Abstract
In order to elaborate the mechanism of development of synchrony pattern suggested by Fujita (1989), the following studies using 2 to 6 year-old children examined how his (or her) own verbalization (V) and hand-arm action (A) came to be integrated within him (or her) self while synchronyzing with an adult's (V) and (A). The main results were as follows;(1) in single-(V) task, 2 to 3 year old children could not inhibit (A) and tended to synchronize their (V) and (A) with adult's (V), and in single-(A) task, all children synchronized only (A) with adult's (A)(Ex. 1); (2) the language system showed a more flexible and stable development than the motor-action system in children (Ex. 1, 2); and (3) when they were required to conbine these two systems in a dual task composed of (V) and (A), children's verbalization was negatively affected and became extinct (Ex.3). These results suggested that the phase-like sequence whereby child's language and motor-action systems progressively came to be integrated through the bidirectional synchrony interaction with adult were different from the one suggested in Luria's paradigm.
