Orientation-selective contrast adaptation measured with SSVEP
Orientation-selective contrast adaptation measured with SSVEP
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使用 SSVEP 测量方向选择性对比度适应
DOI：
10.1167/18.5.2
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发表时间：
2018
影响因子：
1.8
通讯作者：
Engel, Stephen A.
中科院分区：
文献类型：
--
作者：
Vergeer, Mark;Mesik, Juraj;Baek, Yihwa;Wilmerding, Kelton;Engel, Stephen A.
暴露于定向亮度对比度模式会导致视觉灵敏度降低，特别是适配器方向的视觉灵敏度降低。这种方向选择性可能是对比度适应中研究最多的方面，但很少用稳态视觉诱发电位（SSVEP）进行测量，尽管它们已成为人类神经科学中更流行的方法之一。在这里，我们通过呈现格子刺激来测量方向选择性适应，其中水平和垂直光栅在不同时间频率下反转对比度，同时记录来自枕叶视觉区域的脑电图信号。在三个实验中，我们比较了适应前后对格子图案的 SSVEP 响应。所有实验均表明，在适配器方向的频率下，SSVEP 响应显着降低，而在正交方向的频率下，不存在这种效应。适应还导致鲁棒的相位延迟，选择性地针对与适配器方向相对应的 SSVEP 频率。这些结果证明了 SSVEP 在测量方向选择性适应方面的效率；该方法可以同时测量两个方向的幅度和相位的变化。
Exposure to oriented luminance contrast patterns causes a reduction in visual sensitivity specifically for the adapter orientation. This orientation selectivity is probably the most studied aspect of contrast adaptation, but it has rarely been measured with steady-state visually evoked potentials (SSVEPs), despite their becoming one of the more popular methods of human neuroscience. Here, we measured orientation selective adaptation by presenting a plaid stimulus of which the horizontal and vertical grating reversed contrast at different temporal frequencies, while recording EEG signals from occipital visual areas. In three experiments, we compared SSVEP responses to the plaid before and after adaptation. All experiments showed a significant decrease in SSVEP response at the frequency of the adapter orientation, whereas such an effect was absent for the frequency of the orthogonal orientation. Adaptation also led to robust phase delays, selectively for the SSVEP frequency corresponding to the adapter orientation. These results demonstrate the efficiency of SSVEPs for measuring orientation selective adaptation; the method can measure changes in both amplitude and phase, simultaneously for two orientations.