Kaestner, Milena, Maloney, Ryan T, Wailes-Newson, Kirstie H et al. (4 more authors) (2019) Asymmetries between achromatic and chromatic extraction of 3D motion signals. Proceedings of the National Academy of Sciences of the United States of America. pp. 13631-13640. ISSN 1091-6490
Abstract
Motion in depth (MID) can be cued by high-resolution changes in binocular disparity over time (CD), and low-resolution interocular velocity differences (IOVD). Computational differences between these two mechanisms suggest that they may be implemented in visual pathways with different spatial and temporal resolutions. Here, we used fMRI to examine how achromatic and S-cone signals contribute to human MID perception. Both CD and IOVD stimuli evoked responses in a widespread network that included early visual areas, parts of the dorsal and ventral streams, and motion-selective area hMT+. Crucially, however, we measured an interaction between MID type and chromaticity. fMRI CD responses were largely driven by achromatic stimuli, but IOVD responses were better driven by isoluminant S-cone inputs. In our psychophysical experiments, when S-cone and achromatic stimuli were matched for perceived contrast, participants were equally sensitive to the MID in achromatic and S-cone IOVD stimuli. In comparison, they were relatively insensitive to S-cone CD. These findings provide evidence that MID mechanisms asymmetrically draw on information in precortical pathways. An early opponent motion signal optimally conveyed by the S-cone pathway may provide a substantial contribution to the IOVD mechanism.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Copyright © 2019 the Author(s). Published by PNAS. |
Keywords: | 3D motion,Binocular vision,Color |
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) > Biology (York) |
Depositing User: | Pure (York) |
Date Deposited: | 24 Jun 2019 14:50 |
Last Modified: | 04 Nov 2024 01:20 |
Published Version: | https://doi.org/10.1073/pnas.1817202116 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | 10.1073/pnas.1817202116 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:147691 |
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