefer\u00e8ncia.<\/p>\r\n\r\n      <h2>Una hip\u00f2tesi sobre la consci\u00e8ncia durant el son<\/h2>\r\n\r\n      <p>Aquests fen\u00f2mens no demostren que la consci\u00e8ncia existeixi independentment del cervell. El que mostren \u00e9s una cosa m\u00e9s precisa i m\u00e9s important des del punt de vista neurocient\u00edfic. La relaci\u00f3 entre activitat neuronal i experi\u00e8ncia subjectiva encara no est\u00e0 completament explicada. El nivell d'activaci\u00f3 cortical, per si sol, no sempre permet entendre la qualitat, l'organitzaci\u00f3 i la claredat de l'experi\u00e8ncia relatada.<\/p>\r\n\r\n      <p>La q\u00fcesti\u00f3, per tant, no \u00e9s abandonar la neuroci\u00e8ncia, sin\u00f3 ampliar la pregunta. Si el cervell pot generar una experi\u00e8ncia interna coherent durant el son, si pot sostenir formes de reflexivitat en el somni l\u00facid i si pot produir percepcions en els llindars entre son i vig\u00edlia, aleshores la consci\u00e8ncia no pot estudiar-se nom\u00e9s com un estat propi de la vig\u00edlia ordin\u00e0ria. Cal estudiar-la tamb\u00e9 com una capacitat d'organitzaci\u00f3 interna que canvia segons l'estat neurofisiol\u00f2gic.<\/p>\r\n\r\n      <p>Des d'aquesta perspectiva, el cervell pot entendre's com a generador d'experi\u00e8ncia, per\u00f2 tamb\u00e9 com a regulador, filtre i organitzador del contingut conscient. Aquesta formulaci\u00f3 no tanca el debat. Tampoc afirma m\u00e9s del que sabem. Permet, per\u00f2, treballar amb una hip\u00f2tesi m\u00e9s rica. Durant el son, la consci\u00e8ncia no desapareix, sin\u00f3 que pot reorganitzar-se en formes que depenen del cervell per\u00f2 que encara no sabem descriure nom\u00e9s amb els models actuals d'activaci\u00f3, connectivitat i funci\u00f3 cortical.<\/p>\r\n\r\n      <h2>Tradicions contemplatives i observaci\u00f3 interna<\/h2>\r\n\r\n      <p>Aquesta hip\u00f2tesi tamb\u00e9 ajuda a entendre per qu\u00e8 alguns estats lim\u00edtrofs han interessat tant a les tradicions contemplatives. El budisme Theravada, alguns autors de la m\u00edstica renana i pr\u00e0ctiques d'observaci\u00f3 interna han descrit durant segles canvis en la consci\u00e8ncia vinculats al son, al somni, a l'atenci\u00f3 i a la relaci\u00f3 amb el cos. El seu llenguatge no \u00e9s el de la neuroci\u00e8ncia i no pot substituir la recerca experimental. Tanmateix, aquests marcs conserven descripcions fines de l'experi\u00e8ncia subjectiva que poden tenir valor quan es llegeixen amb criteri i sense confondre observaci\u00f3 interna amb demostraci\u00f3 cient\u00edfica.<\/p>\r\n\r\n      <p>Daniel Ingram, metge i practicant contemporani, ha intentat traslladar part d'aquest coneixement contemplatiu a un llenguatge accessible per a persones amb formaci\u00f3 cient\u00edfica. La seva aportaci\u00f3 no consisteix a resoldre el problema de la consci\u00e8ncia, sin\u00f3 a mostrar que alguns estats interns han estat observats amb una precisi\u00f3 que la investigaci\u00f3 moderna no hauria de descartar de manera autom\u00e0tica.