Pupil Constriction in the Glare Illusion Modulates the Steady-State Visual Evoked Potentials
Pupil Constriction in the Glare Illusion Modulates the Steady-State Visual Evoked Potentials
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DOI：
10.1016/j.neuroscience.2019.08.003
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发表时间：
2019-09-15
期刊：
影响因子：
3.3
通讯作者：
Nakauchi, Shigeki
中科院分区：
文献类型：
--
作者：
Suzuki, Yuta;Minami, Tetsuto;Nakauchi, Shigeki
眩光错觉增强了由亮度梯度围绕的中心白色区域的感知亮度，而没有光强度的任何实际变化。本研究采用不同亮度对比度的眩光错觉模式，测量不同亮度对比度下的脑电（EEG）和瞳孔大小的神经生理反应，探讨眩光错觉过程中的亮度错觉是否在早期视皮层发生变化。我们假设，如果这种虚幻的亮度增强是在视觉处理的早期阶段产生的，那么神经反应将与它处理实际光强变化的方式相似。为了测试这一点，我们观察了持续的视觉皮层反应的稳态视觉诱发电位（SSVEP），而参与者观看闪烁的点显示在中央白色区域的眩光错觉和控制刺激（无眩光条件）的亮度对比度。我们发现眩光错觉时的SSVEP幅值低于对照组，尤其是在高亮度对比度条件下。此外，我们发现了抑制SSVEP振幅的眩光错觉的高亮度对比度的基础上更大的瞳孔收缩，从而减少进入瞳孔的光量的可能机制。因此，眩光错觉中的亮度增强已经表现在与较大瞳孔收缩相关的视觉处理的初级阶段。(C)2019作者（S）由Elsevier Ltd代表IBRO出版。
The glare illusion enhances the perceived brightness of a central white area surrounded by a luminance gradient, without any actual change in light intensity. In this study, we measured the varied brightness and neurophysiological responses of electroencephalography (EEG) and pupil size with the several luminance contrast patterns of the glare illusion to address the question of whether the illusory brightness changes to the glare illusion process in the early visual cortex. We hypothesized that if the illusory brightness enhancement was created in the early stages of visual processing, the neural response would be similar to how it processes an actual change in light intensity. To test this, we observed the sustained visual cortical response of steady-state visual evoked potentials (SSVEPs), while participants watched flickering dots displayed in the central white area of both the varied luminance contrast of glare illusion and a control stimulus (no glare condition). We found the SSVEP amplitude was lower in the glare illusion than in the control condition, especially under high luminance contrast conditions. Furthermore, we found the probable mechanisms of the inhibited SSVEP amplitude to the high luminance contrast of glare illusion based on the greater pupil constriction, thereby decreasing the amount of light entering the pupil. Thus, the brightness enhancement in the glare illusion is already represented at the primary stage of visual processing linked to the larger pupil constriction. (C) 2019 The Author(s). Published by Elsevier Ltd on behalf of IBRO.