基礎心理学研究
Online ISSN : 2188-7977
Print ISSN : 0287-7651
ISSN-L : 0287-7651
Development of asymmetrical cortical responses to radial expansion/contraction(Summary of Awarded Presentation at the 25th Annual Meeting)
Nobu SHIRAIDeirdre BIRTLESJohn WATTAM BELLMasami YAMAGUCHI KSo KANAZAWAJanette ATKINSONOliver BRADDICK
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2007 年 25 巻 2 号 p. 275-276

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We report the development of cortical responses (steady-state visual evoked potentials: VEPs) to radial expansion/contraction. Forty-four 3-4-month-olds and 9 adults viewed moving dots which cyclically (2.085 Hz) alternated between radial expansion (or contraction) and random directional motion. The first harmonic (F1) response in the VEPs must arise from global-motion- sensitive mechanisms. The results indicated that the F1 amplitudes for contraction were significantly larger than those for expansion for the 4-month-olds and the adults but not for the 3-month-olds. These results suggest that the human cortical motion mechanisms have an asymmetrical sensitivity for radial expansion/contraction which develops at around 3 to 4 months of age.

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© 2007 日本基礎心理学会
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