The effects of stimulus presentation variable upon chimpanzee's selection of food by size.

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Abstract
Chimpanzees were presented with choices between 2 pieces of food, differing in size. Trials differed with respect to the way in which the pieces were presented before choice (both visible, or only one) and during choice (both or one or neither visible). Choice of the larger piece was most frequent when both prices were visible, although presentation of the larger piece alone led to almost as good performance. However, when the size difference of the pieces was relatively great, differences in performance under the various conditions were not very apparent. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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