乳児の身体運動から見る神経機能および認知機能の発達:
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概要
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In order to understand neurological and cognitive development, we observed movement pattern of an infant longitudinally under the two different situations. In the spontaneous movement session, we observed spontaneous movements of the infant. In the mobile session, we studied inter-limb movement patterns when the infant attempted moving a mobile using a string attached to his arm and we tested retention of his learning. The infant was born full-term and he visited our laboratory 7 times from 14 days of age to 165 days of age. We used a 3D motion analysis system to track the 14 markers attached to the infant body. Kinematic analysis of the velocity of infant limbs revealed that mean velocity of the limbs decreased around 2 months of age and it increased after 3 months of age. In addition, active and/or complex movement of limbs after 3 months of age was inhibited when the infant attended to the attractive environmental stimulation. This developmental U-shape pattern of the infant spontaneous movement and the inhibitory control of movement suggest a developmental change of neurological motor control from the central pattern generators (CPGs) to the cerebral cortex. Results of the mobile session indicated that the movement pattern during the learning and the retention tests differed with age of the infant. While a general increase in the movements of all the limbs was observed during younger ages, a specific increase in the movements of the connected arm was observed during older ages. This general to specific development is consistent with the result of Watanabe & Taga (2006)'s cross-sectional study using the mobile paradigm.
- 人間環境学研究会の論文
人間環境学研究会 | 論文
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