Time Courses of Attentional Modulation in Neural Amplification and Synchronization Measured with Steady-state Visual-evoked Potentials
Time Courses of Attentional Modulation in Neural Amplification and Synchronization Measured with Steady-state Visual-evoked Potentials
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DOI：
10.1162/jocn_a_00212
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发表时间：
2012-08-01
影响因子：
3.2
通讯作者：
Shioiri, Satoshi
中科院分区：
文献类型：
--
作者：
Kashiwase, Yoshiyuki;Matsumiya, Kazumichi;Shioiri, Satoshi
内源性注意调节稳态视觉诱发电位（SSVEP）的幅度和相位相干性。在努力破译注意调制的神经机制，我们比较了注意调制的SSVEP振幅（被认为反映了神经群体活动的大小）和相位相干性（被认为反映了神经反应同步）的时间过程。我们提出了两个刺激闪烁在不同的频率在左侧和右侧的视觉半野，并要求观察者将注意力转移到任何刺激。我们的研究结果表明，注意增加SSVEP相位相干早于它增加SSVEP振幅，与SSVEP相位相干和振幅的注意调制之间呈正相关。此外，注意力转移的行为动力学与相位相干性的变化比与振幅的变化更密切相关。这些结果与注意力增加神经反应同步的可能性一致，这反过来又导致神经群体活动增加。
Endogenous attention modulates the amplitude and phase coherence of steady-state visual-evoked potentials (SSVEPs). In efforts to decipher the neural mechanisms of attentional modulation, we compared the time course of attentional modulation of SSVEP amplitude (thought to reflect the magnitude of neural population activity) and phase coherence (thought to reflect neural response synchronization). We presented two stimuli flickering at different frequencies in the left and right visual hemifields and asked observers to shift their attention to either stimulus. Our results demonstrated that attention increased SSVEP phase coherence earlier than it increased SSVEP amplitude, with a positive correlation between the attentional modulations of SSVEP phase coherence and amplitude. Furthermore, the behavioral dynamics of attention shifts were more closely associated with changes in phase coherence than with changes in amplitude. These results are consistent with the possibility that attention increases neural response synchronization, which in turn leads to increased neural population activity.