Hand preference in capuchin monkeys varies with age |
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Authors: | Gregory Charles Westergaard Stephen J. Suomi |
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Affiliation: | (1) Laboratory of Comparative Ethology, National Institute of Child Health and Human Development, Building 112, NIHAC, P. O. Box 529, 20837 Poolesville, Maryland, USA |
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Abstract: | The purpose of this research was to examine the influence of age on hand preference in capuchin monkeys (Cebus apella). Twenty-two capuchins, aged 6 months to 30 years, were presented with a task that involved reaching for food and a task that involved using sponging tools to absorb juice. Adults exhibited a greater percentage of right-handed actions in each task than did immature subjects. Adults also exhibited a stronger lateral bias than did immature subjects in the sponging task. These results are consistent with hypotheses: a) adult capuchin monkeys are biased toward use of their right hand for reaching; b) adult capuchins exhibit a greater incidence of right-hand preference than do immature capuchins; and c) primates exhibit age-related differences in the strength and direction of hand preference in tasks that involve the use of tools. |
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Keywords: | Capuchin Cebus apella Monkey Hand preference Laterality Tool-use |
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