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Corollary Discharge

Definition

A term coined by Roger Sperry in 1950, who studied the opto-motor response in fish. It states that any eye motion that will cause displacement of the visual image on the retina will have "a corollary discharge into the visual centers to compensate for retinal displacement." This allows the animal to determine whether image motions on the retina were caused by movements of the object or by eye movements of the animal itself. The same principle was simultaneously and independently discovered by