Rajendran Siddhart S, Retter Talia L, Vemuri Kavita, Webster Michael A
J Opt Soc Am A Opt Image Sci Vis. 2025 May 1;42(5):B413-B424. doi: 10.1364/JOSAA.545299.
The color gamut of visual scenes can encompass a multitude of hues, but how many distinct hues are individuals aware of? We examined this question in the context of texture perception, with a grid of stimuli composed of random colors chosen from color sets varying from two to six different hues or saturations. In a behavioral experiment, participants had to discriminate between differences in the number of hues present by identifying which of four color grids included a larger number of different colors. Color number discrimination was also assessed neurally, using electroencephalogram (EEG) frequency tagging, wherein a texture with an extra hue was shown as an "oddball," once per second, in a stream of textures presented at six images per second. In both experiments, two versus three texture contrasts were readily distinguished, yet performance fell rapidly when the set size increased further. The results suggest that sensitivity to the density of the color gamut defining a texture is very restricted.
视觉场景的色域可以包含众多色调，但个体能感知到多少种不同的色调呢？我们在纹理感知的背景下研究了这个问题，使用了由从包含两到六种不同色调或饱和度的颜色集合中随机选择的颜色组成的刺激网格。在一项行为实验中，参与者必须通过识别四个颜色网格中哪个包含更多不同颜色来区分呈现的色调数量差异。还使用脑电图（EEG）频率标记对颜色数量辨别进行了神经学评估，其中每秒有一次，在每秒呈现六幅图像的纹理流中，带有额外色调的纹理作为“异常刺激”显示。在这两个实验中，两种与三种纹理对比度很容易区分，但当集合大小进一步增加时，表现迅速下降。结果表明，对定义纹理的色域密度的敏感度非常有限。
