{"id":7925,"date":"2019-07-04T14:30:30","date_gmt":"2019-07-04T12:30:30","guid":{"rendered":"http:\/\/sydologie.com\/?p=7925"},"modified":"2024-11-22T15:44:08","modified_gmt":"2024-11-22T14:44:08","slug":"sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant","status":"publish","type":"post","link":"https:\/\/sydo.fr\/sydologie\/2019\/07\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\/","title":{"rendered":"[Sus aux neuromythes\u00a0! ] Episode 1\u00a0: Notre capacit\u00e9 \u00e0 apprendre s\u2019effrite en vieillissant"},"content":{"rendered":"<p>Une grande partie de l\u2019opinion s\u2019accorde \u00e0 dire que notre cerveau ne cesse de r\u00e9gresser avec l\u2019\u00e2ge, qu\u2019on perdrait d\u2019une fa\u00e7on inexorable des neurones sans possibilit\u00e9 de renouvellement, ce qui limiterait notre capacit\u00e9 \u00e0 apprendre \u00e0 l\u2019\u00e2ge adulte.<\/p>\n<p>C\u2019est totalement <strong>faux<\/strong>\u00a0: notre cerveau a la capacit\u00e9 de g\u00e9n\u00e9rer des neurones tout au long de notre existence<a href=\"#_ftn1\" name=\"_ftnref1\">[1]<\/a>.<\/p>\n<h2>Le dogme de la fixit\u00e9 neuronale mis \u00e0 mal<\/h2>\n<p>Ce neuro-mythe ne s\u2019appuie pas sur rien. En effet, pendant pr\u00e8s d\u2019un si\u00e8cle, et ce jusqu\u2019\u00e0 il y a une vingtaine d\u2019ann\u00e9es, on pensait le nombre de neurones fix\u00e9 \u00e0 la naissance. Nous disposerions ainsi d\u2019un capital de 80 \u00e0 100 milliards de neurones et nous ne cesserions d\u2019en perdre en vieillissant et ce, de mani\u00e8re irr\u00e9m\u00e9diable. C\u2019est le p\u00e8re de la neurobiologie, Santiago Ram\u00f3n y Cajal, qui avait \u00e9dict\u00e9 ce dogme sur la <strong>fixit\u00e9 neuronale<\/strong>.<\/p>\n<p>Des scientifiques remirent en question ce dogme dans la seconde partie du XX\u00e8me si\u00e8cle apr\u00e8s avoir observ\u00e9 l\u2019\u00e9volution de cerveaux d\u2019animaux. Cependant, ces \u00e9tudes furent bloqu\u00e9es, cr\u00e9ant une importante controverse, le dogme sur la fixit\u00e9 neuronale demeurant intouchable.<\/p>\n<p>Il faut attendre les ann\u00e9es 1980 et l\u2019utilisation de la technique du marquage au bromod\u00e9soxyuridine (BRDU) sur les cerveaux d\u2019animaux pour faire vaciller ce dogme. Ce marqueur permet en effet de rendre fluorescentes les cellules en cours de division, c\u2019est-\u00e0-dire qui sont en train de se reproduire.<\/p>\n<p>En 1998, de nouveaux tests r\u00e9alis\u00e9s cette fois sur des primates par Elizabeth Gould permettent de prouver l\u2019existence de la neurogen\u00e8se chez l\u2019adulte humain, proche cousin du singe.<\/p>\n<p>Ainsi, l\u2019humain cr\u00e9erait entre 700 et 1400 neurones par jour, selon les \u00e9tudes, et ce, quel que soit son \u00e2ge. Pas de quoi se pavaner\u00a0: la souris, elle, en cr\u00e9erait plus de 30\u00a0000 par jour.<\/p>\n<p>Cette neurogen\u00e8se aurait lieu dans deux parties pr\u00e9cises du cerveau se situant dans les hippocampes\u00a0:\u00a0la zone sous-ventriculaire et le gyrus dent\u00e9.<\/p>\n<p>La cr\u00e9ation de neurones dans ces cerveaux est cruciale pour \u00eatre r\u00e9actif, s\u2019adapter rapidement \u00e0 l\u2019\u00e9volution d\u2019une situation et \u00e0 l\u2019apparition d\u2019un probl\u00e8me. Ces nouveaux neurones servent aussi \u00e0 m\u00e9moriser et \u00e0 marquer \u00e9motionnellement ses souvenirs afin notamment de discriminer des situations et d\u2019identifier si on doit garder ce moment en m\u00e9moire.