Test flash intensity and variability of fixation by the rhesus monkey.
D000818:Animals; D001522:Behavior, Animal; D005403:Fixation, Ocular; D005584:Fovea Centralis / Q000502:physiology; D005829:Geniculate Bodies / Q000502:physiology*; D000882:Haplorhini; D008253:Macaca mulatta; D010775:Photic Stimulation