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[文献書誌] Tomonaga,Masaki: "Visual texture segregation by the chimpanzee(Pan troglodytes)"Behavioural Brain Research. 99. 209-218 (1999)
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[文献書誌] Tomonaga,Masaki: "Global-local processing in humans (Homo Sapiens) and chimpanzees(Pan troglodytes) : Use of a visual search task with compound stimuli"Journal of Comparative Psychology. 113. 3-12 (1999)
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[文献書誌] Tomonaga,Masaki: "Establishing functional classes in a chimpanzee(Pan troglodytes) with a 2-item sequential-responding procedure"Journal of the Experimental Analysis of Behavior. 72. 57-79 (1999)
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[文献書誌] Tomonaga,Masaki: "Inversion effect in perception of human faces in a chimpanzee(Pan troglodytes)"Primates. 40. 417-438 (1999)
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[文献書誌] Tomonaga,Masaki: "Perception des dimensions globales et locales de stimuli visuels chez le primate"Primatologie. 2. 61-77 (1999)
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[文献書誌] 友永 雅己: "チンパンジーにおける顔の方向の知覚-視覚探索課題を用いて"霊長類研究. 9. 215-229 (1999)
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[文献書誌] 渡辺茂(編) 友永雅己著: "「心と比較認知科学」(ことばと心の発達(3))"ミネルヴァ書房. 448 (2000)