選択課題に伴う事象関連電位の変動

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Event-related potentials(ERPs)were recorded from 9 normal subjects engaged in a somatosensory target discrimination task.Subjects were instructed(1)to keep a mental count of each target or(2)to rotate a grip in the direction of abduction after each target stimulus using the right hand.Target stimuli were electrical pulses delivered randomly through ring electrodes to the left second digit with probabilities of 0.2, and nontarget stimuli were delivered to the left fifth digit with probabilities of 0.8.P100 was prominent in somatosensory tasks, and had a widespread distribution on the scalp without having any relation to kinds of tasks, therefore, P100 reflects the sensation of somatosensory stimulation.N140 was largest at Fz in both counting and movement tasks, so our result supported the hypothesis that N140 is generated in the frontal lobes regions.Moreover, N140 letency was shorter during movement than during counting.These results indicate that N140 is related to carrying out movement.P300 was largest at Cz during counting, and largest at Pz and C4' during movement.These results also indicate that P300 may have multiple intracerebral generators since P300 origin differs based on the kind of tasks or stimuli.In addition, the appearance of P300 after nontarget stimuli indicates that P300 reflects a non-selective postdecision closure of cognitive activity.In conclusion, each component of ERPs may have a specific origin and specific characteristics.
日本体力医学会の論文
1997-08-01

選択課題に伴う事象関連電位の変動

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