Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University Düsseldorf, Düsseldorf 40225, Germany.
Institute of Clinical Neuroscience and Medical Psychology, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University Düsseldorf, Düsseldorf 40225, Germany
eNeuro. 2024 Sep 12;11(9). doi: 10.1523/ENEURO.0471-23.2024. Print 2024 Sep.
When presented shortly after another, discrete pictures are naturally perceived as continuous. The neuronal mechanism underlying such continuous or discrete perception is not well understood. While continuous alpha oscillations are a candidate for orchestrating such neuronal mechanisms, recent evidence is mixed. In this study, we investigated the influence of prestimulus alpha oscillation on visual temporal perception. Specifically, we were interested in whether prestimulus alpha phase modulates neuronal and perceptual processes underlying discrete or continuous perception. Participants had to report the location of a missing object in a visual temporal integration task, while simultaneously MEG data were recorded. Using source reconstruction, we evaluated local phase effects by contrasting phase angle values between correctly and incorrectly integrated trials. Our results show a phase opposition cluster between -0.8 and -0.5 s (relative to stimulus presentation) and between 6 and 20 Hz. These momentary phase angle values were correlated with behavioral performance and event-related potential amplitude. There was no evidence that frequency defined a window of temporal integration.
当离散的图片在短时间内呈现时，人们会自然地将它们视为连续的。然而，目前对于这种连续或离散感知的神经机制还不是很清楚。尽管连续的 alpha 振荡被认为是协调这种神经机制的候选者，但最近的证据却存在分歧。在这项研究中，我们调查了前刺激 alpha 振荡对视觉时间感知的影响。具体来说，我们感兴趣的是前刺激 alpha 相位是否调节离散或连续感知背后的神经元和感知过程。参与者在进行视觉时间整合任务时，需要报告缺失物体的位置，同时记录 MEG 数据。我们使用源重建来评估局部相位效应，方法是在正确和不正确整合的试验之间对比相位角值。我们的结果显示，在刺激呈现前 0.8 到 0.5 秒之间和 6 到 20 赫兹之间存在一个相位相反的集群。这些瞬间的相位角值与行为表现和事件相关电位的振幅相关。没有证据表明频率定义了时间整合的窗口。
