Abstract
Two gorillas (Gorilla gorilla) were trained on a series of two-dimensional problems, each problem involving an extradimentsional shift after original learning, then an intradimensional shift, followed by another extradimensional shift. The results indicated that during the early problems the subjects appeared to solve the problems as independent subproblems, i.e., using non-conceptual behavior. However during the last two or three problems the subjects appeared to shift to a conceptual mode of behavior. These data are interpreted as further evidence of the cognitive capacity of the gorilla.
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