発話と手指の運動の相互作用

概要

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The present study examined the relationships among cerebral asymmetry, speech, handedness, and attention during performance of dual motor tasks in right-handers. Participants performed three single tasks and two dual tasks. The single tasks were unimanual tapping and speech production. On the dual task, they produced concurrent speech and finger-tapping movements. The participants were divided into three groups by focus of attention on both/either speech and/or tapping. The author observed that while the dual task produced more variable intertap intervals than the simple task, the right hand in the dual task of the speech-focused group showed the most variable interval among all tasks of the three groups, indicating an asymmetric interaction of verbal and manual tasks. On the other hand, the dual task produced a higher performance of both speech and tapping in the tap-focused group, indicating a bidirectional entrainment of speech and hand movement.