Prestimulus oscillations predict between and within subjects
Prestimulus oscillations predict between and within subjects
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DOI：
10.1016/j.neuroimage.2007.07.011
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发表时间：
2007-10-01
期刊：
影响因子：
5.7
通讯作者：
Baeuml, Karl-Heinz
中科院分区：
文献类型：
--
作者：
Hanslmayr, Simon;Aslan, Alp;Baeuml, Karl-Heinz
本研究探讨了感知短时呈现的视觉刺激的电生理相关性。特别是，我们研究了能够分辨四种短时间呈现的刺激的受试者（感知者）和不能分辨的受试者（非感知者）之间在刺激前脑电图上的差异。此外，我们还研究了受试者感知到的试验和未感知到的试验之间的差异。结果显示，感知者比非感知者表现出更低的预刺激α功率。对感知和未感知试验之间的预刺激脑电图分析表明，对刺激的感知与阿尔法频率范围（8-12 赫兹）的低相位耦合和β和γ频率范围（20-45 赫兹）的高相位耦合有关。单次试验分析表明，α、β和γ频率范围内的相位耦合可以预测感知性能。研究结果表明，α 频段的同步振荡会抑制对短时刺激的感知，而较高频率范围（>20 Hz）的同步振荡则会增强视觉感知。我们的结论是，α、β和γ振荡能显示受试者的注意状态，因此能预测单次试验的感知表现。(C) 2007 Elsevier Inc.保留所有权利。
In the present study, the electrophysiological correlates of perceiving shortly presented visual stimuli are examined. In particular, we investigated the differences in the prestimulus EEG between subjects who were able to discriminate between four shortly presented stimuli (Perceivers) and subjects who were not (Non-Perceivers). Additionally, we investigated the differences between the subjects perceived and unperceived trials. The results show that Perceivers exhibited lower prestimulus alpha power than Non-Perceivers. Analysis of the prestimulus EEG between perceived and unperceived trials revealed that the perception of a stimulus is related to low phase coupling in the alpha frequency range (8-12 Hz) and high phase coupling in the beta and gamma frequency range (20-45 Hz). Single trial analyses showed that perception performance can be predicted by phase coupling in the alpha, beta and gamma frequency range. The findings indicate that synchronous oscillations in the alpha frequency band inhibit the perception of shortly presented stimuli whereas synchrony in higher frequency ranges (>20 Hz) enhances visual perception. We conclude that alpha, beta and gamma oscillations indicate the attentional state of a subject and thus are able to predict perception performance on a single trial basis. (C) 2007 Elsevier Inc. All rights reserved.