Adaptation and visual discomfort from flicker
Adaptation and visual discomfort from flicker
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DOI：
10.1016/j.visres.2019.04.010
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发表时间：
2019-07
期刊：
影响因子：
1.8
通讯作者：
Sanae Yoshimoto;Fang Jiang;T. Takeuchi;A. Wilkins;M. Webster
中科院分区：
文献类型：
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作者：
Sanae Yoshimoto;Fang Jiang;T. Takeuchi;A. Wilkins;M. Webster
具有不自然幅度谱的空间图像往往看起来不舒服。类似的效果被发现在时间域中，但闪烁模式的不适也强烈依赖于相位谱。在这里，我们研究了如何不适的时间闪烁的影响，适应不同的幅度和相位谱。适应和测试闪烁是通过增加（模糊）或减少（锐化）幅度谱的斜率过滤的均匀场中的方波或随机相变。参与者对测试闪烁的不适或清晰度/模糊程度进行评级。在适应之前，方波转变在具有“聚焦”边缘时被评为最舒适的，其被定义为以1/famplitude谱为特征，而随机相变反而显得越模糊越舒适。适应模糊或锐化过渡后，方波和随机相位闪烁出现更尖锐或模糊，分别，这些效果是一致的感知时间焦点的重整。相比之下，适应影响的不适在两个波形在性质上不同的方式，暴露于适应刺激往往会增加，而不是减少其感知的不适。这些结果表明感知振幅谱和感知不适感之间存在分离，表明它们部分取决于不同的过程。结果进一步说明了相位谱在确定闪烁模式的视觉不适中的重要性。
Spatial images with unnatural amplitude spectra tend to appear uncomfortable. Analogous effects are found in the temporal domain, yet discomfort in flickering patterns is also strongly dependent on the phase spectrum. Here we examined how discomfort in temporal flicker is affected by adaptation to different amplitude and phase spectra. Adapting and test flicker were square wave or random phase transitions in a uniform field filtered by increasing (blurred) or decreasing (sharpened) the slope of the amplitude spectrum. Participants rated the level of discomfort or sharpness/blur for the test flicker. Before adaptation, square wave transitions were rated as most comfortable when they had “focused” edges, which were defined as characterized by 1/famplitude spectra, while random phase transitions instead appeared more comfortable the more blurred they were. After adapting to blurred or sharpened transitions, both square wave and random phase flicker appeared more sharpened or blurred, respectively, and these effects were consistent with renormalization of perceived temporal focus. In comparison, adaptation affected discomfort in the two waveforms in qualitatively different ways, and exposure to the adapting stimulus tended to increase rather than decreased its perceived discomfort. These results point to a dissociation between the perceived amplitude spectrum and perceived discomfort, suggesting they in part depend on distinct processes. The results further illustrate the importance of the phase spectrum in determining visual discomfort from flickering patterns.