Expectancy-related cerebral potentials associated with voluntary time estimation and omitted stimulus.

Y Takasaka
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引用次数: 11

Abstract

Expectancy-related and nonexpectancy-related cerebral potentials associated with stimuli and omitted stimuli were recorded in 7 normal subjects. The stimuli were constantly delivered to the right median nerve and the interstimulus interval was set at 7 seconds. When the subject counted to estimate the interstimulus interval correctly, a slow negative deflection appeared about one second prior to both the stimuli and the omitted stimuli. In the case of the omitted stimulus, this expectancy-related negative potential (ENP) returned to the base line after several hundred msec. When the stimuli were delivered, the amplitude of the P300 was much higher when the subject was paying attention to the stimuli than when he was not. The scalp distribution of the ENP was rather anterior to the P300. No ENP appeared when the subject was not paying attention to the stimuli or the omitted stimuli, or when the stimuli were delivered at a random rate.

期望相关的脑电位与自愿时间估计和省略刺激有关。
记录7名正常受试者与刺激和忽略刺激相关的期望相关和非期望相关脑电位。刺激持续传递至右侧正中神经,刺激间隔为7秒。当被试正确计数以估计刺激之间的间隔时,一个缓慢的负偏转在刺激和被省略的刺激之前大约一秒出现。在省略刺激的情况下,这种与期望相关的负电位(ENP)在几百毫秒后回到基线。当刺激被传递时,受试者注意刺激时P300的振幅要比不注意刺激时高得多。ENP的头皮分布在P300的前部。当受试者不注意刺激或忽略刺激时,或以随机速率传递刺激时,没有ENP出现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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