Decoding of EEG signals reveals non-uniformities in the neural geometry of colour
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 hypot...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | NeuroImage |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1053811923000332 |
| _version_ | 1828039606014050304 |
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| author | Tushar Chauhan Ivana Jakovljev Lindsay N. Thompson Sophie M. Wuerger Jasna Martinovic |
| author_facet | Tushar Chauhan Ivana Jakovljev Lindsay N. Thompson Sophie M. Wuerger Jasna Martinovic |
| author_sort | Tushar Chauhan |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-10T16:43:34Z |
| format | Article |
| id | doaj.art-b6e1af6b542248429df769103380f86f |
| institution | Directory Open Access Journal |
| issn | 1095-9572 |
| language | English |
| last_indexed | 2024-04-10T16:43:34Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | NeuroImage |
| spelling | doaj.art-b6e1af6b542248429df769103380f86f2023-02-08T04:16:30ZengElsevierNeuroImage1095-95722023-03-01268119884Decoding of EEG signals reveals non-uniformities in the neural geometry of colourTushar Chauhan0Ivana Jakovljev1Lindsay N. Thompson2Sophie M. Wuerger3Jasna Martinovic4The Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 02139 Cambridge MA, USA; Corresponding authors.Department of Psychology. Faculty of Philosophy, University of Novi Sad, SerbiaSchool of Psychology, University of Aberdeen, Aberdeen, AB24 3FX, UKDepartment of Psychology, University of Liverpool, Liverpool, L697ZA, UKSchool of Psychology, University of Aberdeen, Aberdeen, AB24 3FX, UK; Department of Psychology, School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, EH8 9JZ, UK; Corresponding authors.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.http://www.sciencedirect.com/science/article/pii/S1053811923000332Unique huesElectroencephalographyDecodingPopulation encodingColour perception |
| spellingShingle | Tushar Chauhan Ivana Jakovljev Lindsay N. Thompson Sophie M. Wuerger Jasna Martinovic Decoding of EEG signals reveals non-uniformities in the neural geometry of colour NeuroImage Unique hues Electroencephalography Decoding Population encoding Colour perception |
| title | Decoding of EEG signals reveals non-uniformities in the neural geometry of colour |
| title_full | Decoding of EEG signals reveals non-uniformities in the neural geometry of colour |
| title_fullStr | Decoding of EEG signals reveals non-uniformities in the neural geometry of colour |
| title_full_unstemmed | Decoding of EEG signals reveals non-uniformities in the neural geometry of colour |
| title_short | Decoding of EEG signals reveals non-uniformities in the neural geometry of colour |
| title_sort | decoding of eeg signals reveals non uniformities in the neural geometry of colour |
| topic | Unique hues Electroencephalography Decoding Population encoding Colour perception |
| url | http://www.sciencedirect.com/science/article/pii/S1053811923000332 |
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