Title:
Aging, relative numerousness judgments, and summation in Western Lowland gorillas

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Anderson, Ursula S.
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Maple, Terry L.
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Abstract
Three experiments were conducted to evaluate the relation between age, relative numerousness judgments, and summation in Western lowland gorillas. The findings indicated that most of the gorillas did not perform relative numerousness judgments until after specific training to do so. However, the gorillas did perform summation without specific training and an age-related difference was apparent.
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Date Issued
2003-10-30
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