On the synchrony of steady state visual evoked potentials and oscillatory burst events
On the synchrony of steady state visual evoked potentials and oscillatory burst events
复制标题
DOI：
10.1007/s11571-009-9082-4
复制
发表时间：
2009-03
影响因子：
3.7
通讯作者：
F. Vialatte;J. Dauwels;M. Maurice;Y. Yamaguchi;A. Cichocki
中科院分区：
文献类型：
--
作者：
F. Vialatte;J. Dauwels;M. Maurice;Y. Yamaguchi;A. Cichocki
在本文中，我们调查的大规模同步性的脑电振荡爆发，在刺激闪烁的光广场。鉴于大多数研究集中在平均原始EEG反应，这项研究考虑了单次试验EEG中的振荡事件，这导致了各种新的见解。我们记录了EEG信号之前，期间和之后的中（16 Hz）和高频率（32 Hz）范围内的闪烁的光广场刺激。在稳态视觉诱发电位（SSVEP）的单次同步试验中，可以发现与自发EEG中观察到的振荡爆发相似的振荡爆发。这些爆发是使用碰撞建模从单次试验的EEG中提取的。随机事件同步方法应用于这些事件，它量化的同步振荡爆发的大规模的基础上。这些振荡模式在SSVEP期间具有显著更高程度的共现，与正在进行的信号同步无关。这意味着EEG振荡模式可能是大脑活动的结果，而不仅仅是持续EEG的副作用。它们在视觉刺激期间经历一致的重组，优先沿着视觉通路，这取决于大或小刺激。闪烁刺激可能会引起一些认知副作用，这取决于刺激频率。
In this paper, we investigate the large-scale synchrony of EEG oscillatory bursts, during stimulation by a flickering square of light. Whereas most studies focus onaveragedraw EEG responses, this study considers oscillatory events within EEG ofsingletrials, which leads to various new insights. We recorded EEG signals before, during and after stimulation by a flickering square of light in medium (16 Hz) and high frequency (32 Hz) ranges. Similar oscillatory bursts, to those observed in spontaneous EEG, can be found in single-trial synchrony of steady state visual evoked potentials (SSVEP). These bursts are extracted from the EEG of single trials using bump modeling. Stochastic event synchrony method is applied to those events, which quantifies synchronies of oscillatory bursts on a large-scale basis. Those oscillatory patterns have a significantly higher degree of co-occurrence during SSVEP, uncorrelated with ongoing signal synchrony. It means that EEG oscillatory patterns are presumably an outcome of brain activity, rather than a mere side effect of ongoing EEG. They undergo a consistent reorganization during visual stimulation, preferentially along the visual pathway, depending on magno or parvo stimulations. Flickering stimuli may induce some cognitive side-effects depending on the stimulation frequency.