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Science 24 November 1978:
Vol. 202. no. 4370, pp. 903 - 905
DOI: 10.1126/science.202.4370.903
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Articles

Paper-Marking Test for Chimpanzee: Simple Control for Social Cues

DAVID PREMACK 1, GUY WOODRUFF 2, and KEITH KENNEL 2

1 Department of Psychology, University of Pennsylvania, Philadelphia 19174
2 University of Pennsylvania Primate Facility, Honey Brook 19344

A series of paper-marking tests, modeled after tests widely applied to humans, was administered to Sarah, a "language"-trained chimpanzee (Pan troglodytes). The test format was simple, economical, and controlled for social cues. The ape successfully made same-similar-different judgments on pictures of familiar objects when up to four questions were presented at the same time. Performance remained satisfactory on same-different judgments of novel pictures of alphabetic characters. Throughout the series of tests, the subject showed a superiority on same judgments.

Submitted on February 13, 1978


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Conservation of Liquid and Solid Quantity by the Chimpanzee.
G. WOODRUFF, D. PREMACK, and K. KENNEL (1978)
Science 202, 991-994
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