?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Learned+Categorical+Perception+in+Neural+Nets%3A+Implications+for+Symbol+Grounding&rft.creator=Harnad%2C+Stevan&rft.creator=Hanson%2C+Stephen+J.&rft.creator=Lubin%2C+Joseph&rft.subject=Dynamical+Systems&rft.subject=Neural+Nets&rft.subject=Perceptual+Cognitive+Psychology&rft.description=After+people+learn+to+sort+objects+into+categories+they+see+them+differently.+Members+of%0Athe+same+category+look+more+alike+and+members+of+different+categories+look+more+different.+This%0Aphenomenon+of+within-category+compression+and+between-category+separation+in+similarity+space+is%0Acalled+categorical+perception+(CP).+It+is+exhibited+by+human+subjects%2C+animals+and+neural+net+models.%0AIn+backpropagation+nets+trained+first+to+auto-associate+12+stimuli+varying+along+a+one-dimensional%0Acontinuum+and+then+to+sort+them+into+3+categories%2C+CP+arises+as+a+natural+side-effect+because+of+four%0Afactors%3A+(1)+Maximal+interstimulus+separation+in+hidden-unit+space+during+auto-association+learning%2C+(2)%0Amovement+toward+linear+separability+during+categorization+learning%2C+(3)+inverse-distance+repulsive+force%0Aexerted+by+the+between-category+boundary%2C+and+(4)+the+modulating+effects+of+input+iconicity%2C+especially%0Ain+interpolating+CP+to+untrained+regions+of+the+continuum.+Once+similarity+space+has+been+%22warped%22+in%0Athis+way%2C+the+compressed+and+separated+%22chunks%22+have+symbolic+labels+which+could+then+be+combined%0Ainto+symbol+strings+that+constitute+propositions+about+objects.+The+meanings+of+such+symbolic%0Arepresentations+would+be+%22grounded%22+in+the+system's+capacity+to+pick+out+from+their+sensory%0Aprojections+the+object+categories+that+the+propositions+were+about.+&rft.publisher=Academic+Press&rft.contributor=Honavar%2C+V.&rft.contributor=Uhr%2C+L.&rft.date=1995&rft.type=Book+Chapter&rft.type=NonPeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F1596%2F1%2Fharnad95.cpnets.html&rft.identifier=++Harnad%2C+Stevan+and+Hanson%2C+Stephen+J.+and+Lubin%2C+Joseph++(1995)+Learned+Categorical+Perception+in+Neural+Nets%3A+Implications+for+Symbol+Grounding.++%5BBook+Chapter%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1596%2F