Mechanisms for non-luminance contours: analyses of temporal characteristics

视觉轮廓通常由亮度差异来定义，但也可以由双目视差、运动、纹理等的梯度来定义。这个项目试图检查由属性而不是亮度定义的这种轮廓的表示的生成过程。这个项目特别注重它们的时代性。在实际实验中，我们使用SAT(速度-精度权衡)任务考察了轮廓感知的时间特征，并将结果与皮层诱发电位的结果进行了比较。详细的实验结果表明，与一阶(亮度)轮廓的响应相比，所谓的二阶轮廓(定义为视差、运动或纹理)的时间响应一般较慢，但它们之间的响应梯度没有差别。此外，在这些结果和诱发电位反应之间观察到了良好的一致性。

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.