Mechanisms for non-luminance contours: analyses of temporal characteristics

视觉轮廓通常由亮度差定义，但也可以由视差梯度、运动、纹理等定义，本项目试图研究由亮度以外的属性定义的轮廓表示的生成过程。该项目特别关注其时间特性。在实际的实验中，我们研究了轮廓知觉的时间特性，通过使用SAT（速度-准确性权衡）任务，并与皮层诱发电位的结果进行比较。从详细的实验结果表明，所谓的二阶轮廓（视差，运动，或纹理定义）的时间响应一般是较慢的一阶（亮度）轮廓的响应相比，但它们之间的响应梯度是没有区别的。此外，这些结果和诱发电位反应之间观察到良好的协议。

Visual Contours are generally defined by luminance differences, abut they could be defined by gradients of binocular disparity, motion, texture and so on. This project tries to examine the generation processes for representations of such contours defined by attributes other than luminance. This projects especially focuses on their temporal characteristics. In the actual experiment, we examined the temporal characteristics of contour perception by using a SAT (speed-accuracy trade-off) task and compared the results with those found with cortical evoked potentials. Results from detailed experiments revealed that the temporal responses for so called second-order contours (disparity-, motion-, or texture defined) are slower in general when compared to responses for first-order (luminance) contour, but the response gradient is not different between them. In addition, good agreements were observed between these results and evoked potential responses.