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    Asymmetries between achromatic and chromatic extraction of 3D motion signals

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    Publication date
    2019-07
    Author
    Kaestner, M.
    Maloney, R.T.
    Wailes-Newson, K.H.
    Bloj, Marina
    Harris, J.M.
    Morland, A.B.
    Wade, A.R.
    Keyword
    3D motion
    Binocular vision
    Colour
    Research Development Fund Publication Prize Award
    Rights
    © 2019 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).
    Peer-Reviewed
    Yes
    
    Metadata
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    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.
    URI
    http://hdl.handle.net/10454/17152
    Version
    Published version
    Citation
    Kaestner M, Maloney RT, Wailes-Newson KH et al (2019) Asymmetries between achromatic and chromatic extraction of 3D motion signals. PNAS. 116(27): 13631-13640.
    Link to publisher’s version
    https://doi.org/10.1073/pnas.1817202116
    Type
    Article
    Notes
    Research Development Fund Publication Prize Award winner, May 2019.
    Collections
    Life Sciences Publications

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