?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Sparse+Coding+of+Faces+in+a+Neuronal+Model%3A+Interpreting+Cell+Population+Response+in+Object+Recognition.&rft.creator=Trehub%2C+Arnold&rft.subject=Behavioral+Neuroscience&rft.subject=Cognitive+Psychology&rft.description=Response+to+faces+as+measured+by+cell+discharge+in+the+temporal+cortex+of+monkeys+suggests+a+sparse+cell-population+coding+of+complex+visual+stimuli.+The+prevailing+view+assumes+that+a+sparse+population+code+requires+the+joint+contribution+of+a+relatively+small+group+of+cells+(a+neuronal+ensemble)+for+effective+coding+and+recognition.+This+assumption+is+based+primarily+on+the+consistent+observation+that+single+cells+in+the+temporal+cortex+are+broadly+tuned+rather+than+narrowly+tuned+to+individual+faces.+It+has+been+argued+that+the+joint+activity+of+a+relatively+small+number+of+broadly+tuned+cells%2C+each+responsive+to+a+different+constituent+feature+of+a+face%2C+could+form+an+ensemble+code+selective+enough+to+distinguish+individual+faces.+In+the+present+study%2C+schematic+faces+were+presented+as+stimuli+to+a+model+neuronal+system+for+visual+pattern+learning+and+recognition.+This+model+effectively+codes+individual+faces+by+means+of+competitive+activity+among+single+cells+during+recognition+instead+of+by+ensemble+coding.+The+computer+simulation+permitted+an+analysis+of+the+activity+profiles+of+all+tuned+cells+during+learning+and+recognition+of+the+faces.+All+cells+were+found+to+be+broadly+tuned+even+though+coding+was+mediated+by+the+discrete+output+of+single+cells+on+a+competitive+basis+in+a+sparse+neuronal+population+rather+than+by+the+joint+activity+of+a+group+of+cells.+The+results+show+that+the+observation+of+broad+tuning+of+cells+in+temporal+cortex+under+typical+experimental+conditions+does+not+warrant+the+conclusion+that+neuronal+ensembles+are+required+for+the+coding+of+individual+faces.+Suggestions+are+made+for+changes+in+the+design+of+experiments+to+better+test+hypotheses+about+the+coding+of+faces+(or+any+other+complex+visual+patterns).&rft.publisher=Elsevier%3A+North+Holland&rft.contributor=Donahoe%2C+J.+W.&rft.contributor=Packard+Dorsel%2C+V.&rft.date=1997&rft.type=Book+Chapter&rft.type=NonPeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F37%2F1%2FPopCod.html&rft.identifier=++Trehub%2C+Arnold++(1997)+Sparse+Coding+of+Faces+in+a+Neuronal+Model%3A+Interpreting+Cell+Population+Response+in+Object+Recognition.++%5BBook+Chapter%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F37%2F