Gheorghiu Elena, Kingdom Frederick A A
McGill Vision Research, Department of Ophthalmology, McGill University, 687 Pine Avenue W., Montreal H3A 1A1, Que., Canada.
Vision Res. 2007 Jun;47(14):1935-49. doi: 10.1016/j.visres.2007.03.010. Epub 2007 May 11.
We investigated whether contour-shape processing mechanisms are selective for color direction using the shape-frequency and shape-amplitude after-effects, or SFAE and SAAE [Gheorghiu, E. & Kingdom, F. A. A. (2006). Luminance-contrast properties of contour-shape processing revealed through the shape-frequency after-effect. Vision Research, 46(21), 3603-3615. Gheorghiu, E. & Kingdom, F. A. A. (2007). The spatial feature underlying the shape-frequency and shape-amplitude after-effects. Vision Research, 47(6), 834-844]. All contours were defined along the 'red-green', 'blue-yellow' and 'luminance' axes of cardinal color space. Adapting and test contours were defined along the same or along opposite polarities within a cardinal axis, and along the same or along different cardinal axes. We found (i) little transfer of the after-effects across different within-axis polarities, for all cardinal axes and for both even-symmetric and odd-symmetric contours; (ii) little transfer between the red-green and blue-yellow cardinal axes; (iii) little transfer between the chromatic and luminance cardinal directions for the SAAE; (iv) large transfer between the chromatic and luminance cardinal directions for the SFAE. We conclude that contour-shape mechanisms are selective for within-cardinal axis polarity and for the chromatic axes within the isoluminant plane. However for certain types of contour-shape processing they are poorly selective along the chromatic versus luminance dimension. Overall our results suggest that contour-shape encoding mechanisms are selective for color direction and that color is important for contour-shape processing.
我们使用形状频率和形状幅度后效（即SFAE和SAAE）[Gheorghiu, E. & Kingdom, F. A. A. (2006). 通过形状频率后效揭示的轮廓形状处理的亮度对比特性。《视觉研究》，46(21), 3603 - 3615。Gheorghiu, E. & Kingdom, F. A. A. (2007). 形状频率和形状幅度后效背后的空间特征。《视觉研究》，47(6), 834 - 844]，研究了轮廓形状处理机制是否对颜色方向具有选择性。所有轮廓均沿着基本颜色空间的“红 - 绿”、“蓝 - 黄”和“亮度”轴定义。适应轮廓和测试轮廓在基本轴内沿着相同或相反的极性定义，并且沿着相同或不同的基本轴定义。我们发现：(i) 对于所有基本轴以及偶对称和奇对称轮廓，后效在不同轴内极性之间的转移很少；(ii) 红 - 绿和蓝 - 黄基本轴之间的转移很少；(iii) 对于SAAE，色度和亮度基本方向之间的转移很少；(iv) 对于SFAE，色度和亮度基本方向之间的转移很大。我们得出结论，轮廓形状机制对基本轴内极性以及等亮度平面内的色度轴具有选择性。然而，对于某些类型的轮廓形状处理，它们在色度与亮度维度上的选择性较差。总体而言，我们的结果表明轮廓形状编码机制对颜色方向具有选择性，并且颜色对于轮廓形状处理很重要。
