Asymmetrical Cortical Processing of Radial Expansioncontraction in Infants and Adults

Autor/inn/en	Shirai, Nobu; Birtles, Deirdre; Wattam-Bell, John; Yamaguchi, Masami K.; Kanazawa, So; Atkinson, Janette; Braddick, Oliver
Titel	Asymmetrical Cortical Processing of Radial Expansioncontraction in Infants and Adults
Quelle	In: Developmental Science, 12 (2009) 6, S.946-955 (10 Seiten) PDF als Volltext Verfügbarkeit
Sprache	englisch
Dokumenttyp	gedruckt; online; Zeitschriftenaufsatz
ISSN	1363-755X
DOI	10.1111/j.1467-7687.2009.00839.x
Schlagwörter	Neurological Organization; Infants; Motion; Syntax; Brain Hemisphere Functions; Adults; Visual Stimuli; Comparative Analysis; Age Differences; Child Development; Developmental Stages + Suchen Sie Ihr Suchwort? Infant; Toddler; Toddlers; Kleinkind; Bewegungsablauf; Age; Difference; Age difference; Altersunterschied; Kindesentwicklung
Abstract	We report asymmetrical cortical responses (steady-state visual evoked potentials) to radial expansion and contraction in human infants and adults. Forty-four infants (22 3-month-olds and 22 4-month-olds) and nine adults viewed dynamic dot patterns which cyclically (2.1 Hz) alternate between radial expansion (or contraction) and random directional motion. The first harmonic (F1) response in the steady-state VEP response must arise from mechanisms sensitive to the global radial motion structure. We compared F1 amplitudes between expansion-random and contraction-random motion alternations. F1 amplitudes for contraction were significantly larger than those for expansion for the older infants and adults but not for the younger infants. These results suggest that the human cortical motion mechanisms have asymmetrical sensitivity for radial expansion vs. contraction, which develops at around 4 months of age. The relation between development of sensitivity to radial motion and cortical motion mechanisms is discussed. (As Provided).
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Update	2017/4/10