<\/p>\r\n\r\n      <h2>Una de les fronteres decisives de la neuroci\u00e8ncia<\/h2>\r\n\r\n      <p>El son continua sent un fenomen quotidi\u00e0 i, alhora, profundament obert. La neuroci\u00e8ncia pot descriure moltes de les seves estructures, per\u00f2 encara no pot explicar del tot com aquestes estructures es converteixen en experi\u00e8ncia viscuda. En aquest espai se situa una de les preguntes m\u00e9s importants per als pr\u00f2xims anys: com emergeix la consci\u00e8ncia, com canvia segons l'estat del sistema nervi\u00f3s i quines formes adopta quan el cervell deixa d'orientar-se cap al m\u00f3n exterior i comen\u00e7a a organitzar una realitat interna.<\/p>\r\n\r\n      <p>Mantenir aquesta pregunta oberta \u00e9s una exig\u00e8ncia cient\u00edfica, no una concessi\u00f3 a la creen\u00e7a. El que encara no sabem no s'ha d'omplir amb afirmacions precipitades, per\u00f2 tampoc s'ha de descartar nom\u00e9s perqu\u00e8 no encaixa dins del model actual. La consci\u00e8ncia durant el son mostra que el cervell no nom\u00e9s processa informaci\u00f3. Tamb\u00e9 organitza experi\u00e8ncia, i \u00e9s en aquesta difer\u00e8ncia on la neuroci\u00e8ncia encara t\u00e9 un dels seus problemes no resolts.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-es\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Cada noche, durante varias horas, la conciencia deja de depender principalmente del mundo exterior y entra en una forma de organizaci\u00f3n interna que todav\u00eda no comprendemos del todo. Dormir no es simplemente dejar de estar despierto. Durante el sue\u00f1o, el cerebro modifica sus patrones de actividad, regula funciones fisiol\u00f3gicas esenciales, reorganiza memoria y emoci\u00f3n, y al mismo tiempo puede generar experiencias subjetivas con estructura narrativa, intensidad afectiva, sensaci\u00f3n de presencia y, en algunos casos, capacidad reflexiva.<\/p>\r\n\r\n        <p>El sue\u00f1o no es una imagen observada desde fuera. Mientras so\u00f1amos, la experiencia se vive desde dentro. El sujeto responde, interpreta, siente, teme, decide o acepta una l\u00f3gica interna que solo despu\u00e9s, al despertar, puede parecer incoherente. Durante el sue\u00f1o, esa experiencia tiene realidad fenomenol\u00f3gica. No depende del contacto ordinario con el entorno, pero tampoco puede separarse simplemente del cerebro. Precisamente por eso el sue\u00f1o es un campo privilegiado para estudiar la conciencia.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>Lo que la neurociencia del sue\u00f1o ya ha establecido<\/h2>\r\n\r\n      <p>La neurociencia del sue\u00f1o ha avanzado mucho en las \u00faltimas d\u00e9cadas. Hoy es posible describir con precisi\u00f3n el sue\u00f1o NREM y el sue\u00f1o REM, registrar patrones el\u00e9ctricos, identificar cambios neuroqu\u00edmicos y observar la actividad de regiones implicadas en la regulaci\u00f3n del sue\u00f1o y en la formaci\u00f3n del contenido on\u00edrico, como el tronco encef\u00e1lico, el t\u00e1lamo, el hipot\u00e1lamo y el hipocampo. Tambi\u00e9n sabemos que el sue\u00f1o participa en procesos como la consolidaci\u00f3n de la memoria, la regulaci\u00f3n emocional, la reorganizaci\u00f3n sin\u00e1ptica y la eliminaci\u00f3n metab\u00f3lica cerebral vinculada al sistema glinf\u00e1tico.<\/p>\r\n\r\n      <p>Este conocimiento es fundamental, pero no resuelve el problema principal. Describir la arquitectura del sue\u00f1o no equivale a explicar c\u00f3mo esa arquitectura se convierte en experiencia consciente. Podemos observar fases, ritmos, redes y estructuras. Lo que sigue siendo dif\u00edcil es entender c\u00f3mo esos procesos llegan a constituir una escena vivida, una emoci\u00f3n sentida, una presencia reconocida o una conciencia que, dentro del propio sue\u00f1o, puede llegar a saber que est\u00e1 so\u00f1ando.