Measurement of a Visual Motion Aftereffect in the Rhesus Monkey

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Science  05 Apr 1963:
Vol. 140, Issue 3562, pp. 57-59
DOI: 10.1126/science.140.3562.57


A monkey was trained to discriminate between a shrinking and expanding test figure presented after steady fixation of the center of a rotating spiral. Differential shifts in the animal's perception of size constancy were found for clockwise and counter-clockwise rotation of the spiral. The magnitude of the aftereffect was within the range found in human subjects.