Gruber Walter R, Zauner Andrea, Lechinger Julia, Schabus Manuel, Kutil Rade, Klimesch Wolfgang
University of Salzburg, Division of Physiological Psychology, Center of Cognitive Neuroscience, Austria.
University of Salzburg, Department of Computer Sciences, Austria.
Neuroimage. 2014 Dec;103:119-129. doi: 10.1016/j.neuroimage.2014.08.055. Epub 2014 Sep 16.
In the present study, we have investigated the influence of ongoing alpha phase on the generation of the P1 component of the visual ERP, recorded in a target detection task. Our hypothesis is that in trials where pre- or peristimulus alpha phase is already aligned in a way that voltage positive alpha peaks develop seamlessly into the P1, detection performance will be enhanced as compared to trials where alpha is not aligned. The findings supported our hypothesis and showed that target detection times for the subset of seamless alpha trials was significantly shorter than for trials that are not seamless. Our findings contradict the evoked model for the generation of early ERP components, which rests on the assumption of fixed latency, fixed polarity components. We found that in the non-seamless trials the 'candidate' component of the single trial P1 was at the opposite polarity. Despite this fact, alpha phase locking was at the same high level as was observed for the seamless trials. Finally, we found that prestimulus alpha phase was aligned already in a time window preceding the P1 by 400ms.
在本研究中，我们调查了持续的阿尔法相位对视觉事件相关电位（ERP）P1成分产生的影响，该电位是在目标检测任务中记录的。我们的假设是，在刺激前或刺激时阿尔法相位已经以电压正阿尔法峰值无缝发展为P1的方式对齐的试验中，与阿尔法未对齐的试验相比，检测性能将得到增强。研究结果支持了我们的假设，并表明无缝阿尔法试验子集的目标检测时间明显短于非无缝试验。我们的发现与早期ERP成分产生的诱发模型相矛盾，该模型基于固定潜伏期、固定极性成分的假设。我们发现，在非无缝试验中，单次试验P1的“候选”成分具有相反的极性。尽管如此，阿尔法相位锁定与无缝试验中观察到的水平相同。最后，我们发现刺激前阿尔法相位在P1之前400毫秒的时间窗口内就已经对齐。
