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Asymmetries between achromatic and chromatic extraction of 3D motion signals

Research output: Contribution to journalArticle

Author(s)

Milena Kaestner, Ryan Maloney, Kirstie Wailes-Newson, Marina Bloj, Julie Harris, Anthony Morland, Alex Wade

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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 inter-ocular 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 novel evidence that MID mechanisms asymmetrically draw on information in pre-cortical pathways. An early opponent motion signal optimally conveyed by the S-cone pathway may provide a substantial contribution to the IOVD mechanism.
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Details

Original languageEnglish
Number of pages10
JournalProceedings of the National Academy of Sciences of the United States of America
VolumeLatest Articles
Early online date17 Jun 2019
DOIs
Publication statusE-pub ahead of print - 17 Jun 2019

    Research areas

  • 3D motion, Binocular vision, Color

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