動視標の移動方向の違いによるタイミング制御に関与する脳活動の検討

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  • Study of the brain activity related to timing control by using moving visual targets with different directions of motion
  • ドウシヒョウ ノ イドウ ホウコウ ノ チガイ ニ ヨル タイミング セイギョ ニ カンヨスル ノウ カツドウ ノ ケントウ

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<p>  In order to determine how the direction of motion of a moving visual target influences the brain activity related to timing control, we examined the pattern in which brain wave components occurred in the cerebral cortex of humans during 2 timing control tasks in which the direction of motion of a moving visual target differed. The subjects were 6, healthy, right-handed adults. We used 2 tasks: the anticipation of timing task with target that moves from the right to the left (timing task), and the reverse of this task, i.e., with a target that moves from the left to the right (reversed timing task). The target was displayed on a computer monitor placed approximately 1.3 m away from the subject. Electroencephalograms (EEGs) were recorded using electrodes placed at 128 sites on the scalp. The EEGs were separated into frequency bands of the alpha and beta components by using fast Fourier transform (FFT) analysis, and these bands were then analyzed. In addition, the alpha and beta components were compared between the timing task and reversed timing task at each of 18 sites selected according to the international 10/20 system excluding Cz. We observed a decrease in the alpha component and an increase in the beta component in the left frontal area during the reverse timing task. We consider that this activity reflects ocular movement to the right side. Moreover, a significant difference between the 2 tasks was observed with regard to the right posterotemporal area that was related to prediction, and this suggested that the posterotemporal area was related to timing control for visual stimuli.</p>

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