title: Functional representation of eye movements in the flocculus of monkeys (Macaca fuscata).
abstract: The flocculus of the monkey was mapped with microstimulation methods in chronic preparations. Three types of low threshold, disconjugate eye movements were elicited: (1) a lateral deviation of the ipsilateral eye, (2) a downward deviation of the ipsilateral eye and (3) counterclockwise rotation of the ipsilateral eye. Horizontal eye movements were obtained from folia 2, 3, 4 and 6-10 of the flocculus, and the region eliciting horizontal eye movements was traced in the sagittal plane over a distance of 4 mm in one animal. However, sites flanking these horizontal movement sites produced either vertical movements, rotatory movements or failed to produce a movement of either eye. These findings suggest a zonal organization of flocculus functions in monkeys that is consistent with the differential projections of flocculo-vestibular connections revealed by retrograde tracing studies [2].
mesh_terms: D000818:Animals; D001931:Brain Mapping; D002525:Cerebellar Cortex / Q000502:physiology*; D004558:Electric Stimulation; D005133:Eye Movements; D008251:Macaca; D011817:Rabbits