Effects of luminance contrast, averaged luminance and spatial frequency on vection
Effects of luminance contrast, averaged luminance and spatial frequency on vection
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DOI：
10.1007/s00221-021-06214-5
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发表时间：
2021-09-16
影响因子：
2
通讯作者：
Palmisano, Stephen
中科院分区：
文献类型：
--
作者：
Guo, Xuanru;Nakamura, Shinji;Palmisano, Stephen
改变光流的速度、大小和材料特性可以显著地改变矢量体验（即视觉诱导的自运动幻觉）。到目前为止，还没有系统地研究亮度对比、平均亮度和刺激空间频率对矢量的影响。本研究考察了水平取向光栅以20度或60度/秒的速度连续向下漂移所引起的对流。测试的每个视觉运动刺激都有以下一种：(a)六个不同的亮度对比度水平；(b)四个不同水平的平均亮度；(c)四个不同的空间频率。我们的实验表明，通过操纵这些视觉特性，可以显著改变向量。矢量强度随光栅亮度对比度（实验1）、平均亮度（实验2）和空间频率（实验3）的增加而增加。重要的是，在实验4中，这三个因素之间的相互作用也被发现。虽然模拟表明这些矢量结果可能是由刺激运动能量的影响引起的，但感知光栅可见度、亮度或速度的差异也可能有助于我们的发现。
Changing the speed, size and material properties of optic flow can significantly alter the experience of vection (i.e. visually induced illusions of self-motion). Until now, there has not been a systematic investigation of the effects of luminance contrast, averaged luminance and stimulus spatial frequency on vection. This study examined the vection induced by horizontally oriented gratings that continuously drifted downwards at either 20 degrees or 60 degrees/s. Each of the visual motion stimuli tested had one of: (a) six different levels of luminance contrast; (b) four different levels of averaged luminance; and (c) four different spatial frequencies. Our experiments showed that vection could be significantly altered by manipulating each of these visual properties. Vection strength increased with the grating's luminance contrast (in Experiment 1), its averaged luminance (in Experiment 2), and its spatial frequency (in Experiment 3). Importantly, interactions between these three factors were also found for the vection induced in Experiment 4. While simulations showed that these vection results could have been caused by effects on stimulus motion energy, differences in perceived grating visibility, brightness or speed may have also contributed to our findings.