{"id":66664,"date":"2019-05-22T16:03:01","date_gmt":"2019-05-22T14:03:01","guid":{"rendered":"http:\/\/ibecbarcelona.eu\/?p=66664"},"modified":"2020-06-15T11:37:16","modified_gmt":"2020-06-15T09:37:16","slug":"lhipocamp-orquestra-el-proces-cerebral-que-ens-permet-evocar-un-record","status":"publish","type":"post","link":"https:\/\/ibecbarcelona.eu\/ca\/lhipocamp-orquestra-el-proces-cerebral-que-ens-permet-evocar-un-record\/","title":{"rendered":"L’hipocamp orquestra el proc\u00e9s cerebral que ens permet evocar un record"},"content":{"rendered":"

\"\"<\/p>\n

En quin mecanisme biol\u00f2gic es basa aquesta capacitat per \u201cviatjar en el temps\u201d?<\/p>\n

Un estudi liderat per Paul Verschure, Professor de Recerca ICREA a l\u2019IBEC, publicat recentment a la revista Nature Communications<\/em> revela una q\u00fcesti\u00f3 fonamental sobre la mem\u00f2ria humana: per primera vegada, es demostra que l’hipocamp \u00e9s el responsable de coordinar el proc\u00e9s de recuperaci\u00f3 d’un record. Una hip\u00f2tesi que, fins ara, nom\u00e9s s’estudiava de manera te\u00f2rica.<\/p>\n

La clau que ha perm\u00e8s trobar aquest descobriment resideix en els voluntaris que han participat en l’estudi: es tracta de pacients d’epil\u00e8psia que, amb l’objectiu de monitorar la seva malaltia, porten el\u00e8ctrodes intracranials implantats. \u201cAquests pacients ens oferien una oportunitat extraordin\u00e0ria. Gr\u00e0cies als seus implants, hem pogut registrar simult\u00e0niament l’activitat neurofisiol\u00f2gica de l’hipocamp i el neoc\u00f2rtex, quelcom que cap altre estudi en humans havia aconseguit abans\u201d, subratlla Verschure, investigador principal del grup Sistemes Sint\u00e8tics, Perceptius, Emotius i Cognitius (SPECS).<\/p>\n

La realitat virtual, una gran aliada per a la neuroci\u00e8ncia<\/strong><\/p>\n

A m\u00e9s, la recerca ha comptat amb un element poc habitual: la realitat virtual. \u201cVol\u00edem veure qu\u00e8 passa en els processos de mem\u00f2ria quan manipulem l’espai on es desenvolupen\u201d, explica Daniel Pacheco, investigador postdoctoral del grup SPECS de l’IBEC i primer autor de l’article. \u201cEl nostre experiment virtual permet dissociar la relaci\u00f3 existent entre una imatge i el context que l’envolta\u201d.<\/p>\n

Els participants de l’estudi havien de rec\u00f3rrer un laberint virtual format per quatre habitacions, cadascuna amb vint imatges al seu interior. Les habitacions tenien textures diferents a les parets, que servien per identificar-les com a contextos diferents. Primer, cada participant recorria les habitacions i observava les imatges. Despr\u00e9s, tornaven a rec\u00f3rrer el laberint lleugerament modificat: els investigadors havien canviat les vuitanta imatges inicials, algunes es trobaven en una habitaci\u00f3 diferent i altres havien estat substitu\u00efdes per imatges noves. Els participants havien d’indicar quines imatges havien vist abans i quines no.<\/p>\n

\u201cLa mem\u00f2ria implica la conservaci\u00f3 de la informaci\u00f3 al llarg del temps. Recordar un episodi requereix, per tant, el restabliment d’un estat din\u00e0mic en el cervell, un \u2018engrama\u2019\u201d, subratlla Pacheco. Els anomenats engrames de mem\u00f2ria s\u00f3n petjades, patrons en l’activitat del cervell que s’originen quan vam crear un nou record. Cada vegada que rememorem una situaci\u00f3, l\u2019engrama es reprodueix de nou.<\/p>\n

