Approach-avoidance in an ambivalent object discrimination problem.

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Abstract
Chimpanzees are able to learn an ambivalent object discrimination problem. Three different stimulus plaques were paired in the 3 possible combinations so that each plaque was both positive (rewarded) and negative (unrewarded) in different pairings with each other plaque. The subject had to choose the positive plaque, with the 3 combinations presented in random order. The plaques were presented in the horizontal plane for some subjects, in the vertical plane for others. Transfer tests, consisting of a change in the spatial arrangement of the discriminanda, failed to disturb performance. This indicates that the learned discriminative response is better descr. as approach-avoidance rather than in terms of learned movements.
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