<\/p>\r\n\r\n      <h2>Donde el modelo cl\u00e1sico encuentra sus l\u00edmites<\/h2>\r\n\r\n      <p>El sue\u00f1o l\u00facido es un ejemplo claro. En estos episodios, la persona reconoce que est\u00e1 so\u00f1ando mientras el sue\u00f1o contin\u00faa. Los estudios de Ursula Voss, Martin Dresler y otros investigadores han mostrado que el sue\u00f1o l\u00facido puede presentar un estado h\u00edbrido, con caracter\u00edsticas del sue\u00f1o REM y de la vigilia, incluida actividad en regiones prefrontales relacionadas con la autorreflexi\u00f3n y el control ejecutivo. Esto no encaja bien con una concepci\u00f3n demasiado simple del sue\u00f1o como reducci\u00f3n global de la actividad cerebral.<\/p>\r\n\r\n      <p>Las experiencias hipnag\u00f3gicas e hipnop\u00f3mpicas tambi\u00e9n obligan a matizar esta visi\u00f3n. En el paso entre vigilia y sue\u00f1o, o entre sue\u00f1o y despertar, pueden surgir voces, im\u00e1genes, figuras o sensaciones de presencia. Estas experiencias no son necesariamente patol\u00f3gicas y se han descrito en personas sanas. Su inter\u00e9s no consiste en convertirlas en pruebas de una realidad externa, sino en mostrar que la frontera entre percepci\u00f3n externa, memoria, expectativa y experiencia interna es m\u00e1s compleja de lo que sugiere una separaci\u00f3n r\u00edgida entre estar despierto y estar dormido.<\/p>\r\n\r\n      <p>El tercer fen\u00f3meno es la metaconciencia on\u00edrica. En algunos sue\u00f1os, la persona no controla del todo el sue\u00f1o ni despierta, pero mantiene una forma de observaci\u00f3n reflexiva. Puede reconocer lo que ocurre, evaluarlo o contemplarlo desde dentro de la experiencia. Esta posibilidad es especialmente relevante porque muestra que durante el sue\u00f1o pueden aparecer grados de conciencia que no son simplemente pasividad ni confusi\u00f3n. Puede haber experiencia, narrativa y una forma limitada pero real de autorreferencia.<\/p>\r\n\r\n      <h2>Una hip\u00f3tesis sobre la conciencia durante el sue\u00f1o<\/h2>\r\n\r\n      <p>Estos fen\u00f3menos no demuestran que la conciencia exista independientemente del cerebro. Lo que muestran es algo m\u00e1s preciso y m\u00e1s importante desde el punto de vista neurocient\u00edfico. La relaci\u00f3n entre actividad neuronal y experiencia subjetiva todav\u00eda no est\u00e1 completamente explicada. El nivel de activaci\u00f3n cortical, por s\u00ed solo, no siempre permite comprender la calidad, la organizaci\u00f3n y la claridad de la experiencia relatada.<\/p>\r\n\r\n      <p>La cuesti\u00f3n, por tanto, no es abandonar la neurociencia, sino ampliar la pregunta. Si el cerebro puede generar una experiencia interna coherente durante el sue\u00f1o, si puede sostener formas de reflexividad en el sue\u00f1o l\u00facido y si puede producir percepciones en los umbrales entre sue\u00f1o y vigilia, entonces la conciencia no puede estudiarse solo como un estado propio de la vigilia ordinaria. Tambi\u00e9n debe estudiarse como una capacidad de organizaci\u00f3n interna que cambia seg\u00fan el estado neurofisiol\u00f3gico.