Klimesch Wolfgang, Hanslmayr Simon, Sauseng Paul, Gruber Walter R, Doppelmayr Michael
Department of Physiological Psychology, University of Salzburg, Hellbrunnerstrasse 34, A-5020 Salzburg, Austria.
J Neurophysiol. 2007 Feb;97(2):1311-8. doi: 10.1152/jn.00876.2006. Epub 2006 Dec 13.
The hypothesis is tested whether the P1 of the event-related potential (ERP) component behaves like an evoked, traveling alpha wave. This hypothesis is based on different kinds of evidence showing, e.g., that-after undergoing phase reorganization-frequencies in the broad alpha range become synchronized (aligned) in absolute phase and contribute significantly to the generation of the P1. We investigated data from a Stroop task in which subjects had to respond only to the color and ignore the meaning of the presented words. Analyzing topographical phase relationships expressed in terms of traveling speed (with respect to Pz as trailing site) revealed that a systematic posterior to anterior traveling pattern appeared only in the broad time window of the P1-N1 complex and in the extended alpha frequency range. The obtained findings are consistent with the oscillatory ERP model and suggest that the P1 component may be considered a manifestation of an evoked, traveling alpha wave. We assume that the P1 reflects a top-down process in a sense that traveling alpha waves control or "gate" the direction of information processing in the brain.
对事件相关电位（ERP）成分的P1是否表现得像诱发的、移动的阿尔法波这一假设进行了检验。该假设基于不同类型的证据，例如，在经历相位重组后，广泛阿尔法范围内的频率在绝对相位上变得同步（对齐），并对P1的产生有显著贡献。我们研究了来自Stroop任务的数据，在该任务中，受试者必须只对颜色做出反应，而忽略所呈现单词的含义。分析以移动速度（相对于Pz作为尾随部位）表示的地形相位关系发现，仅在P1 - N1复合体的宽泛时间窗口和扩展的阿尔法频率范围内出现了从后向前的系统性移动模式。所获得的结果与振荡ERP模型一致，并表明P1成分可被视为诱发的、移动的阿尔法波的一种表现。我们假设，从移动的阿尔法波控制或“门控”大脑中信息处理方向的意义上来说，P1反映了一种自上而下的过程。
