Spatial attention enhances cortical tracking of quasi-rhythmic visual stimuli
Spatial attention enhances cortical tracking of quasi-rhythmic visual stimuli
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DOI：
10.1016/j.neuroimage.2019.116444
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发表时间：
2019-07
期刊：
影响因子：
5.7
通讯作者：
Davide Tabarelli;C. Keitel;Joachim Gross;Daniel Baldauf
中科院分区：
文献类型：
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作者：
Davide Tabarelli;C. Keitel;Joachim Gross;Daniel Baldauf
成功地解释和导航我们的自然视觉环境需要我们不断地跟踪它的动态。此外，我们把注意力集中在行为相关的刺激，以提高他们的神经处理。然而，很少有人知道持续的注意力如何影响正在进行的跟踪刺激丰富的自然时间动态。在这里，我们使用MRI知情源重建脑磁图（MEG）数据映射到什么程度的各种皮层区域跟踪并发连续准节奏的视觉刺激。此外，我们测试了自上而下的视觉空间注意力如何影响这种跟踪过程。我们的双侧呈现的准节奏刺激覆盖了4-20 Hz的动态范围，细分为三个不同的频带。作为实验对照，我们还包括严格的节律刺激（10与12 Hz）。使用脑刺激耦合的频谱测量，我们能够独立地跟踪左刺激与右刺激的神经处理，即使在相同的频率范围内波动。神经跟踪的保真度取决于刺激频率，随着频率的增加而降低。出席和非出席的刺激被跟踪超出早期的视觉皮层，在腹侧和背侧流取决于刺激频率。在一般情况下，跟踪改善视觉空间注意力的刺激位置的部署。我们的研究结果为人类视觉皮层如何处理并发动态刺激提供了新的见解，并提供了一种潜在的机制-即提高跟踪的时间精度-以提高参与输入的神经表示。
Successfully interpreting and navigating our natural visual environment requires us to track its dynamics constantly. Additionally, we focus our attention on behaviorally relevant stimuli to enhance their neural processing. Little is known, however, about how sustained attention affects the ongoing tracking of stimuli with rich natural temporal dynamics. Here, we used MRI-informed source reconstructions of magnetoencephalography (MEG) data to map to what extent various cortical areas track concurrent continuous quasi-rhythmic visual stimulation. Further, we tested how top-down visuo-spatial attention influences this tracking process. Our bilaterally presented quasi-rhythmic stimuli covered a dynamic range of 4–20 Hz, subdivided into three distinct bands. As an experimental control, we also included strictly rhythmic stimulation (10 vs 12 Hz). Using a spectral measure of brain-stimulus coupling, we were able to track the neural processing of left vs. right stimuli independently, even while fluctuating within the same frequency range. The fidelity of neural tracking depended on the stimulation frequencies, decreasing for higher frequency bands. Both attended and non-attended stimuli were tracked beyond early visual cortices, in ventral and dorsal streams depending on the stimulus frequency. In general, tracking improved with the deployment of visuo-spatial attention to the stimulus location. Our results provide new insights into how human visual cortices process concurrent dynamic stimuli and provide a potential mechanism – namely increasing the temporal precision of tracking – for boosting the neural representation of attended input.