Early development of sensitivity to radial motion at different speeds |
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| Authors: | Nobu Shirai So Kanazawa Masami K. Yamaguchi |
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| Affiliation: | (1) Department of Psychology, Tokyo Metropolitan University, 1-1 minamiohsawa, Hachiohji-city, Tokyo 192-0397, Japan;(2) Japan Society for the Promotion of Science, 6 Ichibancho, Chiyoda-ku, Tokyo 102-8471, Japan;(3) Department of Psychology, Shukutoku University, Daiganji 200, Chuo-ku, Chiba-city, Chiba 260-0812, Japan;(4) Department of Psychology, Chuo University, 742-1, Hlgashinakano, Hachiohji-city, Tokyo 192-0393, Japan;(5) PRESTO, Japan Science and Technology Agency, 3-5, Sanbancho, Chiyodaku-ku, Tokyo 102-0075, Japan |
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| Abstract: | We examined the sensitivity of 2- and 3-month-old infants to radial expansion/contraction at various speeds. The stimuli comprised one radial motion pattern (expansion or contraction) and one translational motion pattern (up, down, left or right; counterbalanced across infants) placed side by side. The two patterns in each stimulus had the same speed. Three-month-old infants could discriminate between radiation and translation, even under relatively low speeds (5.31 and 2.66°/s), whereas discrimination between the two patterns by 2-month-old infants was very limited. Thus, the range of speeds at which infants can detect radial expansion/contraction changes extensively between 2 and 3 months of age. This change in radial motion sensitivity may reflect the development of cortical motion mechanisms in the dorsal pathway, which is specialised to detect radial motion. |
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| Keywords: | Dorsal pathway Expansion/contraction Infant vision Motion speed |
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