Orienting Responses to Visual and Auditory Stimuli in Normal and Down Syndrome Neonates

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  • 健常およびダウン症新生児の視、聴覚刺激に対する定位反応の発達心理学的研究
  • ケンジョウ オヨビ ダウンショウ シンセイジ ノ シ チョウカク シゲキ ニ

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Abstract

This study analyzes the development of the orienting response to visual and auditory stimuli in normal and Down Syndrome neonates (1-36 days). Nine normal and five Down Syndrome neonates were tested in hospital or home each two to six days during the first 36 days following birth. Visual (penlight) and auditory stimuli (buzzer) were presented five times on the eyes and to the auditory meatus. Findings suggest that in normal neonates (0-28 days), three developmental stages of the orienting response can be identified in normal neonates in comparison with one period (1-7 days) being observed in Down Syndrome neonates of the same age. The study's findings enable these periods to be categorized as the development of the defensive reflex, the development of the orienting response (14-21 days), and the maturation of the orienting response (21-28 days).

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