Lever pressing of two chimpanzees in a competitive/cooperative situation

概要

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A lever was set on one side of a cage, where two chimpanzees (Pan troglodytes) lived, widely separated from a magazine which was set on the opposite side of the cage. Ten lever-pressing responses provided a raisin in the magazine. A 30-min session was given from one to three times a day (Experiment 1), 16 times continuously in a day (Experiment 2), and in a situation with a longer distance between the lever and the magazine (Experiment 3). Although they behaved altruistically in earlier sessions, a dominant chimpanzee finally monopolized both the lever and the magazine. The long-time session and the long-distance sessions did not eventually affect the monopoly. 'Negotiations' played an important role in making the monopoly. The results were discussed in terms of effectiveness of social control on the other individual's behavior.
日本霊長類学会の論文