?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Categorical+Perception+and+the+Evolution+of+Supervised+Learning+in+Neural+Nets&rft.creator=Harnad%2C+Stevan&rft.creator=Hanson%2C+S.J.&rft.creator=Lubin%2C+J.&rft.subject=Neural+Nets&rft.subject=Perceptual+Cognitive+Psychology&rft.description=Some+of+the+features+of+animal+and+human+categorical+perception%0A(CP)+for+color%2C+pitch+and+speech+are+exhibited+by+neural+net+simulations+of+CP+with%0Aone-dimensional+inputs%3A+When+a+backprop+net+is+trained+to+discriminate+and+then%0Acategorize+a+set+of+stimuli%2C+the+second+task+is+accomplished+by+%22warping%22+the%0Asimilarity+space+(compressing+within-category+distances+and+expanding%0Abetween-category+distances).+This+natural+side-effect+also+occurs+in+humans+and%0Aanimals.+Such+CP+categories%2C+consisting+of+named%2C+bounded+regions+of+similarity%0Aspace%2C+may+be+the+ground+level+out+of+which+higher-order+categories+are%0Aconstructed%3B+nets+are+one+possible+candidate+for+the+mechanism+that+learns+the%0Asensorimotor+invariants+that+connect+arbitrary+names+(elementary+symbols%3F)+to+the%0Anonarbitrary+shapes+of+objects.+This+paper+examines+how+and+why+such%0Acompression%2Fexpansion+effects+occur+in+neural+nets.+&rft.publisher=Symposium+on+Symbol+Grounding%3A+Problems+and+Practice%2C+Stanford+University&rft.contributor=Powers%2C+D.+W.&rft.contributor=Reeker%2C+L.&rft.date=1991&rft.type=Book+Chapter&rft.type=NonPeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F1579%2F1%2Fharnad91.cpnets.html&rft.identifier=++Harnad%2C+Stevan+and+Hanson%2C+S.J.+and+Lubin%2C+J.++(1991)+Categorical+Perception+and+the+Evolution+of+Supervised+Learning+in+Neural+Nets.++%5BBook+Chapter%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1579%2F