Lowndes, Rebecca, Aveyard, Richard, Welbourne, Lauren E et al. (2 more authors) (2024) In primary visual cortex fMRI responses to chromatic and achromatic stimuli are interdependent and predict contrast detection thresholds. Vision Research. 108398. ISSN 0042-6989
Abstract
Chromatic and achromatic signals in primary visual cortex have historically been considered independent of each other but have since shown evidence of interdependence. Here, we investigated the combination of two components of a stimulus; an achromatic dynamically changing check background and a chromatic (L-M or S cone) target grating. We found that combinations of chromatic and achromatic signals in primary visual cortex were interdependent, with the dynamic range of responses to chromatic contrast decreasing as achromatic contrast increased. A contrast detection threshold study also revealed interdependence of background and target, with increasing chromatic contrast detection thresholds as achromatic background contrast increased. A model that incorporated a normalising effect of achromatic contrast on chromatic responses, but not vice versa, best predicted our V1 data as well as behavioural thresholds. Further along the visual hierarchy, the dynamic range of chromatic responses was maintained when compared to achromatic responses, which became increasingly compressive.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The Author(s). |
Keywords: | Humans,Color Perception/physiology,Contrast Sensitivity,Magnetic Resonance Imaging,Primary Visual Cortex,Photic Stimulation |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Psychology (York) The University of York > Faculty of Sciences (York) > Psychology (York) > York Neuroimaging Centre The University of York > Faculty of Sciences (York) > Physics (York) |
Depositing User: | Pure (York) |
Date Deposited: | 19 Apr 2024 10:50 |
Last Modified: | 22 Oct 2024 00:09 |
Published Version: | https://doi.org/10.1016/j.visres.2024.108398 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.visres.2024.108398 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:211657 |
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Description: In primary visual cortex fMRI responses to chromatic and achromatic stimuli are interdependent and predict contrast detection thresholds
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