title: Japanese monkeys' cardiac responses to visual depth.
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.
authors.affiliation: Department of Psychology, Faculty of Liberal Arts, Shizuoka University, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Hayashibe
authors.forename: M
authors.initials: M
authors.lastname: Hara
authors.forename: K
authors.initials: K
authors.lastname: Tsuji
authors.forename: T
authors.initials: T
authors.lastname: Matsuzawa
mesh_terms: D000818:Animals; D003867:Depth Perception / Q000502:physiology*; D005106:Exploratory Behavior / Q000502:physiology*; D005239:Fear / Q000502:physiology*; D006339:Heart Rate; D008251:Macaca / Q000502:physiology*; D009043:Motor Activity / Q000502:physiology; D015348:Vision, Binocular / Q000502:physiology; D015349:Vision, Monocular / Q000502:physiology