?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Categorical+Perception+Effects+Induced+by+Category+Learning&rft.creator=Livingston%2C+Kenneth&rft.creator=Andrews%2C+Janet&rft.creator=Harnad%2C+Stevan&rft.subject=Perceptual+Cognitive+Psychology&rft.description=We+test+whether+effects+similar+to+those+observed+in+the+innate+categorical+perception+(CP)+of+color+and+phonemes+are+induced+during+the+learning+of+both+simple+unidimensional+categories+and+more+complex+multidimensional+ones.+In+Experiment+1+no+evidence+is+found+for+such+effects+when+stimuli+vary+unidimensionally.+Experiments+2+and+3+demonstrate+a+within-category+compression+effect+but+no+between-category+expansion+effect+for+stimuli+varying+in+two+dimensions.+Compression+only+is+also+shown+in+Experiment+4%2C+which+uses+pictures+of+actual+objects.+MDS+analyses+of+these+data+illustrate+how+within-category+compression+effects+without+expansion+effects+are+sufficient+to+produce+categorical+clustering+of+items+in+the+similarity+space.+These+analyses+also+show+that+learning+changes+the+dimensional+structure+of+similarity+space.+Results%0Aare+compared+with+those+from+other+studies+exploring+similar+phenomena%2C+and+with+neural+network+simulations.+The+paper+closes+with+suggestions+for+the+direction+of+future+research+on+these+phenomena.%0A&rft.date=1998&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F2574%2F1%2Fharnad98.cp.pdf&rft.identifier=++Livingston%2C+Kenneth+and+Andrews%2C+Janet+and+Harnad%2C+Stevan++(1998)+Categorical+Perception+Effects+Induced+by+Category+Learning.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F2574%2F