Attention Periodically Binds Visual Features As Single Events Depending on Neural Oscillations Phase-Locked to Action
Attention Periodically Binds Visual Features As Single Events Depending on Neural Oscillations Phase-Locked to Action
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DOI：
10.1523/jneurosci.2494-18.2019
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发表时间：
2019-05-22
影响因子：
5.3
通讯作者：
Motoyoshi, Isamu
中科院分区：
文献类型：
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作者：
Nakayama, Ryohei;Motoyoshi, Isamu
最近的心理物理学研究表明，4-8Hz范围内的周期性注意有助于视觉检测的表现。本研究考察了人类观察者的特征绑定的周期性，这是注意力的另一个主要功能（3名女性和5名男性观察行为，另外7名男性观察脑电图实验）。在一项心理物理任务中，观察者报告了从快速连续呈现的两个组合亮度-方向对中同步呈现的一对亮度（亮/暗）和方向（顺时针/逆时针）模式。我们发现，在亮度取向对空间分离的条件下，时间绑定表现出类似于8 Hz的周期性振荡，作为自启动按钮按下刺激开始延迟的函数。然而，正如人们从先前关于注意前结合的研究中所期望的那样，在亮度方向对空间重叠的条件下，显著的振荡并不明显。脑电图结果虽然与行为振荡完全一致，但也揭示了不同试验之间的结合表现对相应频带内刺激前神经振荡相的显著依赖。在顶叶传感器中，这种依赖的峰值频率与按钮按下时间前后的试验间相位相干（ITPC）相关。此外，发现ITPC的峰值频率可以预测个体观察者的行为频率。综上所述，这些结果表明，注意在多模态视觉信息的知觉绑定上周期性地运行（频率类似于8 Hz），并由锁相于自愿行为的神经振荡介导。
Recent psychophysical studies have demonstrated that periodic attention in the 4-8Hz range facilitates performance on visual detection. The present study examined the periodicity of feature binding, another major function of attention, in human observers (3 females and 5 males for behavior, with 7 males added for the EEG experiment). In a psychophysical task, observers reported a synchronous pair of brightness (light/dark) and orientation (clockwise/counterclockwise) patterns from two combined brightness-orientation pairs presented in rapid succession. We found that temporal binding performance exhibits periodic oscillations at similar to 8 Hz as a function of stimulus onset delay from a self-initiated button press in conditions where brightness-orientation pairs were spatially separated. However, as one would expect from previous studies on pre-attentive binding, significant oscillations were not apparent in conditions where brightness-orientation pairs were spatially superimposed. EEG results, while fully compatible with behavioral oscillations, also revealed a significant dependence of binding performance across trials on prestimulus neural oscillatory phases within the corresponding band. The peak frequency of this dependence was found to be correlated with intertrial phase coherence (ITPC) around the timing of button press in parietal sensors. Moreover, the peak frequency of the ITPC was found to predict behavioral frequency in individual observers. Together, these results suggest that attention operates periodically (at similar to 8 Hz) on the perceptual binding of multimodal visual information and is mediated by neural oscillations phase-locked to voluntary action.