不同手反应对冲突监测事件相关电位N270的影响

Impact of different hands' response on the conflict monitoring event-related potential N270

目的:探讨不同手作业反应对冲突监测事件相关电位N270的影响。方法:要求受试者判断前后呈现的两个刺激颜色是否相同,并做出按键反应,同步从头皮记录事件相关电位。在前一半实验中,受试者用一只手的两个不同手指按键,在后一半实验中,受试者用另一只手按键。结果:当两个刺激的颜色相同时,第2个刺激诱发出了N100、N160、N200和LPC。当两个刺激的颜色不同时,第2个刺激诱发出了N100、N160、N200、LPC和N270。N270主要分布在前头部额中央区。在第2个刺激之前的伴随性负变化(contingentnegativevariation,CNV)在受试者用右手反应时波幅明显增高,但CNV的存在不影响N160、N200和N270的波幅。N160和N200在受试者用左手按键反应时波幅明显增高,而N270的波幅在左右手反应之间无明显区别。结论:冲突监测事件相关电位N270的波幅不受不同手反应的影响。

AIM:To explore the influence of different hands' response on the conflict monitoring event related potential N270.METHODS:Subjects were asked to discriminate whether the two sequentially presented visual stimuli were of the same color while event related potentials were recorded from their scalps. In the first half of the test, subjects used two different fingers of one hand to press the buttons of a pushpad, while they used the other hand in the other half. RESULTS:N270 component was recorded only in the conflict condition mainly on the centra frontal area.The mean amplitude of contingent negative variation (CNV) was significantly higher to the right hand response, and the lasting effect of it did not affect the amplitudes of N160, N200 and N270.The mean amplitudes of N160 and N200 were significantly higher in the left hand response. However, the mean amplitudes of N270 showed no significant difference between left and right hand responses.CONCLUSION:Different hands' response didn't affect the conflict monitoring event related potential N270.