Is a color processed with a right hemispheric dominance?

众所周知，左半球在语言和分析处理中占主导地位，而右半球在情感和整体处理中占主导地位。颜色信号处理的半球差异没有很好的文献记录。我们已经研究了这个问题，使用了一个反应时间任务，在右侧或左侧视野中呈现视觉刺激，并由同侧手做出反应。我们发现了明显的半球不对称，在颜色处理中占主导地位。当我们使用消色差刺激进行测试时，或者当我们在视野中心呈现彩色刺激时，没有得到这种不对称。这些结果强烈表明，颜色处理在两个半球是不同的，以右半球为主。本研究通过研究颜色辨别的不对称性，进一步探讨了半球优势在颜色加工中的作用。因为辨别加工是建立在分析加工基础上的，所以可能导致左半球优势。另一方面，颜色识别可能是由右半球优势处理的，就像我们之前得到的颜色检测一样。我们在两个实验中研究了这个问题，一个是有语言提示的颜色辨别，另一个是没有语言提示的。在两种情况下，辨别任务都导致左半球优势，表明颜色处理具有半球不对称性；右半球处理颜色检测更快，而左半球处理颜色识别更占优势。

It has been known that the left hemisphere is dominant in verbal and analystic processing, while the right hemisphere is dominant in emotional and holistic processing. The hemispheric difference in color signal processing is not well documented. We have been studied this matter using a reaction time task with a visual stimuli presented either in the right or the left visual field, and with a response by the ipsilateral hand. We found that significant hemispheric asymmetry with the right dominance in the color processing. No such asymmetry was obtained when we tested using achromatic stimuli, or when we presented color stimuli at the center of the visual field. These results strongly suggested that color processing was differentially processed in the both hemisphere with the right hemisphere dominance. The present study explored further the hemisphere dominance in color processing by investigating the asymmetry in color discrimination. Because discrimination processing based on analystic processing, it may lead to the left hemispheric dominance. On the other hand, the color discrimination might be processed with the right hemispheric dominance, as in the case of color detection, which we obtained previously. We investigated this matter in two tasks, one with language cues for the color discrimination and the other without language cues. In both case the discrimination task resulted in the left hemispheric dominance, showing that the color processing has hemispheric asymmetry ; the color detection is processed more rapidly in the right hemisphere while the color discrimination is processed with a left hemispheric dominance.