?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Species+and+individuals+in+the+perceptual+world+of+monkeys&rft.creator=Humphrey%2C+Nicholas+K&rft.subject=Animal+Cognition&rft.subject=Developmental+Psychology&rft.subject=Perceptual+Cognitive+Psychology&rft.description=When+a+monkey+is+given+the+choice+of+looking+at+a+novel+picture+or+a+blank+white+screen+he+shows+an+initial+preference+for+the+picture+which+usually+abates+within+about+200+seconds%3B+if+the+picture+is+then+changed+for+another+his+preference+revives.+The+level+of+preference+for+the+second+picture+depends+on+the+degree+to+which+it+is+perceived+as+'similar'+to+or+'different'+from+the+first.+This+technique+has+been+used+to+investigate+how+rhesus+monkeys+classify+pictures+of+animals%2C+and+in+particular+the+extent+to+which+they+differentiate+between+individual+animals+of+the+same+species.+Two+classes+of+animal+pictures+were+used%2C+namely+pictures+of+other+rhesus+monkeys+and+pictures+of+domestic+animals.+The+results+indicate+that+inexperienced+monkeys%2C+to+whom+the+domestic+animals+are+unfamiliar%2C+treat+individual+domestic+animals+of+the+same+species+as+being+closely+similar%3B+they+treat+individual+monkeys%2C+on+the+other+hand%2C+as+being+quite+different+from+each+other.+Experienced+monkeys%2C+however%2C+who+have+been+exposed+over+the+course+of+6+months+to+many+further+pictures+of+animals%2C+come+to+treat+all+individuals+as+different+from+each+other%2C+so+that+one+pig%2C+say%2C+is+now+seen+as+being+as+different+from+another+pig+as+is+one+monkey+from+another.&rft.date=1974&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F1777%2F2%2FPerception74.pdf&rft.identifier=++Humphrey%2C+Nicholas+K++(1974)+Species+and+individuals+in+the+perceptual+world+of+monkeys.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1777%2F