Visual mechanisms that signal the direction of color changes
Visual mechanisms that signal the direction of color changes
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DOI：
10.1016/0042-6989(93)90239-s
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发表时间：
1993-05
期刊：
影响因子：
1.8
通讯作者：
Q. Zaidi;Daniel Halevy
中科院分区：
文献类型：
--
作者：
Q. Zaidi;Daniel Halevy
有证据表明，视觉能力专门用于感知颜色随时间变化的色彩方向。测量连续间隔中呈现的阈上颜色变化对之间的辨别阈值。在一个间隔内，空间均匀圆盘的颜色沿着等亮度颜色平面中的圆周以恒定速度变化。另一方面，可以将瞬时变化描述为等亮度平面中的矢量，将其添加到圆形颜色调制中。对条件进行平均表明，区分一对纯粹时间颜色变化的阈值大约与它们之间的颜色角度的余弦成正比。为解释这些结果而提出的模型基于并行方向颜色机制，该机制针对颜色空间中的不同方向进行调整，并且响应一种颜色方向的变化，但不响应其相反方向的变化。
Evidence is presented for a visual capacity specialized to sense the chromatic direction of change in colors over time. Discrimination thresholds were measured between pairs of suprathreshold color changes presented in consecutive intervals. In one interval, the color of a spatially uniform disk was changed at a constant speed along the circumference of a circle in an equiluminant color plane. In the other, an instantaneous change, which can be described as a vector in the equiluminant plane, was added to the circular color modulation. Averaging across conditions showed that the threshold for discriminating between a pair of purely temporal color changes was approximately proportional to the cosine of the color angle between them. The model that is presented to account for these results is based on parallel directional-color mechanisms that are tuned to different directions in color-space and are responsive to change in one color direction but not its opposite.