Dependence of EEG response to flicker stimuli on stimulus parameters
Dependence of EEG response to flicker stimuli on stimulus parameters
复制标题
脑电图对闪烁刺激的反应对刺激参数的依赖性
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Shogo Tanaka
中科院分区：
文献类型：
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作者：
S. Nishifuji;T. Shigeyama;Shogo Tanaka
阐明脑电图的时空动态对于将脑电图应用于临床和福利工程领域（例如，用于身体残疾的脑机接口（BCI））至关重要。本研究以闪烁刺激同步的脑电图（稳态视觉诱发电位，SSVEP）为研究对象，探讨了稳态视觉诱发电位的时空特征对刺激条件的依赖性。在刺激强度为5≤Is≤300 (lx)，刺激频率为7≤ƒs≤16 （Hz）的情况下，对16名受试者进行SSVEP测量。在大多数刺激条件下，从额叶到枕叶的SSVEP空间相位关系表现为驻波特性。然而，在70 < Is < 110 （lx）的条件下，空间相位特性倾向于转向行波型，这表明所激发的SSVEP在空间上是局部的。这一结果表明了产生SSVEP的发电机的参数依赖性。此外，空间相位特征可以用于区分SSVEP和BCI中的各种环境噪声/伪影。
Elucidating the spatiotemporal dynamics of the EEG is crucial for applying the EEG to clinical and welfare engineering fields (e.g., a brain-computer interface (BCI) for physically disabilities). The present study focused on the EEG synchronized with flicker stimuli (steady-state visually evoked potential, SSVEP) and investigated the dependence of spatiotemporal characteristics of the SSVEP on the stimulus conditions. The SSVEP was measured from 16 subjects under the conditions of the stimulus intensity Is and stimulus frequency ƒs in the ranges 5 ≤ Is ≤ 300 (lx) and 7 ≤ ƒs ≤ 16 (Hz), respectively. Spatial phase relationship of the SSVEP from the frontal to occipital lobes showed a property of standing wave under the most of the stimulus conditions. However, the spatial phase property tended to shift to a traveling wave-type under the condition of 70 ≪Is ≪ 110 (lx), indicating that the SSVEP elicited was spatially localized. This result suggests the parametric dependence of generators which are responsible for the SSVEP. Moreover, the spatial phase characteristics can be applied to discriminate between the SSVEP and various environmental noise/artifact in the BCI.
DOI：
10.1073/pnas.0403504101
发表时间：
2004-12-21
影响因子：
11.1
作者：
Wolpaw, JR;McFarland, DJ
通讯作者：
McFarland, DJ