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Double dissociation in radial and rotational motion sensitivity.
Nestor Matthews1, Leslie Welch2, Elena K Festa2
1Department of Psychology, Denison University, Granville, OH, United States of America.
Plos One
|January 28, 2021
Summary
This study reveals distinct processing for radial and rotational motion in the human visual system. New experiments demonstrate separate dependencies for global depth and local luminance, proving their independence.
Area of Science:
- Neuroscience
- Visual Perception
- Psychophysics
Background:
- The primate visual system shares neural regions for radial and rotational motion.
- Similarities exist in computational features despite shared neural substrates.
- Previous research showed a single dissociation in motion sensitivity.
Purpose of the Study:
- To extend the single dissociation to a double dissociation for radial and rotational motion sensitivity.
- To demonstrate the separability of radial and rotational motion processing.
- To identify distinct dependencies for radial and rotational motion perception.
Main Methods:
- Experiments used bilateral plaid stimuli with phase-noise, manipulated for radial or rotational motion.
- Participants performed temporal order judgments (TOJs) and simultaneity judgments (SJs).
- Stimuli varied in motion direction (same vs. opposite initial directions).
Main Results:
- Phase noise significantly disrupted rotational motion judgments more than radial motion judgments, establishing a double dissociation.
- This pattern held for both TOJs and SJs, confirming distinct processing.
- Radial motion sensitivity relied on global depth, while rotational motion sensitivity depended on local luminance gradients.
Conclusions:
- Radial and rotational motion sensitivities are independent processes.
- These distinct dependencies emerge downstream from initial motion component detection.
- The findings differentiate visual processing of complex motion types.
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