Numerical memory span in a chimpanzee

Nobuyuki Kawai and Tetsuro Matsuzawa ()
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Nobuyuki Kawai: Primate Research Institute, Kyoto University
Tetsuro Matsuzawa: Primate Research Institute, Kyoto University

Nature, 2000, vol. 403, issue 6765, 39-40

Abstract: Abstract A female chimpanzee called Ai has learned to use Arabic numerals to represent numbers1. She can count from zero to nine items, which she demonstrates by touching the appropriate number on a touch-sensitive monitor2,3, and she can order the numbers from zero to nine in sequence4,5,6. Here we investigate Ai's memory span by testing her skill in these numerical tasks, and find that she can remember the correct sequence of any five numbers selected from the range zero to nine.

Date: 2000
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DOI: 10.1038/47405

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