?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Translation+Invariance+in+Object+Recognition+and+its+Relation+to+other+Visual+Transformations&rft.creator=Dill%2C+Marcus&rft.creator=Edelman%2C+Shimon&rft.subject=Cognitive+Psychology&rft.description=Human+object+recognition+is+generally+considered+to+tolerate+changes+of+the+stimulus+position+in+the+visual+field.+A+number+of+recent+studies%2C+however%2C+have+cast+doubt+on+the+completeness+of+translation+invariance.+In+a+new+series+of+experiments+we+tried+to+investigate+whether+positional+specificity+of+short-term+memory+is+a+general+property+of+visual+perception.+We+tested+same-different+discrimination+of+computer+graphics+models+that+were+displayed+at+the+same+or+at+different+locations+of+the+visual+field%2C+and+found+complete+translation+invariance%2C+regardless+of+the+similarity+of+the+animals+and+irrespective+of+direction+and+size+of+the+displacement+(Exp.+1+and+2).+Decisions+were+strongly+biased+towards+same+decisions+if+stimuli+appeared+at+a+constant+location%2C+while+after+translation+subjects+displayed+a+tendency+towards+different+decisions.+Even+if+the+spatial+order+of+animal+limbs+was+randomized+(%22scrambled+animals%22)%2C+no+deteriorating+effect+of+shifts+in+the+field+of+view+could+be+detected+(Exp.+3).+However%2C+if+the+influence+of+single+features+was+reduced+(Exp.+4+and+5)+small+but+significant+effects+of+translation+could+be+obtained.+Under+conditions+that+do+not+reveal+an+influence+of+translation%2C+rotation+in+depth+strongly+interferes+with+recognition+(Exp.+6).+Changes+of+stimulus+size+did+not+reduce+performance+(Exp.+7).+Tolerance+to+these+object+transformations+seems+to+rely+on+different+brain+mechanisms%2C+with+translation+and+scale+invariance+being+achieved+in+principle%2C+while+rotation+invariance+is+not.&rft.date=1997-07&rft.type=Preprint&rft.type=NonPeerReviewed&rft.format=application%2Fpostscript&rft.identifier=http%3A%2F%2Fcogprints.org%2F559%2F2%2F199710001.ps&rft.identifier=++Dill%2C+Marcus+and+Edelman%2C+Shimon++(1997)+Translation+Invariance+in+Object+Recognition+and+its+Relation+to+other+Visual+Transformations.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F559%2F