Himmelberg, Marc Mason orcid.org/0000-0001-9133-7984 and Wade, Alexander Robert Patrick orcid.org/0000-0003-4871-2747 (2019) Eccentricity-dependent temporal contrast tuning in human visual cortex measured with fMRI. Neuroimage. pp. 462-474. ISSN 1053-8119
Abstract
Cells in the peripheral retina tend to have higher contrast sensitivity and respond at higher flicker frequencies than those closer to the fovea. Although this predicts increased behavioural temporal contrast sensitivity in the peripheral visual field, this effect is rarely observed in psychophysical experiments. It is unknown how temporal contrast sensitivity is represented across eccentricity within cortical visual field maps and whether such sensitivities reflect the response properties of retinal cells or psychophysical sensitivities. Here, we used functional magnetic resonance imaging (fMRI) to measure contrast sensitivity profiles at four temporal frequencies in five retinotopically-defined visual areas. We also measured population receptive field (pRF) parameters (polar angle, eccentricity, and size) in the same areas. Overall contrast sensitivity, independent of pRF parameters, peaked at 10Hz in all visual areas. In V1, V2, V3, and V3a, peripherally-tuned voxels had higher contrast sensitivity at a high temporal frequency (20Hz), while hV4 more closely reflected behavioural sensitivity profiles. We conclude that our data reflect a cortical representation of the increased peripheral temporal contrast sensitivity that is already present in the retina and that this bias must be compensated later in the cortical visual pathway.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 The Authors. Published by Elsevier Inc. |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Psychology (York) > York Neuroimaging Centre The University of York > Faculty of Sciences (York) > Psychology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 19 Sep 2018 08:50 |
Last Modified: | 14 Mar 2025 00:07 |
Published Version: | https://doi.org/10.1016/j.neuroimage.2018.09.049 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.neuroimage.2018.09.049 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:135910 |
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