見越し反応課題における学習効果について : 予測時間およびβ波帯域を指標としての検討

抄録

  In this study, we examined learning effect through the practice of the coincidence-anticipation timing task using absolute error and beta bands during the task. In this task, a partly masked stimulus runway was used. Twelve healthy right-handed adult volunteers were asked to press a holding pushbutton using the right thumb when the downward moving visual target arrived at the end during the task. Subjects practiced the task for ten days. Continuous electroencephalogram was recorded during the task in the pre-practice and the post-practice. The electroencephalograms were subjected to fast Fourier transform in order to produce the power density in beta bands (13-30 Hz). The power in beta bands was expressed as a percentage of total power (3-30 Hz) in three segments: the visible section, the first half of the masked section, and the second half of the masked section.

  In the results, compared to the pre-practice, absolute error was significantly decreased during the task in the post-practice. In addition, compared to the pre-practice, the percentage of beta bands was significantly decreased in the inferior frontal gyrus, the temporal cortex and increased in the premotor cortex during the task in the post-practice. We conclude that there is a relationship increased the percentage of beta bands in the premotor cortex during the task and learning effect.