Segons revela l’experiment, quan una persona est\u00e0 recordant un succ\u00e9s, \u00e9s l’hipocamp qui inicia un determinat engrama i, 500 mil\u00b7lisegons despr\u00e9s, el neoc\u00f2rtex se suma a aquesta activitat. \u201cEl nostre estudi demostra que la mem\u00f2ria epis\u00f2dica es basa en interaccions coordinades dins d’una xarxa hipocamp-neoc\u00f2rtex. Aquests resultats proporcionen un gran avan\u00e7 en la nostra comprensi\u00f3 del mecanisme cerebral subjacent a la mem\u00f2ria epis\u00f2dica i obren noves l\u00ednies de recerca relacionades amb l’orquestraci\u00f3 dels engrames de la mem\u00f2ria des d’una perspectiva global del cervell\u201d, afirma Verschure. Les aplicacions futures que alberguen els resultats d’aquest estudi s\u00f3n ambicioses i molt variades: des del tractament d\u2019aquelles persones que han patit episodis traum\u00e0tics, fins al seu \u00fas en casos d’optimitzaci\u00f3 de l’aprenentatge.<\/p>\n

L\u2019estudi, liderat per l\u2019Institut de Bioenginyeria de Catalunya, ha comptat amb la col\u00b7laboraci\u00f3 de Rodrigo Rocamora, cap de la Unitat d\u2019Epil\u00e8psia de l\u2019Hospital del Mar<\/a> de Barcelona, i de Nikolai Axmacher, investigador principal de l’Institut de Neuroci\u00e8ncia Cognitiva<\/a> de la Universitat de Ruhr Bochum<\/a> (Alemanya); i est\u00e0 emmarcat dins el projecte CDAC<\/a>, liderat per Paul Verschure i finan\u00e7at amb una ERC Advanced Grant.<\/p>\n

\n

Article referenciat:\u00a0 <\/strong>Pacheco, D., S\u00e1nchez-Fibla, M., Duff, A., Principe, A., Rocamora, R., Zhang, H., Axmacher, N. & Verschure, P.F.M.J (2019). Coordinated representational reinstatement in the human hippocampus and lateral temporal cortex during episodic memory retrieval<\/em><\/a>. Nature Communications<\/em>, 10, 2255<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

Per primera vegada, investigadors de l’IBEC registren en humans i de manera simult\u00e0nia l’activitat cerebral de dues \u00e0rees clau vinculades a la mem\u00f2ria: l’hipocamp i el neoc\u00f2rtex<\/h3>\n

L’estudi ha estat possible gr\u00e0cies a la participaci\u00f3 volunt\u00e0ria de persones amb epil\u00e8psia que, a causa de la seva malaltia, porten el\u00e8ctrodes intracranials implantats. Fent \u00fas de la realitat virtual, els participants van portar a terme tasques de mem\u00f2ria espacial.<\/br>El gust del berenar en sortir de l\u2019escola, el primer pet\u00f3, aquella festa fins la matinada. Els records s\u00f3n la nostra manera de viatjar al passat i, malgrat que pot semblar f\u00e0cil rememorar una situaci\u00f3, el proc\u00e9s cerebral que es produeix \u00e9s complex i segueix sent, en bona part, un misteri. <\/p>\n","protected":false},"author":4,"featured_media":66638,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[96],"tags":[514,158,592,1151,1145,515,568],"post_formats":[],"class_list":["post-66664","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-noticies-de-recerca","tag-hipocamp","tag-ibec-ca","tag-nature-communications-ca","tag-neocortex-ca","tag-paul-verschure-ca","tag-realitat-virtual","tag-specs-ca"],"yoast_head":"\nL'hipocamp orquestra el proc\u00e9s cerebral que ens permet evocar un record - Institute for Bioengineering of Catalonia<\/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:\/\/ibecbarcelona.eu\/ca\/lhipocamp-orquestra-el-proces-cerebral-que-ens-permet-evocar-un-record\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L'hipocamp orquestra el proc\u00e9s cerebral que ens permet evocar un record - Institute for Bioengineering of Catalonia\" \/>\n<meta property=\"og:description\" content=\"Per primera vegada, investigadors de l'IBEC registren en humans i de manera simult\u00e0nia l'activitat cerebral de dues \u00e0rees clau vinculades a la mem\u00f2ria: l'hipocamp i el neoc\u00f2rtex L'estudi ha estat possible gr\u00e0cies a la participaci\u00f3 volunt\u00e0ria de persones amb epil\u00e8psia que, a causa de la seva malaltia, porten el\u00e8ctrodes intracranials implantats. 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