Spontaneous logicomathematical constructions by chimpanzees (Pan troglodytes, P. paniscus) |
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| Authors: | P Potì J Langer S Savage-Rumbaugh K E Brakke |
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| Institution: | (1) Istituto di Psicologia, C. N. R., Reparto di Psicologia Comparata, Via Ulisse Aldrovandi, 16/B, 00197 Rome, Italy e-mail: Patrizia@pml.it, Tel.: +39/063221252, Fax: +39/063217090, IT;(2) University of California at Berkeley, California, USA, US;(3) Language Research Center, Georgia State University, Altlanta, Georgia, USA, US;(4) Georgia State University, Atlanta, Georgia, USA, US |
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| Abstract: | Two experiments investigated the spontaneous construction of precursory logicomathematical operations by human-enculturated
and language-reared chimpanzees (Pan troglodytes, Pan paniscus) when they were interacting freely with objects. In experiment 1, three chimpanzees ranging in age from 6 to 18 years were
presented with sets of six objects. Chimpanzees constructed equivalence, order and reversibility relations within single sets
of objects as well as between two or three contemporaneous sets of objects. The chimpanzees’ logicomathematical operations
were more advanced, including infrequent and minimal operations on three sets, than those of some previously investigated
younger nonenculturated common chimpanzees. In experiment 2, six chimpanzees ranging in age from 6 to 21 years were presented
with sets of 12 objects. Chimpanzees constructed more advanced operations on single sets, but not on contemporaneous sets.
The results suggest partial convergence and partial divergence between development of logicomathematical cognition in chimpanzees
and humans.
Received: 20 January 1999 / Accepted after revision: 9 August 1999 |
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| Keywords: | Common chimpanzees Bonobos One-one ?correspondence Logicomathematical cognition Reversibility |
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