We used fMRI to dissociate decisional and perceptual functions in color categorization. Participants viewed sequences of colored squares which varied in perceptual distance (0, 1 or 2 hue steps) and color (green, blue) and then judged whether one or two colors were present. Occipital, caudate, and anterior insula regions were active when more than one hue was presented, indicating a role in perceptual processing and attentional monitoring. Dorsolateral prefrontal cortex showed greater activity when two colors were present than a single color, indicating a role in coding color category. Cognitive control regions of the intraparietal sulcus and presupplementary motor area were sensitive to the interaction of decision and distance in perceptual space, indicating a role in combining these functions during decision making. These results support theories that colors are represented categorically at high levels of the cognitive hierarchy, and that visual cortex is sensitive to hue rather than color category.

中文翻译：

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颜色分类中的感知和分类处理和表示。

我们使用功能磁共振成像来分离颜色分类中的决策和感知功能。参与者查看了彩色方块的序列，这些方块在感知距离（0、1或2个色阶）和颜色（绿色，蓝色）上有所不同，然后判断是否存在一种或两种颜色。当出现一种以上的色调时，枕骨，尾状和前岛区域活跃，这表明在感知加工和注意监测中发挥作用。当存在两种颜色时，背外侧前额叶皮层显示出比单一颜色更大的活性，表明在编码颜色类别中起作用。顶内沟和辅助运动区的认知控制区域对知觉空间中决策和距离的相互作用敏感，表明在决策过程中将这些功能结合起来的作用。