Rentzeperis Ilias, Kiper Daniel C
Institute of Neuroinformatics, University of Zurich and Swiss Federal Institute of Technology, Zurich, Switzerland.
J Vis. 2010 Oct 1;10(12):6. doi: 10.1167/10.12.6.
Human visual cortex contains mechanisms that pool local orientation information over large areas of visual space to support percepts of global form. Initial studies concluded that some of these mechanisms are cue invariant, in that they yield form percepts irrespective of whether the visual signals contain luminance or chromatic information. Later studies reported that these mechanisms are chromatically selective, albeit with a broad tuning in color space. We used Glass patterns and the phenomenon of adaptation to determine whether Glass pattern perception is mediated by mechanisms that are color and/or luminance selective, or not. Subjects were adapted to either a radial or concentric Glass pattern of a given color or luminance polarity. We measured the effect of adaptation on subsequent detection of Glass patterns with the same or different visual attributes. Our results show that adapting to a concentric or radial pattern significantly elevates threshold for the subsequent detection of patterns of the same form, irrespective of their color or luminance polarity, but that adaptation to luminance leads to higher threshold elevations than adaptation to color. We conclude that Glass pattern perception is mediated by perceptual mechanisms that are color invariant but not totally insensitive to the difference between color and luminance information.
人类视觉皮层包含一些机制，这些机制会在视觉空间的大片区域整合局部方向信息，以支持对全局形状的感知。最初的研究得出结论，其中一些机制是线索不变的，也就是说，无论视觉信号包含亮度信息还是色度信息，它们都会产生形状感知。后来的研究报告称，这些机制具有颜色选择性，尽管在颜色空间中的调谐范围较宽。我们使用格拉斯图案和适应现象来确定格拉斯图案感知是否由颜色和/或亮度选择性机制介导。让受试者适应给定颜色或亮度极性的径向或同心格拉斯图案。我们测量了适应对后续检测具有相同或不同视觉属性的格拉斯图案的影响。我们的结果表明，适应同心或径向图案会显著提高后续检测相同形状图案的阈值，无论其颜色或亮度极性如何，但亮度适应导致的阈值升高比颜色适应更高。我们得出结论，格拉斯图案感知是由颜色不变但并非完全对颜色和亮度信息差异不敏感的感知机制介导的。
