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Klüver's monograph extends research on animal behavior to new and extremely interesting problems. His work is noteworthy for the excellent technics he uses, and particularly for the "method of equivalent stimuli," which consists essentially of establishing a differential response to one set of stimuli and introducing changes in the stimulus situation with tests to determine whether it is then equivalent or nonequivalent. Among other tests used are various significant experiments in the monkey's use of tools to secure food. Klüver is cautious in interpreting the results, but they represent an advance in the knowledge of behavior mechanisms in monkeys which should receive the careful attention of all students of human as well as of animal behavior. The work shows clearly that the responses of macaque monkeys are much more nearly like those of the anthropoid apes than has usually been supposed. Klüver makes the interesting suggestion that his technics can
Behavior Mechanisms in Monkeys.. Arch NeurPsych. 1935;33(1):245. doi:10.1001/archneurpsyc.1935.02250130251027