<\/p>\r\n\r\n      <p>Desde esta perspectiva, el cerebro puede entenderse como generador de experiencia, pero tambi\u00e9n como regulador, filtro y organizador del contenido consciente. Esta formulaci\u00f3n no cierra el debate. Tampoco afirma m\u00e1s de lo que sabemos. Permite, sin embargo, trabajar con una hip\u00f3tesis m\u00e1s rica. Durante el sue\u00f1o, la conciencia no desaparece, sino que puede reorganizarse en formas que dependen del cerebro pero que todav\u00eda no sabemos describir solo con los modelos actuales de activaci\u00f3n, conectividad y funci\u00f3n cortical.<\/p>\r\n\r\n      <h2>Tradiciones contemplativas y observaci\u00f3n interna<\/h2>\r\n\r\n      <p>Esta hip\u00f3tesis tambi\u00e9n ayuda a entender por qu\u00e9 algunos estados lim\u00edtrofes han interesado tanto a las tradiciones contemplativas. El budismo Theravada, algunos autores de la m\u00edstica renana y las pr\u00e1cticas de observaci\u00f3n interna han descrito durante siglos cambios en la conciencia vinculados al sue\u00f1o, al so\u00f1ar, a la atenci\u00f3n y a la relaci\u00f3n con el cuerpo. Su lenguaje no es el de la neurociencia y no puede sustituir a la investigaci\u00f3n experimental. Sin embargo, estos marcos conservan descripciones finas de la experiencia subjetiva que pueden tener valor cuando se leen con criterio y sin confundir observaci\u00f3n interna con demostraci\u00f3n cient\u00edfica.<\/p>\r\n\r\n      <p>Daniel Ingram, m\u00e9dico y practicante contempor\u00e1neo, ha intentado trasladar parte de este conocimiento contemplativo a un lenguaje accesible para personas con formaci\u00f3n cient\u00edfica. Su aportaci\u00f3n no consiste en resolver el problema de la conciencia, sino en mostrar que algunos estados internos han sido observados con una precisi\u00f3n que la investigaci\u00f3n moderna no deber\u00eda descartar de manera autom\u00e1tica.<\/p>\r\n\r\n      <h2>Una de las fronteras decisivas de la neurociencia<\/h2>\r\n\r\n      <p>El sue\u00f1o sigue siendo un fen\u00f3meno cotidiano y, al mismo tiempo, profundamente abierto. La neurociencia puede describir muchas de sus estructuras, pero todav\u00eda no puede explicar del todo c\u00f3mo esas estructuras se convierten en experiencia vivida. En este espacio se sit\u00faa una de las preguntas m\u00e1s importantes para los pr\u00f3ximos a\u00f1os: c\u00f3mo emerge la conciencia, c\u00f3mo cambia seg\u00fan el estado del sistema nervioso y qu\u00e9 formas adopta cuando el cerebro deja de orientarse hacia el mundo exterior y empieza a organizar una realidad interna.<\/p>\r\n\r\n      <p>Mantener esta pregunta abierta es una exigencia cient\u00edfica, no una concesi\u00f3n a la creencia. Lo que todav\u00eda no sabemos no debe llenarse con afirmaciones precipitadas, pero tampoco debe descartarse solo porque no encaja dentro del modelo actual. La conciencia durante el sue\u00f1o muestra que el cerebro no solo procesa informaci\u00f3n. Tambi\u00e9n organiza experiencia, y es en esa diferencia donde la neurociencia todav\u00eda tiene uno de sus problemas no resueltos.<\/p>\r\n    <\/div>\r\n\r\n    <div class=\"hlsleep-lang hlsleep-lang-de\">\r\n      <div class=\"hlsleep-intro\">\r\n        <p>Jede Nacht l\u00f6st sich das Bewusstsein f\u00fcr mehrere Stunden von seiner gew\u00f6hnlichen Ausrichtung auf die \u00e4u\u00dfere Welt und tritt in eine Form innerer Organisation ein, die wir bis heute nicht vollst\u00e4ndig verstehen. Schlaf bedeutet nicht einfach, nicht wach zu sein. W\u00e4hrend des Schlafs ver\u00e4ndert das Gehirn seine Aktivit\u00e4tsmuster, reguliert wesentliche physiologische Funktionen, ordnet Ged\u00e4chtnis und Emotion neu und kann gleichzeitig subjektive Erfahrungen hervorbringen, die eine narrative Struktur, affektive Intensit\u00e4t, ein Gef\u00fchl von Pr\u00e4senz und in manchen F\u00e4llen auch reflexive Anteile enthalten.