?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Representation+of+Similarity+in+3D+Object+Discrimination&rft.creator=Edelman%2C+Shimon&rft.subject=Cognitive+Psychology&rft.description=How+does+the+brain+represent+visual+objects%3F+In+simple+perceptual+generalization+tasks%2C+the+human+visual+system+performs+as+if+it+represents+the+stimuli+in+a+low-dimensional+metric+psychological+space.+In+theories+of+3D+shape+recognition%2C+the+role+of+feature-space+representations+(as+opposed+to+structural+or+pictorial+descriptions)+has+been+for+a+long+time+a+major+point+of+contention.+If+shapes+are+indeed+represented+as+points+in+a+feature+space%2C+patterns+of+perceived+similarity+among+different+objects+must+reflect+the+structure+of+this+space.+The+feature+space+hypothesis+can+then+be+tested+by+presenting+subjects+with+complex+parameterized+3D+shapes%2C+and+by+relating+the+similarities+among+subjective+representations%2C+as+revealed+in+the+response+data+by+multidimensional+scaling%2C+to+the+objective+parameterization+of+the+stimuli.+The+results+of+four+such+tests%2C+accompanied+by+computational+simulations%2C+support+the+notion+that+discrimination+among+3D+objects+may+rely+on+a+low-dimensional+feature+space+representation%2C+and+suggest+that+this+space+may+be+spanned+by+explicitly+encoded+class+prototypes.&rft.date=1995&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpostscript&rft.identifier=http%3A%2F%2Fcogprints.org%2F575%2F2%2F199711009.ps&rft.identifier=++Edelman%2C+Shimon++(1995)+Representation+of+Similarity+in+3D+Object+Discrimination.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F575%2F