Gamma flicker triggers attentional selection without awareness
Gamma flicker triggers attentional selection without awareness
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DOI：
10.1073/pnas.0810496106
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发表时间：
2009-02-03
影响因子：
11.1
通讯作者：
Usher, Marius
中科院分区：
文献类型：
--
作者：
Bauer, Frank;Cheadle, Samuel W.;Usher, Marius
神经活动中的伽马波段调制被认为介导了注意过程。为了支持伽马活动与注意选择之间的因果联系，我们试图通过50赫兹的阈下闪烁来诱发伽马振荡。我们发现，在目标呈现之前，目标位置的50赫兹阈下闪烁加快并增强了目标检测和辨别能力。这种效应在伽马波段范围内是特定的，因为在<35赫兹的闪烁中不明显。它需要300毫秒来建立，在闪烁停止后的250毫秒内消散，并在500毫秒后显示出反转的趋势。我们结合伽马波段神经同步在视觉注意分配中的作用对这些结果进行了讨论。
Gamma band modulations in neural activity have been proposed to mediate attentional processes. To support a causal link between gamma activity and attentional selection, we attempt to evoke gamma oscillations by a 50-Hz subliminal flicker. We find that a subliminal 50-Hz flicker at a target location, before target presentation, speeds up and enhances target detection and discrimination. This effect is specific to the middle of the gamma range because it is not evident at < 35-Hz flicker. It requires 300 ms to build up, dissipates within 250 ms of flicker offset, and shows a tendency to invert after 500 ms. The results are discussed in relation to a role for gamma band neural synchrony in the allocation of visual attention.