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Tracking and perceiving diverse motion signals: Directional biases in human smooth pursuit and perception

View ORCID ProfileXiuyun Wu, Miriam Spering
doi: https://doi.org/10.1101/2022.05.16.492206
Xiuyun Wu
1Graduate Program in Neuroscience, University of British Columbia, Vancouver, BC, Canada
2Department of Ophthalmology & Visual Sciences, University of British Columbia, Vancouver, BC, Canada
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  • For correspondence: xiuyunwu@student.ubc.ca
Miriam Spering
1Graduate Program in Neuroscience, University of British Columbia, Vancouver, BC, Canada
2Department of Ophthalmology & Visual Sciences, University of British Columbia, Vancouver, BC, Canada
3Djavad Mowafaghian Center for Brain Health, University of British Columbia, Vancouver, BC, Canada
4Institute for Computing, Information and Cognitive Systems, University of British Columbia, Vancouver, BC, Canada
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Abstract

Human smooth pursuit eye movements and motion perception behave similarly when observers track and judge the motion of simple objects, such as dots. But moving objects in our natural environment are complex and contain internal motion. We ask how pursuit and perception integrate the motion of objects with motion that is internal to the object. Observers (n = 20) tracked a moving random-dot kinematogram with their eyes and reported the object’s perceived direction. Objects moved horizontally with vertical shifts of 0, ±3, ±6, or ±9° and contained internal dots that were static or moved ±90° up/down. Results show that whereas pursuit direction was consistently biased in the direction of the internal dot motion, perceptual biases differed between observers. Interestingly, the perceptual bias was related to the magnitude of the pursuit bias (r = 0.75): perceptual and pursuit biases were directionally aligned in observers that showed a large pursuit bias, but went in opposite directions in observers with a smaller pursuit bias. Dissociations between perception and pursuit might reflect different functional demands of the two systems. Pursuit integrates all available motion signals in order to maximize the ability to monitor and collect information from the whole scene. Perception needs to recognize and classify visual information, thus segregating the target from its context. Ambiguity in whether internal motion is part of the scene or contributes to object motion might have resulted in individual differences in perception. The perception-pursuit correlation suggests shared early-stage motion processing or perception-pursuit interactions.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • https://osf.io/7bc8j/

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted May 18, 2022.
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Tracking and perceiving diverse motion signals: Directional biases in human smooth pursuit and perception
Xiuyun Wu, Miriam Spering
bioRxiv 2022.05.16.492206; doi: https://doi.org/10.1101/2022.05.16.492206
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Tracking and perceiving diverse motion signals: Directional biases in human smooth pursuit and perception
Xiuyun Wu, Miriam Spering
bioRxiv 2022.05.16.492206; doi: https://doi.org/10.1101/2022.05.16.492206

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