Wu Zhenghua, Yao Dezhong, Tang Yu, Huang Yilan, Su Sheng
J Biol Phys. 2010 Jun;36(3):261-71. doi: 10.1007/s10867-009-9181-9. Epub 2009 Dec 4.
Previous studies have shown that the amplitude and phase of the steady-state visual-evoked potential (SSVEP) can be influenced by a cognitive task, yet the mechanism of this influence has not been understood. As the event-related potential (ERP) is the direct neural electric response to a cognitive task, studying the relationship between the SSVEP and ERP would be meaningful in understanding this underlying mechanism. In this work, the traditional average method was applied to extract the ERP directly, following the stimulus of a working memory task, while a technique named steady-state probe topography was utilized to estimate the SSVEP under the simultaneous stimulus of an 8.3-Hz flicker and a working memory task; a comparison between the ERP and SSVEP was completed. The results show that the ERP can modulate the SSVEP amplitude, and for regions where both SSVEP and ERP are strong, the modulation depth is large.
先前的研究表明，稳态视觉诱发电位（SSVEP）的幅度和相位会受到认知任务的影响，但其影响机制尚不清楚。由于事件相关电位（ERP）是对认知任务的直接神经电反应，研究SSVEP与ERP之间的关系对于理解这一潜在机制具有重要意义。在本研究中，采用传统的平均方法在工作记忆任务刺激后直接提取ERP，同时利用一种名为稳态探针地形图的技术在8.3Hz闪烁和工作记忆任务的同时刺激下估计SSVEP；完成了ERP与SSVEP之间的比较。结果表明，ERP可以调节SSVEP幅度，并且在SSVEP和ERP都较强的区域，调节深度较大。
