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首页> 外文期刊>Current Biology: CB >Prestimulus Oscillatory Phase at 7 Hz Gates Cortical Information Flow and Visual Perception
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Prestimulus Oscillatory Phase at 7 Hz Gates Cortical Information Flow and Visual Perception

机译：7 Hz的震颤震荡前期可控制皮层信息流和视觉感知

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Although we have the impression that visual information flows continuously from our sensory channels, recent studies indicate that this is likely not the case. Rather, we sample visual stimuli rhythmically, oscillating at 5-10 Hz [1-3]. Electroencephalography (EEG) studies have demonstrated that this rhythmicity is reflected by the phase of ongoing brain oscillations in the same frequency [4-6]. Theoretically, brain oscillations could underlie the rhythmic nature of perception by providing transient time windows for information exchange [7], but this question has not yet been systematically addressed. We recorded simultaneous EEG-fMRI while human participants performed a contour integration task and show that ongoing brain oscillations prior to stimulus onset predict functional connectivity between higher and lower level visual processing regions. Specifically, our results demonstrate that the phase of a 7 Hz oscillation prior to stimulus onset predicts perceptual performance and the bidirectional information flow between the left lateral occipital cortex and right intraparietal sulcus, as indicated by psychophysiological interaction and dynamic causal modeling. These findings suggest that human brain oscillations periodically gate visual perception at around 7 Hz by providing transient time windows for long-distance cortical information transfer. Such gating might be a general mechanism underlying the rhythmic nature of human perception.
机译：尽管我们的印象是视觉信息不断从我们的感觉通道中流出，但最近的研究表明情况可能并非如此。相反，我们以有节奏的方式采样视觉刺激，以5-10 Hz的频率振荡[1-3]。脑电图（EEG）研究表明，这种节律性是由相同频率的持续性脑震荡阶段反映出来的[4-6]。从理论上讲，大脑振动可以通过为信息交换提供短暂的时间窗口来支撑知觉的节奏性[7]，但是这个问题尚未得到系统地解决。我们记录了同时进行的EEG-fMRI，而人类参与者执行了轮廓整合任务，并显示出在刺激发作之前进行中的大脑振荡可预测较高和较低水平视觉处理区域之间的功能连接。具体而言，我们的研究结果表明，刺激发作之前的7 Hz振荡相位可预测知觉表现以及左枕骨外侧皮质与右顶壁沟之间的双向信息流，如心理生理相互作用和动态因果模型所示。这些发现表明，人脑振荡通过提供用于远程皮层信息传递的瞬态时间窗口，周期性地在7 Hz左右控制视觉感知。这种门控可能是人类感知节奏性的基本机制。

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