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The Effect of Locomotion on Early Visual Contrast Processing in Humans
Alex V Benjamin1, Kirstie Wailes-Newson1, Anna Ma-Wyatt2
1Department of Psychology, University of York, York YO105DD, United Kingdom and.
Summary
Locomotion does not enhance visual processing in humans as it does in mice. Walking humans showed no change in contrast sensitivity or surround suppression, suggesting species-specific differences in how behavior impacts vision.
Area of Science:
- Neuroscience
- Vision Science
- Human Physiology
Background:
- Traditional vision research relies on immobile subjects, neglecting the role of locomotion.
- Recent studies in mice indicate locomotion enhances visual neuronal responses and alters gain control.
Purpose of the Study:
- To investigate if locomotion similarly affects early visual processing in humans.
- To compare human visual processing during walking with findings in mice.
Main Methods:
- Utilized psychophysics to assess contrast change detection during brisk walking.
- Employed steady-state electrophysiology to measure neuronal responses and surround suppression.
- Subjects walked on a treadmill while undergoing testing.
Main Results:
- Psychophysical tests revealed no significant change in contrast detection ability while walking.
- Electrophysiology data showed no increase in stimulus-driven neuronal responses or reduced surround suppression.
- Co-oriented flankers were more effective masks during locomotion.
Conclusions:
- Early visual contrast processing in humans is altered by locomotion, but differently than in mice.
- Locomotion's impact on low-level visual processing may be species-specific.
- Differences may reflect variations in arousal levels associated with locomotion.
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