3 male squirrel monkeys were tested for visual preferences among another monkey, a toy snake, or an empty cage. The sight of another monkey was preferred to either of the other stimuli. The response shows little habituation but undergoes fairly rapid extinction.
References
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ButlerR. A.Incentive conditions which influence visual exploration. Journal of Expertmental Psychology, 1954, 48, 19–23.
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ButlerR. A.AlexanderH. M.Daily pattern of visual exploratory behavior in the monkey. Journal of Comparative and Physiological Psychology, 1955, 48, 247–249.
