?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Psychophysical+and+cognitive+aspects+of+categorical+perception%3A+A+critical+overview&rft.creator=Harnad%2C+Stevan&rft.subject=Perceptual+Cognitive+Psychology&rft.subject=Psychophysics&rft.description=Categorization+is+a+very+basic+cognitive+activity.+It+is+involved+in%0A+++++++++++++++++++++++++++++++any+task+that+calls+for+differential+responding%2C+from+operant+discrimination+to%0A+++++++++++++++++++++++++++++++pattern+recognition+to+naming+and+describing+objects+and+states-of-affairs.%0A+++++++++++++++++++++++++++++++Explanations+of+categorization+range+from+nativist+theories+denying+that+any%0A+++++++++++++++++++++++++++++++nontrivial+categories+are+acquired+by+learning+to+inductivist+theories+claiming%0A+++++++++++++++++++++++++++++++that+most+categories+are+learned.+%22Categorical+perception%22+(CP)+is+the+name%0A+++++++++++++++++++++++++++++++given+to+a+suggestive+perceptual+phenomenon+that+may+serve+as+a+useful%0A+++++++++++++++++++++++++++++++model+for+categorization+in+general%3A+For+certain+perceptual+categories%2C%0A+++++++++++++++++++++++++++++++within-category+differences+look+much+smaller+than+between-category%0A+++++++++++++++++++++++++++++++differences+even+when+they+are+of+the+same+size+physically.+For+example%2C+in%0A+++++++++++++++++++++++++++++++color+perception%2C+differences+between+reds+and+differences+between+yellows%0A+++++++++++++++++++++++++++++++look+much+smaller+than+equal-sized+differences+that+cross+the+red%2Fyellow%0A+++++++++++++++++++++++++++++++boundary%3B+the+same+is+true+of+the+phoneme+categories+%2Fba%2F+and+%2Fda%2F.+Indeed%2C%0A+++++++++++++++++++++++++++++++the+effect+of+the+category+boundary+is+not+merely+quantitative%2C+but+qualitative.&rft.publisher=Cambridge+University+Press&rft.contributor=Harnad%2C+Stevan&rft.date=1987&rft.type=Book+Chapter&rft.type=NonPeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F1571%2F1%2Fharnad87.cpreview.html&rft.identifier=++Harnad%2C+Stevan++(1987)+Psychophysical+and+cognitive+aspects+of+categorical+perception%3A+A+critical+overview.++%5BBook+Chapter%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1571%2F