<\/p>\n<h2>Bonnes pratiques pour une neurogen\u00e8se efficace<\/h2>\n<p>La neurogen\u00e8se et le maintien en vie de ces nouveaux neurones, qui d\u00e9pend de sa capacit\u00e9 \u00e0 cr\u00e9er des connexions avec les autres neurones, sont favoris\u00e9s par de nombreuses activit\u00e9s\u00a0:<\/p>\n<ul>\n<li>Le voyage, la d\u00e9couverte de nouvelles choses et les interactions sociales\u00a0: cela stimule le cerveau et donc pousse les jeunes neurones \u00e0 m\u00e9moriser de nouvelles informations. <strong>\u00c9vitez la routine\u00a0!<\/strong><\/li>\n<li>L\u2019apprentissage, le jeu et la m\u00e9ditation sollicitent fortement ces nouveaux neurones et les poussent \u00e0 se c\u00e2bler.<\/li>\n<li>La pratique d\u2019activit\u00e9s sportives, et particuli\u00e8rement l\u2019augmentation du rythme cardiaque et respiratoire. La p\u00e9tanque ne suffira pas. D\u00e9so.<\/li>\n<li>Le sexe\u00a0: l\u2019ocytocine, aussi appel\u00e9e hormone du bonheur ou de l\u2019amour, que l\u2019on s\u00e9cr\u00e8te notamment lors d\u2019un orgasme, favorise la neurogen\u00e8se. N\u2019h\u00e9sitez plus\u00a0: <strong>stimulez votre cerveau, faites-vous plaisir\u00a0!<\/strong><\/li>\n<li>Une alimentation saine, riche en fibres (fruits, l\u00e9gumes et c\u00e9r\u00e9ales compl\u00e8tes) et en aliments ferment\u00e9s\u00a0: vive la choucroute et la soupe miso. La neurogen\u00e8se peut \u00eatre fortement perturb\u00e9e par la pr\u00e9sence de bact\u00e9ries nocives dans l\u2019intestin.<\/li>\n<\/ul>\n<h2>Le stress, ce tueur de neurones<\/h2>\n<p>Au contraire, de nombreux facteurs peuvent limiter la production de neurones ou favoriser l\u2019auto-destruction des nouveaux neurones\u00a0:<\/p>\n<ul>\n<li>Le<strong> stress<\/strong>\u00a0: lorsque le stress devient chronique, il provoque un trop-plein de cortisol dans le sang, hormone notamment active dans le m\u00e9tabolisme des glucides, des prot\u00e9ines et des lipides. Cette grande quantit\u00e9 de cortisol est ensuite achemin\u00e9e dans le cerveau, ce qui stoppe la neurogen\u00e8se.<\/li>\n<li>Les <strong>psychotropes<\/strong>, comme les anxiolytiques et certains somnif\u00e8res\u00a0: leur consommation limiterait les connexions entre neurones. Les neuroscientifiques ont ainsi avanc\u00e9 que les personnes d\u00e9pressives ne cr\u00e9aient plus de nouveaux neurones.<\/li>\n<\/ul>\n<p>D\u2019autres \u00e9l\u00e9ments peuvent d\u00e9t\u00e9riorer la neurogen\u00e8se et le d\u00e9veloppement des nouveaux neurones\u00a0: l\u2019anxi\u00e9t\u00e9, le stress post-traumatique, les carences en sommeil, etc.<\/p>\n<h2>Une r\u00e9volution pour le traitement des maladies neurod\u00e9g\u00e9n\u00e9ratives et des liaisons du cerveau\u00a0? <\/h2>\n<p>La d\u00e9couverte de la cr\u00e9ation de nouveaux neurones tout au long de la vie ouvre le champ des possibles en mati\u00e8re de traitement des maladies neurod\u00e9g\u00e9n\u00e9ratives des liaisons du cerveau.<\/p>\n<p>Pourquoi ne pas injecter ou d\u00e9river ces jeunes neurones des hippocampes vers les parties d\u00e9grad\u00e9es d\u2019un cerveau et mettre ainsi la neurogen\u00e8se au profit de l\u2019ensemble du cerveau\u00a0?<\/p>\n<p>La neurogen\u00e8se pourrait-elle \u00eatre relanc\u00e9e chez les personnes \u00e2g\u00e9es dont le nombre de cellules souches s\u2019amenuise\u00a0?<\/p>\n<p>Les transfusions de jeunes neurones pourraient-elles repr\u00e9senter une fontaine de jouvence pour les cerveaux \u00e2g\u00e9s ou ab\u00eem\u00e9s\u00a0?