Role of memory process for encoding and decoding of chromatic information in the categorization of color perception

我们已经感知到了之前记忆中的物体颜色和当你看着完全相同的物体时感知到的颜色之间的一些差异。我们这项研究的目的是了解这种颜色感知的内部转移。由于颜色知觉的这种内部移位被认为是由于知觉中颜色的范畴化所致，我们利用心理物理学中的颜色记忆过程和脑成像分析方法研究了范畴化的内部编码过程，发现正常的色觉只形成颜色范畴，它们的边界并不模糊，但色觉缺陷者对边界模糊的颜色进行分类，在不同刺激条件下，两个受试者的大脑皮层均无明显的颜色分类活动，这表明色觉本身的内部操作可能发生在编码过程之前。然而，测量其皮层活动是相当困难的。

We have perceived some difference between an object color that previously rememberedand a color perceived when you are looking at the exact same object. Our aim of this studyis to understand this internal shift of the color perception. Because it has been consideredthat such internal shift of the color perception is due to the categorization of color in theperception, we investigated the internal coding processes for the categorization through theprocesses of color memorization in the psychophysics and by a method of brain imaginganalysis.We found that normal color visions formed color categories exclusively and their borderswere not ambiguous, but that color deficiencies categorized colors with ambiguous borders.There was no significant cortical activity specified the color categorization under different stimulus conditions for both subjects.These indicate that the internal operations of the color sensations per se may occur beforethe coding process. It is however quite difficult to measure its cortical activity.