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Science 23 October 1998:
Vol. 282. no. 5389, pp. 746 - 749
DOI: 10.1126/science.282.5389.746
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Reports
Ordering of the Numerosities 1 to 9 by Monkeys
Elizabeth M. Brannon,
Herbert S. Terrace
A fundamental question in cognitive science is whether animals can
represent numerosity (a property of a stimulus that is defined by the
number of discriminable elements it contains) and use numerical
representations computationally. Here, it was shown that rhesus monkeys
represent the numerosity of visual stimuli and detect their ordinal
disparity. Two monkeys were first trained to respond to exemplars of
the numerosities 1 to 4 in an ascending numerical order (1  2 3 4). As a control for non-numerical cues, exemplars were varied with
respect to size, shape, and color. The monkeys were later tested,
without reward, on their ability to order stimulus pairs composed of
the novel numerosities 5 to 9. Both monkeys responded in an ascending
order to the novel numerosities. These results show that rhesus monkeys
represent the numerosities 1 to 9 on an ordinal scale.
E. M. Brannon, Department of Psychology, Columbia University,
New York, NY 10027, USA. H. S. Terrace, Departments of
Psychology and Psychiatry, Columbia University, New York, NY 10027, USA. E-mail: liz{at}psych.columbia.edu; terrace{at}columbia.edu
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