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Inhibitory interaction between channels sensitive to direction and velocity in the human visual system
1Appalachian State University, Department of Psychology, Boone, NC 28608.
Perceptual and Motor Skills
|October 1, 1987
Summary
This study investigated perceived velocity changes using two experimental paradigms. Oppositely directed motion did not involve lateral inhibition, but rather broad field inhibition, impacting perceived velocity.
Area of Science:
- Visual Perception
- Motion Perception
- Psychophysics
Background:
- Two paradigms exist for studying velocity contrast: field-wide changes and juncture changes.
- Previous research suggested lateral interaction for same-direction motion.
Purpose of the Study:
- To investigate perceived velocity changes with oppositely directed motion.
- To differentiate between lateral and field-wide inhibitory mechanisms.
Main Methods:
- Employed two paradigms: one examining perceived velocity across a field, the other at the juncture of disparate velocities.
- Focused experiments on oppositely directed motion.
Main Results:
- Using the juncture paradigm, oppositely directed motion's effect on perceived velocity was not due to lateral inhibition.
- Using the field-wide paradigm, perceived velocity changes involved inhibition across the entire motion field.
Conclusions:
- Lateral inhibitory interactions do not explain perceived velocity changes for oppositely directed motion.
- Inhibition across entire fields of motion influences perceived velocity when directions oppose.