Stereotyped Behavior and Cage Size

Abstract
Twelve feral adolescent rhesus monkeys were observed individually during 10 5-min. periods in each of three different-sized cages. Stereotyped and cage-oriented behavior occurred most frequently in the small cage, sometimes in the medium cage, but never in the large cage. It was concluded that spatial restriction which does not permit "normal" locomotor behavior, e.g., running, climbing, etc., results in substitute motor expression which frequently takes the form of repetitive stereotyped movements.

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