<\/p>\r\n\r\n        <p>Ein Traum ist kein Bild, das von au\u00dfen betrachtet wird. W\u00e4hrend wir tr\u00e4umen, wird die Erfahrung von innen her erlebt. Das Subjekt reagiert, deutet, f\u00fchlt, f\u00fcrchtet, entscheidet oder folgt einer inneren Logik, die erst nach dem Erwachen unzusammenh\u00e4ngend erscheinen mag. W\u00e4hrend des Traums besitzt diese Erfahrung ph\u00e4nomenologische Wirklichkeit. Sie h\u00e4ngt nicht vom gew\u00f6hnlichen Kontakt mit der Umgebung ab, l\u00e4sst sich aber auch nicht einfach vom Gehirn trennen. Genau deshalb ist der Schlaf ein besonders aufschlussreiches Feld f\u00fcr die Erforschung des Bewusstseins.<\/p>\r\n      <\/div>\r\n\r\n      <div class=\"hlsleep-rule\"><\/div>\r\n\r\n      <h2>Was die Neurowissenschaft des Schlafs bereits gesichert hat<\/h2>\r\n\r\n      <p>Die Neurowissenschaft des Schlafs hat in den letzten Jahrzehnten erhebliche Fortschritte gemacht. NREM- und REM-Schlaf lassen sich heute pr\u00e4zise beschreiben, elektrische Muster k\u00f6nnen aufgezeichnet, neurochemische Ver\u00e4nderungen identifiziert und die Aktivit\u00e4t von Regionen untersucht werden, die an der Schlafregulation und an der Traumbildung beteiligt sind, darunter Hirnstamm, Thalamus, Hypothalamus und Hippocampus. Ebenso ist bekannt, dass Schlaf an Prozessen wie Ged\u00e4chtniskonsolidierung, emotionaler Regulation, synaptischer Reorganisation und metabolischer Reinigung im Zusammenhang mit dem glymphatischen System beteiligt ist.<\/p>\r\n\r\n      <p>Dieses Wissen ist grundlegend, l\u00f6st aber das zentrale Problem nicht. Die Architektur des Schlafs zu beschreiben ist nicht dasselbe wie zu erkl\u00e4ren, wie diese Architektur zu bewusster Erfahrung wird. Wir k\u00f6nnen Phasen, Rhythmen, Netzwerke und Strukturen beobachten. Schwieriger bleibt zu verstehen, wie diese Prozesse eine erlebte Szene, eine gef\u00fchlte Emotion, eine erkannte Pr\u00e4senz oder ein Bewusstsein hervorbringen, das innerhalb des Traums sogar wissen kann, dass es tr\u00e4umt.<\/p>\r\n\r\n      <h2>Wo das klassische Modell an seine Grenzen st\u00f6\u00dft<\/h2>\r\n\r\n      <p>Luzides Tr\u00e4umen ist ein klares Beispiel. In solchen Episoden erkennt die Person, dass sie tr\u00e4umt, w\u00e4hrend der Traum weiterl\u00e4uft. Studien von Ursula Voss, Martin Dresler und anderen Forschenden haben gezeigt, dass luzides Tr\u00e4umen einen hybriden Zustand aufweisen kann, mit Merkmalen des REM-Schlafs und des Wachseins, einschlie\u00dflich Aktivit\u00e4t in pr\u00e4frontalen Regionen, die mit Selbstreflexion und exekutiver Kontrolle verbunden sind. Das passt nicht zu einer zu einfachen Vorstellung von Schlaf als globaler Reduktion der Gehirnaktivit\u00e4t.