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首页> 外文期刊>Journal of Neurophysiology >Saccadic suppression measured by steady-state visual evoked potentials
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Saccadic suppression measured by steady-state visual evoked potentials

机译：通过稳态视觉诱发电位测量的扫视抑制

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Visual sensitivity is severely impaired during the execution of saccadic eye movements. This phenomenon has been extensively characterized in human psychophysics and nonhuman primate single-neuron studies, but a physiological characterization in humans is less established. Here, we used a method based on steady-state visually evoked potential (SSVEP), an oscillatory brain response to periodic visual stimulation, to examine how saccades affect visual sensitivity. Observers made horizontal saccades back and forth. while horizontal black-and-white gratings flickered at 5-30 Hz in the background. We analyzed EEG epochs with a length of 0.3 s either centered at saccade onset (saccade epochs) or centered at fixations half a second before the saccade (fixation epochs). Compared with fixation epochs. saccade epochs showed a broadband power increase, which most likely resulted from saccade-related EEG activity. The execution of saccades, however, led to an average reduction of 57% in the SSVEP amplitude at the stimulation frequency. This result provides additional evidence for an active saccadic suppression in the early visual cortex in humans. Compared with previous functional MRI and EEG studies, an advantage of this approach lies in its capability to trace the temporal dynamics of neural activity throughout the time course of a saccade. In contrast to previous electrophysiological studies in nonhuman primates, we did not find any evidence for postsaccadic enhancement, even though simulation results show that our method would have been able to detect it. We conclude that SSVEP is a useful technique to investigate the neural correlates of visual perception during saccadic eye movements in humans.
机译：在执行扫视眼球运动期间，视觉敏感性受到严重受损。这种现象已经广泛表征了人类心理学生和非人类灵长类动物单神经元研究，但人类的生理特征较少。在这里，我们使用了一种基于稳态视觉诱发电位（SSVEP）的方法，振荡脑响应定期视觉刺激，以检查扫描型如何影响视觉敏感性。观察者来回制作水平扫描。虽然水平的黑白光栅在背景中以5-30赫兹闪烁。我们分析了长度为0.3秒的EEG时期，无论是以扫视发作（Saccade时期）为中心，还是以扫视（固定epochs）在半秒半秒的固定。与固定时期相比。 Saccade时期显示宽带电量增加，最有可能引起与扫视相关的脑电图活动。然而，在刺激频率下，SSVEP幅度的平均降低的平均降低了57％。该结果为人类早期的视觉皮层中的积极扫视抑制提供了额外的证据。与先前的功能MRI和EEG研究相比，这种方法的优点在于其在扫视的时间过程中追踪神经活动的时间动态。与以前的非人类灵长类动物的电生理学研究相比，即使仿真结果表明我们的方法能够检测到它，我们没有找到任何证据。我们得出结论，SSVEP是调查人类扫视眼球运动期间视觉感知的神经相关性的一种有用技术。

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