単純反応課題およびオドボール課題時の脳活動様式の比較

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  • Comparison of the cerebral activity between a simple reaction task and an oddball task: a study of beta band
  • 単純反応課題およびオドボール課題時の脳活動様式の比較--β波成分からの検討
  • タンジュン ハンノウ カダイ オヨビ オドボール カダイジ ノ ノウ カツドウ ヨウシキ ノ ヒカク ベータハ セイブン カラ ノ ケントウ
  • ―<i>β</i>波成分からの検討―

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<p>  We investigated that the beta band, a frequency component of electroencephalogram (EEG), shows chronological changes in cerebral information processing during a simple reaction task and an oddball task that used a visual stimulus. The cerebral activity patterns in both the tasks were compared and analyzed in order to demonstrate the discrimination and differences in information processing. Fifteen right-handed healthy subjects participated in the study. The subjects were instructed to press a button with the right thumb as quickly as possible when a target stimulus was presented from a computer display. The EEG was recorded from the scalp using 128 channels, and was then filtered for the beta band (13-30 Hz). The chronological changes in the beta band in the left and right cerebral cortices showed characteristic activity patterns. Initially, the activity reached the visual cortex from the visual stimulus, and then it was transmitted to the temporal and the parietal association areas. Finally, the activity was transmitted from these areas to the frontal association area. The activities of these pathways occurred repetitively twice during the simple reaction task and thrice during the oddball task. The frequencies of activity in all the association areas were higher in the oddball task than in the simple reaction task, and the rate of increase in the activities in both the frontal association areas was remarkable. These results suggest that repeated activities of visual streams reflect visual information processing, and higher cognition of figures is possible if this activity increases. In addition, the frontal association areas are important for discrimination.</p>

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