<\/p>\r\n\r\n      <p>Auch hypnagoge und hypnopompe Erfahrungen zwingen zu einer differenzierteren Betrachtung. Beim \u00dcbergang vom Wachsein in den Schlaf oder vom Schlaf ins Erwachen k\u00f6nnen Stimmen, Bilder, Gestalten oder Pr\u00e4senzempfindungen auftreten. Diese Erfahrungen sind nicht notwendigerweise pathologisch und wurden auch bei gesunden Menschen beschrieben. Ihr Interesse liegt nicht darin, sie als Beweise f\u00fcr eine \u00e4u\u00dfere Realit\u00e4t zu behandeln, sondern darin zu zeigen, dass die Grenze zwischen \u00e4u\u00dferer Wahrnehmung, Ged\u00e4chtnis, Erwartung und innerer Erfahrung komplexer ist, als eine starre Trennung zwischen Wachsein und Schlaf nahelegt.<\/p>\r\n\r\n      <p>Ein drittes Ph\u00e4nomen ist die oneirische Metabewusstheit. In manchen Tr\u00e4umen kontrolliert die Person den Traum nicht vollst\u00e4ndig und wacht auch nicht auf, beh\u00e4lt jedoch eine Form reflektierender Beobachtung. Sie kann erkennen, was geschieht, es bewerten oder aus der Erfahrung heraus betrachten. Diese M\u00f6glichkeit ist besonders relevant, weil sie zeigt, dass im Schlaf Bewusstseinsgrade auftreten k\u00f6nnen, die nicht einfach Passivit\u00e4t oder Verwirrung sind. Es kann Erfahrung, narrative Struktur und eine begrenzte, aber reale Form von Selbstbezug geben.<\/p>\r\n\r\n      <h2>Eine Hypothese \u00fcber Bewusstsein im Schlaf<\/h2>\r\n\r\n      <p>Diese Ph\u00e4nomene beweisen nicht, dass Bewusstsein unabh\u00e4ngig vom Gehirn existiert. Sie zeigen aus neurowissenschaftlicher Sicht etwas Pr\u00e4ziseres und Wichtigeres. Die Beziehung zwischen neuronaler Aktivit\u00e4t und subjektiver Erfahrung ist noch nicht vollst\u00e4ndig erkl\u00e4rt. Das Ausma\u00df kortikaler Aktivierung allein reicht nicht immer aus, um die Qualit\u00e4t, Organisation und Klarheit der berichteten Erfahrung zu verstehen.<\/p>\r\n\r\n      <p>Die Aufgabe besteht daher nicht darin, die Neurowissenschaft aufzugeben, sondern die Fragestellung zu erweitern. Wenn das Gehirn w\u00e4hrend des Schlafs koh\u00e4rente innere Erfahrung erzeugen kann, wenn es im luziden Traum Formen von Reflexivit\u00e4t aufrechterhalten kann und wenn es an den Schwellen zwischen Schlaf und Wachsein Wahrnehmungen hervorbringt, dann kann Bewusstsein nicht ausschlie\u00dflich als Zustand des gew\u00f6hnlichen Wachseins untersucht werden. Es muss auch als F\u00e4higkeit innerer Organisation untersucht werden, die sich je nach neurophysiologischem Zustand ver\u00e4ndert.<\/p>\r\n\r\n      <p>Aus dieser Perspektive kann das Gehirn als Erzeuger von Erfahrung verstanden werden, aber auch als Regulator, Filter und Organisator bewusster Inhalte. Diese Formulierung schlie\u00dft die Debatte nicht ab. Sie behauptet auch nicht mehr, als wir wissen. Sie erlaubt jedoch, mit einer reicheren Hypothese zu arbeiten. W\u00e4hrend des Schlafs verschwindet Bewusstsein nicht, sondern kann sich in Formen reorganisieren, die vom Gehirn abh\u00e4ngen, die wir aber mit den heutigen Modellen von Aktivierung, Konnektivit\u00e4t und kortikaler Funktion noch nicht vollst\u00e4ndig beschreiben k\u00f6nnen.<\/p>\r\n\r\n      <h2>Kontemplative Traditionen und innere Beobachtung<\/h2>\r\n\r\n      <p>Diese Hypothese hilft auch zu verstehen, warum Grenzzust\u00e4nde f\u00fcr kontemplative Traditionen seit Langem von Interesse sind. Der Theravada-Buddhismus, einige Autoren der rheinischen Mystik und Praktiken innerer Beobachtung haben \u00fcber Jahrhunderte Ver\u00e4nderungen des Bewusstseins beschrieben, die mit Schlaf, Traum, Aufmerksamkeit und der Beziehung zum K\u00f6rper verbunden sind. Ihre Sprache ist nicht die Sprache der Neurowissenschaft und kann experimentelle Forschung nicht ersetzen. Dennoch bewahren diese Rahmen feine Beschreibungen subjektiver Erfahrung, die einen Wert haben k\u00f6nnen, wenn sie kritisch gelesen werden und ohne innere Beobachtung mit wissenschaftlichem Nachweis zu verwechseln.