Asymmetric perception of radial expansion/contraction in Japanese macaque (Macaca fuscata) infants
Nobu Shirai, Tomoko Imura, Yuko Hattori, Ikuma Adachi, Shigeru Ichihara, So Kanazawa, Masami K. Yamaguchi, Masaki Tomonaga
Visual radial expansion/contraction motion provides important visual information that is used to control several adaptive actions. We investigated radial motion perception in infant Japanese macaque monkeys using an experimental procedure previously developed for human infants. We found that the infant monkeys’ visual preference for the radial expansion pattern was greater than that for the radial contraction pattern. This trend towards an “expansion bias” is similar to that observed in human infants. These results suggest that asymmetrical radial motion processing is a basic visual function common to primates, and that it emerges early in life.
Japanese macaque (Macaca fuscata), Radial motion, Asymmetry, Comparative development