Welbourne, Lauren E, Morland, Antony orcid.org/0000-0002-6754-5545 and Wade, Alex orcid.org/0000-0003-4871-2747 (2018) Population receptive field (pRF) measurements of chromatic responses in human visual cortex using fMRI. Neuroimage. pp. 84-94. ISSN 1053-8119
Abstract
The spatial sensitivity of the human visual system depends on stimulus color: achromatic gratings can be resolved at relatively high spatial frequencies while sensitivity to isoluminant color contrast tends to be more low-pass. Models of early spatial vision often assume that the receptive field size of pattern-sensitive neurons is correlated with their spatial frequency sensitivity - larger receptive fields are typically associated with lower optimal spatial frequency. A strong prediction of this model is that neurons coding isoluminant chromatic patterns should have, on average, a larger receptive field size than neurons sensitive to achromatic patterns. Here, we test this assumption using functional magnetic resonance imaging (fMRI). We show that while spatial frequency sensitivity depends on chromaticity in the manner predicted by behavioral measurements, population receptive field (pRF) size measurements show no such dependency. At any given eccentricity, the mean pRF size for neuronal populations driven by luminance, opponent red/green and S-cone isolating contrast, are identical. Changes in pRF size (for example, an increase with eccentricity and visual area hierarchy) are also identical across the three chromatic conditions. These results suggest that fMRI measurements of receptive field size and spatial resolution can be decoupled under some circumstances - potentially reflecting a fundamental dissociation between these parameters at the level of neuronal populations.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Elsevier B.V., 2017. |
Keywords: | Journal Article |
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 |
Funding Information: | Funder Grant number BBSRC (BIOTECHNOLOGY AND BIOLOGICAL SCIENCES RESEARCH COUNCIL) BB/p00724242/1 BBSRC (BIOTECHNOLOGY AND BIOLOGICAL SCIENCES RESEARCH COUNCIL) BB/L007770/1 |
Depositing User: | Pure (York) |
Date Deposited: | 22 Nov 2017 09:20 |
Last Modified: | 02 Jan 2025 00:09 |
Published Version: | https://doi.org/10.1016/j.neuroimage.2017.11.022 |
Status: | Published |
Refereed: | Yes |
Identification Number: | 10.1016/j.neuroimage.2017.11.022 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:124354 |
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Description: Population receptive field (pRF) measurements of chromatic responses in human visual cortex using fMRI
Licence: CC-BY 2.5