Kinoshita Atsushi, Hiraoka Koichi
a Graduate School of Comprehensive Rehabilitation , Osaka Prefecture University , Habikino city , Osaka , Japan.
b College of Health and Human Sciences , Osaka Prefecture University , Habikino city , Osaka , Japan.
Somatosens Mot Res. 2018 Sep-Dec;35(3-4):183-191. doi: 10.1080/08990220.2018.1521789.
The present study investigated whether the deviation of the performed movement cycle from the required cycle during polyrhythmic bimanual (BM) movement depends on the loci of the visual cues that guide the rhythm of finger movements. Twelve healthy right-handed males rhythmically abducted and adducted the index finger or index fingers with the rhythm of the visual cues. During UM movement, the visual cue guiding the rhythm of finger movement was provided in the left or right visual hemifield. During 2:3 polyrhythmic BM movement, two visual cues, one guiding the rhythm of the left finger movement and another guiding the rhythm of the right finger movement, were provided in a single visual hemifield, or each visual cue guiding each finger movement was provided in each visual hemifield. During polyrhythmic BM movement, the cycle duration of the slower side of the movement guided by the rhythm of the visual cues provided in one visual hemifield was shorter than the required cycle duration, and the magnitude of the shortage in this condition was greater than that guided by each visual cue provided in each visual hemifield. Slower side of the movement is more precisely performed by each visual cue guiding each finger movement in each visual hemifield rather than that guided by visual cues provided in one visual hemifield during polyrhythmic BM movement. This may be explained by bottle-neck model in which visual information overflows the processing capacity when two visual processes are simultaneously provided in a single visual cortex.
本研究调查了在多节奏双手（BM）运动过程中，所执行的运动周期与所需周期的偏差是否取决于引导手指运动节奏的视觉线索的位置。12名健康的右利手男性随着视觉线索的节奏有节奏地外展和内收食指。在单手运动期间，引导手指运动节奏的视觉线索在左或右视觉半视野中提供。在2:3多节奏BM运动期间，两个视觉线索，一个引导左手手指运动的节奏，另一个引导右手手指运动的节奏，在单个视觉半视野中提供，或者引导每个手指运动的每个视觉线索在每个视觉半视野中提供。在多节奏BM运动期间，由一个视觉半视野中提供的视觉线索的节奏引导的运动较慢一侧的周期持续时间比所需周期持续时间短，并且在这种情况下的短缺幅度大于由每个视觉半视野中提供的每个视觉线索引导的幅度。在多节奏BM运动期间，运动较慢的一侧由每个视觉半视野中引导每个手指运动的每个视觉线索比由一个视觉半视野中提供的视觉线索引导的更精确地执行。这可以用瓶颈模型来解释，即在单个视觉皮层中同时提供两个视觉过程时，视觉信息会溢出处理能力。
