{"id":31146,"date":"2020-03-26T14:49:42","date_gmt":"2020-03-26T18:49:42","guid":{"rendered":"https:\/\/cifar661.wpengine.com\/?p=31146"},"modified":"2021-11-26T00:28:18","modified_gmt":"2021-11-26T05:28:18","slug":"finding-islands-in-the-uncharted-waters-of-consciousness","status":"publish","type":"post","link":"https:\/\/cifar.ca\/fr\/cifarnews\/2020\/03\/26\/finding-islands-in-the-uncharted-waters-of-consciousness\/","title":{"rendered":"\u00c0 la recherche d\u2019\u00eelots dans les eaux inexplor\u00e9es de la conscience"},"content":{"rendered":"<p><span class=\"highlight-text\">Les boursiers du CIFAR Tim Bayne, Anil Seth et Marcello Massimini posent la question suivante : la conscience peut-elle persister dans un cerveau qui est compl\u00e8tement coup\u00e9 du monde ext\u00e9rieur?<\/span><\/p>\n<p>Des progr\u00e8s r\u00e9cents en science et en g\u00e9nie ont permis de concr\u00e9tiser des sc\u00e9narios o\u00f9 du tissu c\u00e9r\u00e9bral vivant peut exister sans aucune connexion sensorielle avec le monde ext\u00e9rieur, et les boursiers du CIFAR<span style=\"color: #ff0000;\">\u00a0<a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/cifar.ca\/fr\/biographie\/tim-bayne\" target=\"_blank\" rel=\"noopener noreferrer\">Tim Bayne<\/a><\/span>,\u00a0<span style=\"color: #ff0000;\"><a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/cifar.ca\/fr\/biographie\/anil-k.-seth\" target=\"_blank\" rel=\"noopener noreferrer\">Anil Seth<\/a><\/span>\u00a0et\u00a0<a class=\"color-red\" href=\"https:\/\/cifar.ca\/fr\/biographie\/marcello-massimini\" target=\"_blank\" rel=\"noopener noreferrer\"><span style=\"color: #ff0000;\">Marcello Massimini<\/span><\/a>\u00a0du\u00a0<span style=\"color: #ff0000;\"><a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/cifar.ca\/fr\/recherche\/programme\/cerveau-esprit-et-conscience-azrieli\" target=\"_blank\" rel=\"noopener noreferrer\">programme\u00a0<\/a><a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/cifar.ca\/fr\/recherche\/programme\/cerveau-esprit-et-conscience-azrieli\" target=\"_blank\" rel=\"noopener noreferrer\">Cerveau, esprit et conscience Azrieli<\/a>\u00a0<\/span>se demandent si un tissu c\u00e9r\u00e9bral isol\u00e9 de la sorte peut soutenir la conscience, cr\u00e9ant ainsi des \u00ab \u00eelots de conscience \u00bb.<\/p>\n<p>Dans un article publi\u00e9 en janvier 2020 dans la revue\u00a0<span style=\"color: #ff0000;\"><em><a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/www.cell.com\/trends\/neurosciences\/fulltext\/S0166-2236(19)30216-4?\" target=\"_blank\" rel=\"noopener noreferrer\">Trends in Neuroscience<\/a><\/em>,<\/span> Bayne, Seth et Massimini examinent trois cas o\u00f9 ces \u00eelots de conscience pourraient exister :<\/p>\n<ul>\n<li>Cerveaux ex cranio : un cerveau est retir\u00e9 du corps et perfus\u00e9 avec des nutriments pour le maintenir en vie, comme dans le cas d\u2019un cerveau de porc qui a fait les manchettes<span style=\"color: #ff0000;\">\u00a0<a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/www.nature.com\/articles\/d41586-019-01216-4\" target=\"_blank\" rel=\"noopener noreferrer\">en 2019<\/a><\/span>;<\/li>\n<li>H\u00e9misph\u00e9rotomies : une partie du cerveau est d\u00e9connect\u00e9e de toutes les autres, mais elle est laiss\u00e9e en vie dans le cr\u00e2ne, un traitement de dernier recours dans les formes extr\u00eames d\u2019\u00e9pilepsie;<\/li>\n<li>Organo\u00efdes c\u00e9r\u00e9braux : des structures similaires \u00e0 un cerveau, cultiv\u00e9es en laboratoire, qui proviennent de cellules souches et qui sont utilis\u00e9es pour \u00e9tudier la physiologie du cerveau.