Development of visuomotor representations for hand movement in young children.

摘要: The stability and adaptability of visuomotor representations for hand movement in young children was investigated using a adaptation paradigm which the real-time visual feedback pen rotated 45 degrees clockwise during exposure trials. Four, six, eight-year-old performed line drawings to targets, from common centered position ("center-out task"), horizontal plane under normal (pre-, post-exposure), (exposure) conditions. Analysis pre-exposure trials indicated that older faster, straighter, smoother, showed more patterned movements than younger children. Initial direction movement, computed at 80 ms after onset, progressive tuning with increasing age. On introduction screen cursor rotation, all age group improvement their planning (initial directional error) execution (movement time, length, root mean square error, normalized jerk) error scores early late-exposure trials, but 4-year-olds were less affected by distortion period. Moreover, only oldest significant after-effects post-exposure indicating this learned internal model distorted environment. absence initial observed two groups suggest these might have developed (i.e. broad) movements, are sharpened tuned) experience.