<\/p>\r\n\r\n      <p>Daniel Ingram, Arzt und zeitgen\u00f6ssischer Praktiker, hat versucht, einen Teil dieses kontemplativen Wissens in eine Sprache zu \u00fcbertragen, die f\u00fcr Menschen mit wissenschaftlichem Hintergrund zug\u00e4nglich ist. Sein Beitrag besteht nicht darin, das Problem des Bewusstseins zu l\u00f6sen, sondern darin zu zeigen, dass bestimmte innere Zust\u00e4nde mit einer Genauigkeit beobachtet wurden, die moderne Forschung nicht automatisch verwerfen sollte.<\/p>\r\n\r\n      <h2>Eine der entscheidenden Grenzen der Neurowissenschaft<\/h2>\r\n\r\n      <p>Schlaf bleibt ein allt\u00e4gliches und zugleich tief offenes Ph\u00e4nomen. Die Neurowissenschaft kann viele seiner Strukturen beschreiben, aber noch nicht vollst\u00e4ndig erkl\u00e4ren, wie diese Strukturen zu gelebter Erfahrung werden. In diesem Raum liegt eine der wichtigsten Fragen der kommenden Jahre: wie Bewusstsein entsteht, wie es sich je nach Zustand des Nervensystems ver\u00e4ndert und welche Formen es annimmt, wenn das Gehirn sich von der \u00e4u\u00dferen Welt abwendet und beginnt, eine innere Realit\u00e4t zu organisieren.<\/p>\r\n\r\n      <p>Diese Frage offen zu halten ist eine wissenschaftliche Notwendigkeit, kein Zugest\u00e4ndnis an Glauben. Was wir noch nicht wissen, sollte nicht mit vorschnellen Behauptungen gef\u00fcllt werden, aber es sollte auch nicht verworfen werden, nur weil es au\u00dferhalb des aktuellen Modells liegt. Bewusstsein im Schlaf zeigt, dass das Gehirn nicht nur Information verarbeitet. Es organisiert auch Erfahrung, und in diesem Unterschied liegt eines der ungel\u00f6sten Probleme der Neurowissenschaft.<\/p>\r\n    <\/div>\r\n\r\n  <\/article>\r\n\r\n  <div class=\"hlsleep-footer\">\r\n    \u00a9 Health & Life | Science and Consciousness\r\n  <\/div>\r\n\r\n<\/div>\n","protected":false},"author":2,"featured_media":103742,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[23],"tags":[60,61,63,65,62,66,59,67,64],"class_list":["post-101320","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mind-psychology","tag-consciousness","tag-dreams","tag-lucid-dreaming","tag-mind-and-brain","tag-neuroscience","tag-non-ordinary-states","tag-sleep","tag-sleep-cognition","tag-subjective-experience"],"_links":{"self":[{"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/posts\/101320","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/comments?post=101320"}],"version-history":[{"count":21,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/posts\/101320\/revisions"}],"predecessor-version":[{"id":103743,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/posts\/101320\/revisions\/103743"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/media\/103742"}],"wp:attachment":[{"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/media?parent=101320"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/categories?post=101320"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/healthandlifeonline.com\/es\/wp-json\/wp\/v2\/tags?post=101320"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}