Patterson R, Becker S
Department of Psychology, Washington State University, Pullman 99164-4820, USA.
Vision Res. 1996 Jun;36(12):1773-81. doi: 10.1016/0042-6989(95)00239-1.
Across four experiments, this study investigated direction-specific adaptation and simultaneous contrast induced by moving binocular disparity information (stereoscopic motion). The stimuli were moving arrays of stereoscopic dots created from dynamic random-element stereograms. Experiments 1 and 2 examined the effects of adaptation to motion in a given direction on the apparent direction of test motion. Results showed that the direction of test motion appeared repulsed away from the direction of adapting motion (repulsion aftereffect) by as much as 20 deg or more when directions of adapt and test were similar. Experiment 3 investigated transfer of the repulsion aftereffect across the stereoscopic and luminance domains by employing stereoscopic adapting motion and luminance test motion or vice versa. Results showed that the repulsion aftereffect transferred across the two stimulus domains. Experiment 4 investigated direction-specific contrast by measuring the perceived direction of two stereoscopic arrays presented simultaneously and moving in different directions. Results showed that the directions of the arrays appeared repulsed away from one another when their directions were similar. Taken together, these results suggest that the direction of stereoscopic motion is coded in the activity of directionally selective mechanisms, as is the case for luminance-domain motion. Transfer of the repulsion aftereffect between stereoscopic and luminance domains indicates the two kinds of motion perception are mediated by a common substrate.
在四项实验中，本研究调查了由双目视差信息（立体视觉运动）所引发的特定方向适应性和同时对比。刺激物是由动态随机元素立体图生成的立体点移动阵列。实验1和实验2研究了在给定方向上对运动的适应对测试运动视在方向的影响。结果表明，当适应方向和测试方向相似时，测试运动的方向会出现从适应运动方向被排斥开的情况（排斥后效），排斥角度可达20度或更大。实验3通过采用立体视觉适应运动和亮度测试运动，或者反之，来研究排斥后效在立体视觉和亮度领域之间的转移。结果表明，排斥后效在两个刺激领域之间发生了转移。实验4通过测量同时呈现且沿不同方向移动的两个立体阵列的感知方向，研究了特定方向对比。结果表明，当两个阵列的方向相似时，它们的方向会出现相互排斥的情况。综合来看，这些结果表明，立体视觉运动的方向是由方向选择性机制的活动编码的，亮度领域的运动也是如此。排斥后效在立体视觉和亮度领域之间的转移表明，这两种运动感知是由一个共同的基质介导的。
