鏡像描写における両側性転移の発達的研究

概要

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Bilateral transfer effect in the mirror-tracing task was examined for 7 age groups. Each group contained 20 <I>S</I>s of mean age 8, 10, 12, 14, 17, 21, 32, respectively. A group of Ss was tested twice with the nonpreferred hand and was divided into matched groups, according to the averaged time score. Ss were tested again with the nonpreferred hand for 6 trials, after 16 trials with the preferred hand in the experimental group and after a 15-minute rest in the control group, respectively. Performance of the preferred hand initially differed among age groups, but the difference disappeared as the trials proceeded. By a comparison of learning curves of the nonpreferred hand between experimental and control groups, it was clearly shown that the gain of performance was remarkable between the second and the third trials in the experimental group. Thus, the bilateral transfer effect was demonstrated for all of the 7 age groups. The amount of positive transfer was 50% in the 8-year group and was reduced to 20% in the 12- and 14-year groups, keeping a constant level of 25% thereafter.