空间选择性注意对20 - 28赫兹范围内稳态视觉诱发电位的影响。
Effects of spatial selective attention on the steady-state visual evoked potential in the 20-28 Hz range.
作者信息
Müller M M, Picton T W, Valdes-Sosa P, Riera J, Teder-Sälejärvi W A, Hillyard S A
机构信息
Department of Psychology, University of Konstanz, D-78434 Konstanz, Germany.
出版信息
Brain Res Cogn Brain Res. 1998 Apr;6(4):249-61. doi: 10.1016/s0926-6410(97)00036-0.
Steady-state visual evoked potentials (SSVEPs) were recorded from the scalp of subjects who attended to a flickering LED display in one visual field while ignoring a similar display (flickering at a different frequency) in the opposite visual field. The flicker frequencies were 20.8 Hz in the left-field display and 27.8 Hz in the right-field display. The SSVEP to the flicker in either field was enhanced in amplitude when attention was directed to its location. The scalp distribution of this SSVEP enhancement was narrowly focused over the posterior scalp contralateral to the visual field of stimulation. A source analysis using Variable Resolution Electromagnetic Tomography (VARETA) indicated that the source current densities for the SSVEP attention effect had a focal origin in the contralateral parieto-occipital cortex.
从受试者头皮记录稳态视觉诱发电位（SSVEPs），这些受试者在一个视野中注视闪烁的发光二极管（LED）显示屏，同时忽略对侧视野中类似的显示屏（以不同频率闪烁）。左视野显示屏的闪烁频率为20.8赫兹，右视野显示屏的闪烁频率为27.8赫兹。当注意力指向某一视野中的闪烁时，该视野中闪烁所诱发的SSVEP的振幅会增强。这种SSVEP增强的头皮分布在刺激视野对侧的后头皮区域狭窄聚焦。使用可变分辨率电磁断层扫描（VARETA）进行的源分析表明，SSVEP注意力效应的源电流密度起源于对侧顶枕叶皮质的一个焦点。
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