Selective attention to stimulus location modulates the steady-state visual evoked potential
Selective attention to stimulus location modulates the steady-state visual evoked potential
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DOI：
10.1073/pnas.93.10.4770
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发表时间：
1996-05-14
影响因子：
11.1
通讯作者：
Hillyard, SA
中科院分区：
文献类型：
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作者：
Morgan, ST;Hansen, JC;Hillyard, SA
稳态视觉诱发电位（SS-VEPs）记录了人类受试者的头皮，这些受试者被提示注意呈现在一个视觉半视野中的快速字母数字字符序列，而忽略另一个视觉半视野中的并发字符序列。这些两个字符序列分别叠加在一个小正方形背景上，该背景在一半场中以8.6 Hz的速率闪烁，在另一半场中以12 Hz的速率闪烁。当注意力集中在同一位置的字符序列上时，两种与任务无关的闪烁背景所引发的频率编码SSVEP的振幅显著增大。无论刺激的视野如何，这种振幅增强在右脑枕颞头皮区域最为突出。这些结果表明，SSVEP反映了对所有空间注意“焦点”刺激的神经反应增强，无论这些刺激是否与任务相关，SSVEP的记录为研究多元素视觉显示选择性注意的神经机制和功能特性提供了新的途径。
Steady-state visual evoked potentials (SS-VEPs) were recorded from the scalp of human subjects who were cued to attend to a rapid sequence of alphanumeric characters presented to one visual half-field while ignoring a concurrent sequence of characters in the opposite half-field. These two-character sequences were each superimposed upon a small square background that was flickered at a rate of 8.6 Hz in one half-field and 12 Hz in the other half field. The amplitude of the frequency-coded SSVEP elicited by either of the task-irrelevant flickering backgrounds was significantly enlarged when attention was focused upon the character sequence at the same location. This amplitude enhancement with attention was most prominent over occipital-temporal scalp areas of the right cerebral hemisphere regardless of the visual field of stimulation. These findings indicate that the SSVEP reflects an enhancement of neural responses to all stimuli that fall within the ''spotlight'' of spatial attention, whether or not the stimuli are task-relevant, Recordings of the SSVEP provide a new approach for studying the neural mechanisms and functional properties of selective attention to multi-element visual displays.