<\/p>\n<p>Les recherches n\u2019en sont qu\u2019\u00e0 leurs pr\u00e9mices, soyons patients et abstenons-nous de crier au miracle.<\/p>\n<p>&nbsp;<br \/>\n&nbsp;<\/p>\n<p><em><a href=\"#_ftnref1\" name=\"_ftn1\">[1]<\/a> Attention, le cerveau vieillit tout de m\u00eame\u00a0: les neurones se d\u00e9t\u00e9riorent sous l\u2019effet de plusieurs facteurs (polluants, toxines, etc.) et le nombre de cellules-souches, \u00e0 la base de la cr\u00e9ation de nouvelles cellules, donc de neurones, semble d\u00e9cliner avec l\u2019\u00e2ge, engendrant un vieillissement cognitif.<br \/>\n&nbsp;<\/em><br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n<strong>&#8211; <a href=\"https:\/\/sydologie.com\/2019\/07\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\/\"target=\"blank\">Episode 1 : Notre capacit\u00e9 \u00e0 apprendre s\u2019effrite en vieillissant<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2019\/07\/sus-aux-neuromythes-episode-2-vous-etes-plutot-cerveau-gauche-ou-cerveau-droit\/\"target=\"blank\">Episode 2 : Vous \u00eates plut\u00f4t \u00ab cerveau gauche \u00bb ou \u00ab cerveau droit \u00bb ?<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2019\/09\/sus-aux-neuromythes-episode-2-vous-etes-plutot-cerveau-gauche-ou-cerveau-droit-est-verrouille-sus-aux-neuromythes-episode-3-faites-travailler\/\"target=\"blank\">Episode 3 : Faites travailler vos m\u00e9ninges !<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2019\/10\/sus-aux-neuromythes-episode-4-nous-nutilisons-que-10-des-capacites-de-notre-cerveau\/\"target=\"blank\">Episode 4 : Nous n\u2019utilisons que 10% des capacit\u00e9s de notre cerveau<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2019\/12\/sus-aux-neuromythes-episode-5-nous-pouvons-apprendre-une-nouvelle-langue-en-dormant\/\"target=\"blank\">Episode 5 : Nous pouvons apprendre une nouvelle langue en dormant !<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2020\/01\/sus-aux-neuromythes-episode-6-les-femmes-sont-multitaches-et-pas-les-hommes\/\"target=\"blank\">Episode 6 : Les femmes sont multit\u00e2ches (et pas les hommes)<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2020\/06\/sus-aux-neuromythes-episode-7-buvez-de-leau-et-musclez-votre-cerveau\/\"target=\"blank\">Episode 7 : Buvez de l\u2019eau et musclez votre cerveau !<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2020\/06\/sus-aux-neuromythes-episode-7-buvez-de-leau-et-musclez-votre-cerveau-partie-2-2\/\"target=\"blank\">Episode 7 : Buvez de l\u2019eau et musclez votre cerveau ! (partie 2\/2)<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2021\/02\/sus-aux-neuromythes-episode-8-trouve-ton-style-dapprentissage-pour-booster-celui-ci-partie-1-2\/\"target=\"blank\">Episode 8 : Trouve ton style d\u2019apprentissage pour booster celui-ci ! (partie 1\/2)<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2021\/02\/sus-aux-neuromythes-episode-8-trouve-ton-style-dapprentissage-pour-booster-celui-ci-partie-2-2\/\"target=\"blank\">Episode 8 : Trouve ton style d\u2019apprentissage pour booster celui-ci ! (partie 2\/2)<\/a><br \/>\n&#8211; <a href=\"https:\/\/sydologie.com\/2023\/09\/sus-aux-neuromythes-episode-9-une-tete-bien-pleine-une-tete-bien-faite\/\"target=\"blank\">Episode 9 : Une t\u00eate bien pleine, une t\u00eate bien faite<\/a><\/strong><br \/>\n&nbsp;<br \/>\n&nbsp;<br \/>\n&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"Une