Freunberger Roman, Höller Yvonne, Griesmayr Birgit, Gruber Walter, Sauseng Paul, Klimesch Wolfgang
University of Salzburg, Department of Physiological Psychology, Institute of Psychology, Hellbrunnerstr. 34, A-5020 Salzburg, Austria.
Eur J Neurosci. 2008 May;27(9):2330-40. doi: 10.1111/j.1460-9568.2008.06190.x.
The present study attempts to demonstrate functional similarities between the P1 component of event-related potentials and alpha oscillations that are predicted by the 'alpha inhibition-timing' hypothesis. On the basis of findings showing that the frequency characteristic of the P1 component lies in the alpha range and that alpha oscillation is functionally associated with inhibition, we predict that the P1 component also reflects inhibitory processes. This hypothesis is tested in two experiments, a spatial-cuing task and a visual-semantic categorization task. The results of the cuing task demonstrate that in a similar way as alpha power, the P1 component is larger over task-irrelevant ipsilateral sites. For the categorization task, we found that the P1 component, in a similar way to alpha oscillations, is larger for task-irrelevant, distorted pictures. We conclude that the P1 component may be generated at least in part by evoked alpha oscillations and reflects inhibition in the sense of suppressing task-irrelevant processes.
本研究试图证明事件相关电位的P1成分与“α抑制-时间”假说所预测的α振荡之间的功能相似性。基于研究结果表明P1成分的频率特征处于α范围内，且α振荡在功能上与抑制相关，我们预测P1成分也反映抑制过程。该假说在两个实验中进行了检验，一个是空间线索任务，另一个是视觉语义分类任务。线索任务的结果表明，与α功率类似，P1成分在与任务无关的同侧部位更大。对于分类任务，我们发现，与α振荡类似，P1成分对于与任务无关的、扭曲的图片更大。我们得出结论，P1成分可能至少部分由诱发的α振荡产生，并在抑制与任务无关的过程的意义上反映抑制作用。
