Decoding of EEG signals reveals non-uniformities in the neural geometry of colour

Tushar Chauhan*, Ivana Jakovljev, Lindsay Thompson, Sophie Wuerger, Jasna Martinovic*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

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.
Original languageEnglish
Article number119884
Early online date16 Jan 2023
Publication statusPublished - Mar 2023

Keywords / Materials (for Non-textual outputs)

  • unique hues
  • electroencephalography
  • decoding
  • population encoding
  • colour perception


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