シンコペーション課題における発話と手指の運動の相互作用

概要

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The present study examined interactions of speech production and hand performance, using the syncopated motor task of speech and hand movement in ten right-handers. Participants performed two single tasks and one syncopated task. The single tasks were unimanual tapping movements and speech production (target interresponse interval: 500 ms). On the syncopated task, the participants were required to produce one movement exactly midway between two another movements (target interresponse interval: 250 ms). They were further divided into two groups: the tap-preceding group and speech-preceding group. The author observed that the mean differences between onsets of speech and tapping movement were shorter than 250 ms over all condition (the shortest mean difference 50 ms), suggesting an entrainment of two movements. In the syncopated task of the speech-preceding group, on the other hand, the tapping movement of the right hand showed more variable peak force and intertap interval than that of the left hand, indicating an asymmetrical interference of two movements.
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