?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=From+Robotic+Toil+to+Symbolic+Theft%3A+Grounding+Transfer+from+Entry-Level+to+Higher-Level+Categories&rft.creator=Cangelosi%2C+Angelo&rft.creator=Greco%2C+Alberto&rft.creator=Harnad%2C+Stevan&rft.subject=Cognitive+Psychology&rft.subject=Neural+Nets&rft.description=Neural+network+models+of+categorical+perception+(compression+of+within-category+similarity%0Aand+dilation+of+between-category+differences)+are+applied+to+the+symbol-grounding+problem%0A(of+how+to+connect+symbols+with+meanings)+by+connecting+analog+sensorimotor+projections+to%0Aarbitrary+symbolic+representations+via+learned+category-invariance+detectors+in+a+hybrid%0Asymbolic%2Fnonsymbolic+system.+Our+nets+are+trained+to+categorize+and+name+50x50+pixel%0Aimages+(e.g.%2C+circles%2C+ellipses%2C+squares+and+rectangles)+projected+onto+the+receptive+field+of+a%0A7x7+retina.+They+first+learn+to+do+prototype+matching+and+then+entry-level+naming+for+the+four%0Akinds+of+stimuli%2C+grounding+their+names+directly+in+the+input+patterns+via+hidden-unit%0Arepresentations+(%22sensorimotor+toil%22).+We+show+that+a+higher-level+categorization+(e.g.%2C%0A%22symmetric%22+vs.+%22asymmetric%22)+can+learned+in+two+very+different+ways%3A+either+(1)+directly%0Afrom+the+input%2C+just+as+with+the+entry-level+categories+(i.e.%2C+by+toil)%2C+or+(2)+indirectly%2C+from%0Aboolean+combinations+of+the+grounded+category+names+in+the+form+of+propositions+describing%0Athe+higher-order+category+(%22symbolic+theft%22).+We+analyze+the+architectures+and+input%0Aconditions+that+allow+grounding+(in+the+form+of+compression%2Fseparation+in+internal+similarity%0Aspace)+to+be+%22transferred%22+in+this+second+way+from+directly+grounded+entry-level+category%0Anames+to+higher-order+category+names.+Such+hybrid+models+have+implications+for+the%0Aevolution+and+learning+of+language.&rft.date=2000&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpostscript&rft.identifier=http%3A%2F%2Fcogprints.org%2F1647%2F2%2Fcangelosi-connsci2.ps&rft.identifier=++Cangelosi%2C+Angelo+and+Greco%2C+Alberto+and+Harnad%2C+Stevan++(2000)+From+Robotic+Toil+to+Symbolic+Theft%3A+Grounding+Transfer+from+Entry-Level+to+Higher-Level+Categories.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1647%2F