Lowndes, Rebecca, Welbourne, Lauren, Williams, Molly et al. (3 more authors) (2023) Increasing spatial frequency of S-cone defined gratings reduces their visibility and brain response more than for gratings defined by L-M cone contrast. Vision Research. 108209. ISSN 0042-6989
Abstract
Chromatic sensitivity reduces as spatial frequency increases. Here, we explore the behavioural and neuronal responses to chromatic stimuli at two spatial frequencies for which the difference in sensitivity will be greater for S-cone than L-M stimuli. Luminance artefacts were removed using the Random Luminance Modulation (RLM) technique. As expected, doubling the spatial frequency increased the detection threshold more for S-cone than for isoluminant L-M gratings. We then used fMRI to measure the cortical BOLD responses to the same two chromatic stimuli (S and L-M) at the same two spatial frequencies. Responses were measured in six visual areas (V1, V2, V3, V3a, hV4, TO1/2). We found a significant interaction between spatial frequency in V1, V2 and V4 suggesting that the behaviourally observed increase in contrast threshold for high spatial frequency S-cone stimuli is reflected in these retinotopic areas. Our measurements show that neural responses consistent with psychophysical behaviour in a colour detection task can be observed as early as primary visual cortex.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023 The Author(s). |
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 |
Depositing User: | Pure (York) |
Date Deposited: | 23 Mar 2023 13:30 |
Last Modified: | 19 Oct 2024 00:12 |
Published Version: | https://doi.org/10.1016/j.visres.2023.108209 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.visres.2023.108209 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:197670 |
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Description: Increasing spatial frequency of S-cone defined gratings reduces their visibility and brain response more than for gratings defined by L-M cone contrast
Licence: CC-BY 2.5