<\/li>\n<\/ul>\n<figure style=\"width: 740px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cifar.ca\/images\/default-source\/news\/tim-anil-marcello.jpg?sfvrsn=73cc9be1_0\" alt=\"Tim+Anil+Marcello\" width=\"740\" height=\"340\" data-displaymode=\"Original\" \/><figcaption class=\"wp-caption-text\">Tim Bayne, Anil Seth and Marcello Massimini (de gauche \u00e0 droite).<\/figcaption><\/figure>\n<p><span class=\"section-desc-large-text\">Qu\u2019est-ce qui vous fait penser que les \u00eelots de conscience pourraient exister?<br \/>\n<\/span><br \/>\n<strong>Marcello Massimini :<\/strong><br \/>\nIl est difficile de nier leur existence chez les patients atteints d\u2019une l\u00e9sion c\u00e9r\u00e9brale. \u00c0 tout le moins, chez le cerveau humain, c\u2019est une conclusion logique. Nous savons qu\u2019une personne peut \u00eatre aveugle, sourde, compl\u00e8tement paralys\u00e9e et d\u00e9sensibilis\u00e9e, mais toujours consciente. Nous pouvons facilement imaginer l\u2019un de ces patients, atteint disons d\u2019une forme extr\u00eame du syndrome d\u2019enfermement, qui peut encore communiquer en clignant faiblement d\u2019un \u0153il. Nul ne nierait que ce patient est encore conscient. Maintenant, si le dernier axone qui innerve la paupi\u00e8re se fait couper, pourquoi son univers interne dispara\u00eetrait-il soudainement? Si nous nous appuyons sur la logique et le rasoir d\u2019Occam, nous arrivons \u00e0 la conclusion que les \u00eelots de conscience doivent exister!<\/p>\n<h2 class=\"cust-post-title\"><span class=\"section-desc-large-text\">Pourquoi se soucier de consid\u00e9rations \u00e9thiques si nous ne sommes pas certains de l\u2019existence de ces \u00eelots?<\/span><\/h2>\n<p><strong>Anil Seth :<\/strong><br \/>\nNotre position \u00e9thique est souvent fortement d\u00e9finie par le contexte. Par exemple, m\u00eame si nous examinons imm\u00e9diatement les consid\u00e9rations \u00e9thiques dans le cas d\u2019un patient dont la conscience est alt\u00e9r\u00e9e, nous ne montrerons peut-\u00eatre pas la m\u00eame rigueur en pr\u00e9sence d\u2019un \u00ab organo\u00efde c\u00e9r\u00e9bral \u00bb mis au point \u00e0 des fins technologiques \u2013 principalement pour faire avancer la recherche m\u00e9dicale. Toutefois, toutes les technologies ont des cons\u00e9quences inattendues et nous devrions particuli\u00e8rement pr\u00eater attention \u00e0 ces cons\u00e9quences en pr\u00e9sence d\u2019une technologie qui \u00e9volue rapidement \u2013 comme c\u2019est le cas des organo\u00efdes c\u00e9r\u00e9braux. Pourraient-ils \u00eatre des \u00eelots de conscience? En ce moment, dans leur \u00e9tat actuel, il est improbable qu\u2019ils aient quelque exp\u00e9rience consciente que ce soit, mais cette technologie \u00e9volue \u00e0 un rythme impressionnant.