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ERIC Number: EJ830943
Record Type: Journal
Publication Date: 2006-Jan
Pages: 17
Abstractor: As Provided
Reference Count: 40
ISSN: ISSN-1525-0008
The Effect of Heterogeneity on Numerical Ordering in Rhesus Monkeys
Cantlon, Jessica F.; Brannon, Elizabeth M.
Infancy, v9 n2 p173-189 Jan 2006
We investigated how within-stimulus heterogeneity affects the ability of rhesus monkeys to order pairs of the numerosities 1 through 9. Two rhesus monkeys were tested in a touch screen task where the variability of elements within each visual array was systematically varied by allowing elements to vary in color, size, shape, or any combination of these dimensions. We found no evidence of a cost (or benefit) in accuracy or reaction time when monkeys were tested with stimuli that were heterogeneous in color, size, or shape. This was true even though both monkeys experienced extended initial training with arrays that were homogeneous in the color, shape, and size of elements. The implications of this finding for the mechanisms that monkeys use to represent and compare numerosities are discussed. (Contains 6 figures, 3 tables and 3 footnotes.)
Psychology Press. Available from: Taylor & Francis, Ltd. 325 Chestnut Street Suite 800, Philadelphia, PA 19106. Tel: 800-354-1420; Fax: 215-625-2940; Web site:
Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A