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Science 23 October 1998:
Vol. 282. no. 5389, p. 589
DOI: 10.1126/science.282.5389.589l
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This Week in Science

Can monkeys count? Brannon and Terrace (p. 746; see the Perspective by Carey) trained two monkeys to use a touch-sensitive screen to order images on the basis of how many items were present. The monkeys would first touch the image containing one item (a geometric shape of varying color and size on a background of varying color, or even a piece of clip art), then the image containing two items, and so forth up to four items. When presented with pairs of images each containing between five and nine items, the monkeys could select the image with more items.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)