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Synaptic depression and slow oscillatory activity in a biophysical network model of the cerebral cortex
Benita, Jose M.; Guillamon Grabolosa, Antoni; Deco, Gustavo; Sánchez-Vives, Maria V.
Universitat Politècnica de Catalunya. Departament de Matemàtica Aplicada I; Universitat Politècnica de Catalunya. EGSA - Equacions Diferencials, Geometria, Sistemes Dinàmics i de Control, i Aplicacions
Short-termsynapticdepression(STD)isaformofsynapticplasticitythathasalargeimpactonnetworkcomputations.ExperimentalresultssuggestthatSTDismodulatedbycorticalactivity,decreasingwithactivityinthenetworkandincreasingduringsilentstates.Here,weexploreddifferentactivity-modulationprotocolsinabiophysicalnetworkmodelforwhichthemodeldisplayedlessSTDwhenthenetworkwasactivethanwhenitwassilent,inagreementwithexperimentalresults.Furthermore,westudiedhowtrainsofsynapticpotentialshadlesserdecayduringperiodsofactivity(UPstates)thanduringsilentperiods(DOWNstates),providingnewexperimentalpredictions.WenexttackledtheinversequestionofwhatistheimpactofmodifyingSTDparametersontheemergentactivityofthenetwork,aquestiondifficulttoanswerexperimentally.Wefoundthatsynapticdepressionofcorticalconnectionshadacriticalroletodeterminetheregimeofrhythmiccorticalactivity.WhilelowSTDresultedinanemergentrhythmicactivitywithshortUPstatesandlongDOWNstates,increasingSTDresultedinlongerandmorefrequentUPstatesinterleavedwithshortsilentperiods.Astillhighersynapticdepressionsetthenetworkintoanon-oscillatoryfiringregimewhereDOWNstatesnolongeroccurred.ThespeedofpropagationofUPstatesalongthenetworkwasnotfoundtobemodulatedbySTDduringtheoscillatoryregime;itremainedrelativelystableoverarangeofvaluesofSTD.Overall,wefoundthatthemutualinteractionsbetweensynapticdepressionandongoingnetworkactivityarecriticaltodeterminethemechanismsthatmodulatecorticalemergentpatterns
Peer Reviewed
Àrees temàtiques de la UPC::Matemàtiques i estadística::Matemàtica aplicada a les ciències
Cerebral cortex
Computational neuroscience
cortical activity
network model
short-term depression
up/down state
synaptic plasticity
Escorça cerebral
Neurociència computacional
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/publishedVersion
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