Localization and detection of visual stimuli following superior colliculus lesions in rhesus monkeys.
Rhesus monkeys were trained to fixate a central stimulus and to detect and localize a 50 msec light flash presented 6-80 degrees on either side of the central stimulus. Following large lesions of the superior colliculus, they showed persistent deficits in localizing flashes presented 43-80 degrees from the fixation stimulus. However, they were not consistently impaired when the flashes were presented more centrally, and their performance with peripheral stimuli improved when the stimulus duration was 1 sec. Thus, the superior colliculus appears to be necessary for the localization of brief visual stimuli in the far periphery.
D000818:Animals; D004193:Discrimination Learning / Q000502:physiology; D000882:Haplorhini; D008253:Macaca mulatta; D009048:Motor Skills / Q000502:physiology; D009949:Orientation / Q000502:physiology; D010775:Photic Stimulation; D012438:Saccades; D013477:Superior Colliculi / Q000502:physiology*; D014794:Visual Fields; D014796:Visual Perception / Q000502:physiology*