<\/p>\n<p>La cr\u00e9ation en grand nombre de ces objets qui, au bout du compte, pourraient conna\u00eetre la souffrance constituerait une catastrophe sur le plan \u00e9thique. Il n\u2019y a qu\u2019une infime possibilit\u00e9 que cela s\u2019av\u00e8re, mais une infime possibilit\u00e9 d\u2019une catastrophe majeure est \u00e0 prendre tr\u00e8s au s\u00e9rieux.<\/p>\n<p>Le genre d\u2019\u00e9thique qui convient \u00e0 la pr\u00e9sente situation est une \u00e9thique pr\u00e9ventive. Il faut consid\u00e9rer ces situations alors que leur probabilit\u00e9 semble tr\u00e8s faible.<\/p>\n<h3 class=\"cust-small-title\"><span class=\"section-desc-large-text\">Comment cette collaboration a-t-elle vu le jour?<\/span><\/h3>\n<p><strong>Tim Bayne :<br \/>\n<\/strong>\u00c0 la r\u00e9union de d\u00e9cembre 2018 du programme Cerveau, esprit et conscience Azrieli, Marcello a fait une courte pr\u00e9sentation sur l\u2019id\u00e9e d\u2019un patient, apr\u00e8s un coma, qui \u00e9tait conscient, mais qui \u00e9tait absolument incapable d\u2019interagir.<\/p>\n<p>C\u2019est alors qu\u2019Anil Seth a mentionn\u00e9 qu\u2019il avait r\u00e9fl\u00e9chi aux h\u00e9misph\u00e9rotomies o\u00f9 les connexions avec l\u2019un des h\u00e9misph\u00e8res du cerveau sont sectionn\u00e9es, mais laiss\u00e9es in situ. L\u2019id\u00e9e fascinante dans une telle situation c\u2019est qu\u2019il y ait encore une certaine activit\u00e9 neuronale dans l\u2019h\u00e9misph\u00e8re d\u00e9connect\u00e9.<\/p>\n<p>J\u2019arrivais d\u2019Australie et un tel d\u00e9calage horaire est difficile \u00e0 surmonter. Quand je prends ce vol, je suis incapable de dormir et, ensuite, les r\u00e9unions du CIFAR me stimulent beaucoup. Alors r\u00e8gle g\u00e9n\u00e9rale, je suis tr\u00e8s fatigu\u00e9, je dors deux heures, je me r\u00e9veille \u00e0 21 h et je suis ensuite incapable de dormir jusqu\u2019au matin. Mais cette fois-l\u00e0, je ne me suis pas couch\u00e9, je suis rest\u00e9 debout jusqu\u2019\u00e0 5 h du matin \u00e0 \u00e9crire un article qui traitait de certaines des questions philosophiques soulev\u00e9es par Marcello et Anil, et, au petit d\u00e9jeuner, je leur ai envoy\u00e9 une \u00e9bauche.<\/p>\n<h3 class=\"cust-small-title\"><span class=\"section-desc-large-text\">Quelles sont les r\u00e9percussions sur les th\u00e9ories de la conscience?<\/span><\/h3>\n<p><strong>Marcello Massimini :<br \/>\n<\/strong>Selon moi, la r\u00e9percussion la plus g\u00e9n\u00e9rale est la remise en question de l\u2019approche fonctionnaliste de la conscience. Dans cette optique, les cerveaux conscients sont des appareils physiques qui, comme les ordinateurs, ex\u00e9cutent des calculs \u00e0 l\u2019aide d\u2019intrants sensoriels qui m\u00e8nent \u00e0 des comportements int\u00e9ressants. La d\u00e9monstration ou la reconnaissance de l\u2019existence d\u2019\u00eelots de conscience d\u00e9connect\u00e9s des intrants sensoriels et des extrants moteurs dirigerait davantage notre attention vers les propri\u00e9t\u00e9s c\u00e9r\u00e9brales intrins\u00e8ques. Cela a des r\u00e9percussions int\u00e9ressantes sur la fa\u00e7on dont nous voyons et \u00e9valuons la conscience, \u00e0 la fois dans des syst\u00e8mes naturels et artificiels.