Min Seung Hyun, Reynaud Alexandre, Hess Robert F
McGill Vision Research, Department of Ophthalmology and Visual Sciences, McGill University, Montreal, QC H3G 1A4, Canada.
Vision (Basel). 2020 Mar 20;4(1):20. doi: 10.3390/vision4010020.
The Pulfrich effect is a stereo-motion phenomenon. When the two eyes are presented with visual targets moving in fronto-parallel motion at different luminances or contrasts, the perception is of a target moving-in-depth. It is thought that this percept of motion-in-depth occurs because lower luminance or contrast delays the speed of visual processing. Spatial properties of an image such as spatial frequency and size have also been shown to influence the speed of visual processing. In this study, we use a paradigm to measure interocular delay based on the Pulfrich effect where a structure-from-motion defined cylinder, composed of Gabor elements displayed at different interocular phases, rotates in depth. This allows us to measure any relative interocular processing delay while independently manipulating the spatial frequency and size of the micro elements (i.e., Gabor patches). We show that interocular spatial frequency differences, but not interocular size differences of image features, produce interocular processing delays.
普尔弗里希效应是一种立体运动现象。当两只眼睛看到以不同亮度或对比度进行额状面平行运动的视觉目标时，会感觉到目标在深度上移动。据认为，这种深度运动的感知是因为较低的亮度或对比度会延迟视觉处理的速度。图像的空间特性，如空间频率和大小，也已被证明会影响视觉处理的速度。在本研究中，我们使用一种基于普尔弗里希效应的范式来测量双眼延迟，其中一个由在不同双眼相位显示的Gabor元素组成的从运动定义的圆柱体在深度上旋转。这使我们能够测量任何相对的双眼处理延迟，同时独立地操纵微元素（即Gabor斑块）的空间频率和大小。我们表明，图像特征的双眼空间频率差异而非双眼大小差异会产生双眼处理延迟。
