How does the visual system differentiate between object motion and retinal motion? How is retinal motion minimized?
What will be an ideal response?
Answer: The Corollary Discharge Theory: movement perception depends on three signals.
-Image displacement signal occurs when an object moves across the retina.
-Motor signal is when a signal sent to the eyes to move the eye muscles (photoreceptors in the retina move bc the eye moved).
-Corollary Discharge signal: copy of the motor signal that is sent to the brain.
For object motion: the object moves in front of the retina, the comparator receives one signal (image displacement) and then tells the brain there is motion
For retinal motion: photoreceptors in the retina move bc eye moved. The comparator receives two signals, image displacement and copy of the motor signal. This tells the brain that there is no real motion
Retinal motion is minimized by saccadic suppression. This is the reduction of visual sensitivity that occurs when we make saccadic eye movements. It eliminates the smear from retinal image motion during eye movements
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