<\/p>\n<p><strong>Anil Seth :<\/strong><br \/>\nCertains se portent \u00e0 la d\u00e9fense de ce qu\u2019on a appel\u00e9 une vision externaliste de la conscience voulant que le corps et l\u2019environnement ne fassent pas que d\u00e9finir l\u2019exp\u00e9rience consciente, mais en repr\u00e9sentent aussi les \u00e9l\u00e9ments constitutifs essentiels. Comme si le substrat de la conscience ne se confinait pas au cr\u00e2ne et qu\u2019il s\u2019\u00e9tendait au corps dans le monde qui nous entoure. Si les \u00eelots de conscience existent, ce genre de th\u00e9orie devient alors plus difficile \u00e0 d\u00e9fendre, car un \u00eelot de conscience par d\u00e9finition est une situation o\u00f9 cela ne se produit pas et ne peut pas se produire.<\/p>\n<p><strong>Tim Bayne :<\/strong><br \/>\nNous pourrions travailler aux deux th\u00e9ories principales de la conscience, soit la Th\u00e9orie de l\u2019espace de travail global et la Th\u00e9orie de l\u2019information int\u00e9gr\u00e9e, pour qu\u2019elles soient coh\u00e9rentes avec l\u2019existence des \u00eelots de conscience. En cons\u00e9quence, si l\u2019existence de ces \u00eelots s\u2019av\u00e8re, ces th\u00e9ories ne s\u2019\u00e9crouleraient pas. Il s\u2019agit n\u00e9anmoins d\u2019un point de donn\u00e9es incroyablement utile et nous avons besoin de tous les points de donn\u00e9es possibles pour tenter de formuler une th\u00e9orie de la conscience.<\/p>\n<hr \/>\n<p>L\u2019article de recherche \u00ab Are There Islands of Awareness? \u00bb est disponible en ligne sur le\u00a0<span style=\"color: #ff0000;\"><a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/www.cell.com\/trends\/neurosciences\/fulltext\/S0166-2236(19)30216-4\" target=\"_blank\" rel=\"noopener noreferrer\">site Web de\u00a0<em>Trends in Neuroscience<\/em><\/a>.<\/span><\/p>\n<p>Le\u00a0<span style=\"color: #ff0000;\"><a class=\"color-red\" style=\"color: #ff0000;\" href=\"https:\/\/cifar.ca\/fr\/recherche\/programme\/cerveau-esprit-et-conscience-azrieli\" target=\"_blank\" rel=\"noopener noreferrer\">programme Cerveau, esprit et conscience Azrieli<\/a><\/span>, fond\u00e9 en 2014, examine les bases fondamentales de la conscience et \u00e9tablit des corr\u00e9lations entre les r\u00e9sultats obtenus, et la biologie et la philosophie. En cr\u00e9ant des possibilit\u00e9s de collaborations \u00e9troites entre les domaines et les disciplines, le programme permet aux boursiers de se pencher sur l\u2019une des questions les plus fondamentales sur la nature humaine : quels sont les origines et les m\u00e9canismes de la conscience? Le programme Cerveau, esprit et conscience Azrieli est en train de cr\u00e9er un cadre pour aider les boursiers d\u2019un \u00e9ventail de disciplines \u00e0 comprendre comment notre cerveau donne naissance \u00e0 la conscience et \u00e0 notre perspective unique sur le monde qui nous entoure.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les boursiers du CIFAR Tim Bayne, Anil Seth et Marcello Massimini posent la question suivante : la conscience peut-elle persister dans un cerveau qui est compl\u00e8tement coup\u00e9 du monde ext\u00e9rieur?<\/p>\n","protected":false},"author":65,"featured_media":31191,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3877],"tags":[],"class_list":["post-31146","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cerveau-esprit-et-conscience"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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