Shirai N, Kanazawa S, Yamaguchi M, 2007, "Differential development of radial and rotational motions in early infancy" Perception 36 ECVP Abstract Supplement
Differential development of radial and rotational motions in early infancy
N Shirai, S Kanazawa, M Yamaguchi
Our previous studies have indicated that sensitivities to radial (Shirai et al, 2005 Perception 34 Supplement, 226) and rotational (Shirai et al, 2006 Journal of Vision 6 290s) motion increase between 2 and 3 months of age. We expanded our previous results and directly compared the sensitivities to radial motion (expansion and contraction) and rotational motion (clockwise and counterclockwise) in infants aged 2 and 3 months. Eighty 2- and 3-month-old infants were tested. We presented a pair of optic flow patterns (radiation vs translation or rotation vs translation) to the infants. We measured the infants preference for radial (or rotational) motion over translations by the preferential looking method. Sensitivity to radial expansion was higher than for the other three motions both in the 2- and 3-month-olds, and the expansion bias was greater in the 3-month-olds than in the 2-month-olds. The relation between the expansion bias and development of some cortical systems is discussed.
[Supported by Japan Science and Technology Agency (to MKY), and Japan Society for the Promotion of Science (to NS).]
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