Year: 2021
Type: article
Abstract: Recent advances have made it possible to decode various aspects of visually presented stimuli from patterns of scalp EEG measurements. As of recently, such multivariate methods have been commonly used to decode visual-spatial features such as location, orientation, or spatial frequency. In the current study, we show that it is also possible to track visual colour processing by using Linear Discriminant Analysis on patterns of EEG activity. Building on other recent demonstrations, we show that colour decoding: (1) reflects sensory qualities (as opposed to, for example, verbal labelling) with a prominent contribution from posterior electrodes contralateral to the stimulus, (2) conforms to a parametric coding space, (3) is possible in multi-item displays, and (4) is comparable in magnitude to the decoding of visual stimulus orientation. Through subsampling our data, we also provide an estimate of the approximate number of trials and participants required for robust decoding. Finally, we show that while colour decoding can be sensitive to subtle differences in luminance, our colour decoding results are primarily driven by measured colour differences between stimuli. Colour decoding opens a relevant new dimension in which to track visual processing using scalp EEG measurements, while bypassing potential confounds associated with decoding approaches that focus on spatial features.
Source: NeuroImage
Language: English
Subfield: Cognitive Neuroscience
Field: Neuroscience
Domain: Life Sciences
Open Access status: gold
Estimated APC paid: $3,300
Funders: James S. McDonnell Foundation, Wellcome Trust, National Institute for Health and Care Research, European Commission, Directorate for Biological Sciences, Medical Research Council, Biotechnology and Biological Sciences Research Council, Economic and Social Research Council, European Research Council, NIHR Oxford Biomedical Research Centre, H2020 Marie Skłodowska-Curie Actions
Awards: G1126217917, G128649688, Wellcome Centre for Integrative Neuroimaging, G171164399, G1823588808, Neural mechanisms for inhibitory control over attention and working memory, Temporary connective architectures in mind and brain: role of functional connectivity in working memory, G2717104586, G2845524166, 'Premembering' Perception in the human brain., G4068022971, G4184838210, G4311792788, G4590856093, 'Premembering' Perception in the human brain., G5219700674, G5755594281, G5936681456, G6010411553, G6411030472, Brain Rhythms in Cognition, G6982605490, G7402751248, Wellcome Centre for Integrative Neuroimaging, ORA (Round 5): Hidden brain states underlying efficient representations in working memory, Stability of mind in a dynamic brain: Neural principles of working memory for flexible human cognition, G9000353647
OpenAlex ID: W3140972161