There is trial-to-trial variability in the reaction time to stimulus presentation. Since this variability exists even in an identical stimulus condition, it reflects the internal neural dynamics of the brain. To understand the neural dynamics that influence the reaction time, we conducted an electroencephalogram (EEG) experiment in which participants were asked to press a response button as quickly as possible when a stimulus was visually presented. Phase-locking factor analysis revealed that phase resetting in two frequency bands, which appeared 0.2 s after the stimulus presentation, characterized the reaction time. The combination of the theta band phase resetting in the left parietal region and the delta band phase resetting mainly in the posterior region was associated with the fastest reaction time, whereas delta band phase resetting without theta band phase resetting was associated with the faster reaction time. The results indicated that there were frequency-dependent effects in the relationships between the EEG phase resetting and reaction time.

对刺激呈现的反应时间存在不同试验之间的差异。由于这种可变性即使在相同的刺激条件下也存在，它反映了大脑的内部神经动力学。为了了解影响反应时间的神经动力学，我们进行了一项脑电图 (EEG) 实验，其中要求参与者在视觉上呈现刺激时尽快按下响应按钮。锁相因子分析表明，在刺激呈现后 0.2 秒出现的两个频段的相位重置表征了反应时间。左顶叶区的 theta 带相位重置和主要在后区的 delta 带相位重置的组合与最快的反应时间相关，而没有 theta 波段相位重置的 delta 波段相位重置与更快的反应时间相关。结果表明，EEG 相位重置与反应时间之间的关系存在频率依赖效应。