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  • Title: Japanese monkeys' cardiac responses to visual depth.
    Author: Hayashibe K, Hara M, Tsuji K, Matsuzawa T.
    Journal: Percept Mot Skills; 1988 Aug; 67(1):303-10. PubMed ID: 3211685.
    Abstract:
    The present study examined the heart-rate changes which occurred in the visual-depth situation of Japanese monkeys (Macaca fuscata). Four animals were tested over the first four weeks of age in the visual pitfall designed as a modification of the visual cliff. The infant monkeys showed heart-rate reduction in the depth condition. This reduction was observed from the first week and became remarkable at the third week. There were no differences in heart-rate change between monocular and binocular vision. These findings suggest that the Japanese monkey can discriminate visual depth shortly after birth and that the heart-rate reduction depends upon the fear of visual depth, not upon the novelty of the situation.
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