Holding multiple items in short term memory: a neural mechanism

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• dc.contributor.author Rolls, Edmund Tca
• dc.contributor.author Dempere-Marco, Lauraca
• dc.contributor.author Deco, Gustavoca
• dc.date.accessioned 2016-02-16T19:42:15Z
• dc.date.available 2016-02-16T19:42:15Z
• dc.date.issued 2013
• dc.description.abstract Human short term memory has a capacity of several items maintained simultaneously. We show how the number of short term memory representations that an attractor network modeling a cortical local network can simultaneously maintain active is increased by using synaptic facilitation of the type found in the prefrontal cortex. We have been able to maintain 9 short term memories active simultaneously in integrate-and-fire simulations where the proportion of neurons in each population, the sparseness, is 0.1, and have confirmed the stability of such a system with mean field analyses. Without synaptic facilitation the system can maintain many fewer memories active in the same network. The system operates because of the effectively increased synaptic strengths formed by the synaptic facilitation just for those pools to which the cue is applied, and then maintenance of this synaptic facilitation in just those pools when the cue is removed by the continuing neuronal firing in those pools. The findings have implications for understanding how several items can be maintained simultaneously in short term memory, how this may be relevant to the implementation of language in the brain, and suggest new approaches to understanding and treating the decline in short term memory that can occur with normal aging.ca
• dc.description.sponsorship This work was supported by the Spanish Research Projects BFU2007-61710, CONSOLIDER CSD2007-00012; the Oxford McDonnell Centre for Cognitive Neuroscience; the Oxford Centre for Computational Neuroscience; MIDECO through the Ramon y Cajal Programme (LDM); and from the TIN2010-21771-C02-02 project (LDM). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
• dc.format.mimetype application/pdfca
• dc.identifier.citation Rolls ET, Dempere L, Deco G. Holding multiple items in short term memory: a neural mechanism. 2013;8(4):1-13. DOI: 10.1371/journal.pone.0061078.
• dc.identifier.doi http://dx.doi.org/10.1371/journal.pone.0061078
• dc.identifier.issn 1932-6203
• dc.identifier.uri http://hdl.handle.net/10230/25848
• dc.language.iso engca
• dc.publisher Public Library of Scienceca
• dc.relation.ispartof PLoS ONE. 2013;8(4):1-13
• dc.relation.projectID info:eu-repo/grantAgreement/ES/2PN/BFU2007-61710
• dc.relation.projectID info:eu-repo/grantAgreement/ES/2PN/CSD2007-00012
• dc.relation.projectID info:eu-repo/grantAgreement/ES/3PN/TIN2010-21771-C02-02
• dc.rights © 2013 Rolls et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ca
• dc.rights.accessRights info:eu-repo/semantics/openAccessca
• dc.title Holding multiple items in short term memory: a neural mechanismca
• dc.type info:eu-repo/semantics/articleca
• dc.type.version info:eu-repo/semantics/publishedVersionca