Decoding of EEG signals reveals non-uniformities in the neural geometry of colour.
Decoding of EEG signals reveals non-uniformities in the neural geometry of colour.
复制标题
脑电图信号的解码揭示了颜色神经几何的不均匀性。
DOI：
10.1016/j.neuroimage.2023.119884
复制
发表时间：
2023
期刊：
影响因子：
5.7
通讯作者：
Chauhan T
中科院分区：
文献类型：
--
作者：
Chauhan T
色觉理论认为，色觉是通过两种颜色机制的比较而产生的，即红色与绿色的比较和黄色与蓝色的比较。四个独特的色调，红色，绿色，蓝色和黄色，被假定出现在这两个色系统的零点。在这里，我们假设，如果独特的色调代表一个听话的皮层状态，他们应该引起更强大的活动相比，其他非独特的色调。我们使用的时空解码方法报告，脑电图（EEG）的反应进行了强大的信息测试等亮度独特的色调在100-350毫秒的窗口从刺激发作。解码在被动和主动观看任务中都是可能的，但是当同时向颜色信号添加高亮度对比度时，解码受到损害。对于大的色调差异，色调解码的效率可以通过在名义上均匀的感知颜色空间中的相互距离来预测。然而，对于独特色调周围的小感知邻域，编码空间显示出关键的非均匀性，这表明神经测量色调空间中的各向异性可能反映感知独特色调。
The idea of colour opponency maintains that colour vision arises through the comparison of two chromatic mechanisms, red versus green and yellow versus blue. The four unique hues, red, green, blue, and yellow, are assumed to appear at the null points of these the two chromatic systems. Here we hypothesise that, if unique hues represent a tractable cortical state, they should elicit more robust activity compared to other, non-unique hues. We use a spatiotemporal decoding approach to report that electroencephalographic (EEG) responses carry robust information about the tested isoluminant unique hues within a 100–350 ms window from stimulus onset. Decoding is possible in both passive and active viewing tasks, but is compromised when concurrent high luminance contrast is added to the colour signals. For large hue-differences, the efficiency of hue decoding can be predicted by mutual distance in a nominally uniform perceptual colour space. However, for small perceptual neighbourhoods around unique hues, the encoding space shows pivotal non-uniformities which suggest that anisotropies in neurometric hue-spaces may reflect perceptual unique hues.