grande partie de l\u2019opinion s\u2019accorde \u00e0 dire que notre cerveau ne cesse de r\u00e9gresser avec l\u2019\u00e2ge, qu\u2019on perdrait d\u2019une fa\u00e7on inexorable des neurones sans possibilit\u00e9 de renouvellement, ce qui limiterait notre capacit\u00e9 \u00e0 apprendre \u00e0 l\u2019\u00e2ge adulte. C\u2019est totalement faux\u00a0: notre cerveau a la capacit\u00e9 de g\u00e9n\u00e9rer des neurones tout au long de notre&#8230; <a class=\"view-article\" href=\"https:\/\/sydo.fr\/sydologie\/2019\/07\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\/\">Voir l&rsquo;article<\/a>","protected":false},"author":41,"featured_media":7935,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"rop_custom_images_group":[],"rop_custom_messages_group":[],"rop_publish_now":"initial","rop_publish_now_accounts":[],"rop_publish_now_history":[],"rop_publish_now_status":"pending","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[2],"tags":[133,173,1673,814],"class_list":["post-7925","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-le-mag","tag-booster-son-cerveau","tag-cerveau","tag-neuromythe","tag-neurones"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Sus aux neuromythes\u00a0! ] Episode 1\u00a0: Notre capacit\u00e9 \u00e0 apprendre s\u2019effrite en vieillissant - Sydologie<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sydo.fr\/sydologie\/2019\/07\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Sus aux neuromythes\u00a0! ] Episode 1\u00a0: Notre capacit\u00e9 \u00e0 apprendre s\u2019effrite en vieillissant - Sydologie\" \/>\n<meta property=\"og:description\" content=\"Une grande partie de l\u2019opinion s\u2019accorde \u00e0 dire que notre cerveau ne cesse de r\u00e9gresser avec l\u2019\u00e2ge, qu\u2019on perdrait d\u2019une fa\u00e7on inexorable des neurones sans possibilit\u00e9 de renouvellement, ce qui limiterait notre capacit\u00e9 \u00e0 apprendre \u00e0 l\u2019\u00e2ge adulte. C\u2019est totalement faux\u00a0: notre cerveau a la capacit\u00e9 de g\u00e9n\u00e9rer des neurones tout au long de notre... Voir l&#039;article\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sydo.fr\/sydologie\/2019\/07\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\/\" \/>\n<meta property=\"og:site_name\" content=\"Sydologie\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/sydologie\" \/>\n<meta property=\"article:published_time\" content=\"2019-07-04T12:30:30+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-22T14:44:08+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/i0.wp.com\/sydo.fr\/sydologie\/wp-content\/uploads\/2019\/07\/banniere_neuromythes1.png?fit=1434%2C803&ssl=1\" \/>\n\t<meta property=\"og:image:width\" content=\"1434\" \/>\n\t<meta property=\"og:image:height\" content=\"803\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Aymeric Debrun\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Aymeric Debrun\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/sydo.fr\\\/sydologie\\\/2019\\\/07\\\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sydo.fr\\\/sydologie\\\/2019\\\/07\\\/sus-aux-neuro-mythes-episode-1-notre-capacite-a-apprendre-seffrite-en-vieillissant\\\/\"},\"author\":{\"name\":\"Aymeric Debrun\",\"@id\":\"https:\\\/\\\/sydo.fr\\\/sydologie\\\/#\\\/schema\\\/person\\\/08adcb55d6ee64283a6186351e725e7d\"},\"headline\":\"[Sus aux neuromythes\u00a0! 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