Entrainment to the CIECAM02 and CIELAB colour appearance models in the human cortex

Thwaites, Andrew and Wingfield, Cai and Wieser, Eric and Soltan, Andrew and Marslen-Wilson, William D and Nimmo-Smith, Ian (2018) Entrainment to the CIECAM02 and CIELAB colour appearance models in the human cortex. Vision Research, 145. 1–10. ISSN 0042-6989

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In human visual processing, information from the visual field passes through numerous transformations before perceptual attributes such as colour are derived. The sequence of transforms involved in constructing perceptions of colour can be approximated by colour appearance models such as the CIE (2002) Colour Appearance Model, abbreviated as CIECAM02. In this study, we test the plausibility of CIECAM02 as a model of colour processing by looking for evidence of its cortical entrainment. The CIECAM02 model predicts that colour is split into two opposing chromatic components, red-green and cyan-yellow (termed CIECAM02-a and CIECAM02-b respectively), and an achromatic component (termed CIECAM02-A). Entrainment of cortical activity to the outputs of these components was estimated using measurements of electro- and magnetoencephalographic (EMEG) activity, recorded while healthy subjects watched videos of dots changing colour. We find entrainment to chromatic component CIECAM02-a at approximately 35 ms latency bilaterally in occipital lobe regions, and entrainment to achromatic component CIECAM02-A at approximately 75 ms latency, also bilaterally in occipital regions. For comparison, transforms from a less physiologically plausible model (CIELAB) were also tested, with no significant entrainment found.

Item Type:
Journal Article
Journal or Publication Title:
Vision Research
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This is the author’s version of a work that was accepted for publication in Vision Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Vision Research, 145, 2018 DOI: 10.1016/j.visres.2018.01.011
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Deposited On:
12 Apr 2018 14:52
Last Modified:
31 Oct 2023 01:02