Abstract
The BION program with primates included 2 vestibular studies one was focused on coordination of the eye and head movements and activities of the medial vestibular nuclei and cerebellum flocculus during angular head movements in the horizontal plane for gaze fixation and the other, on the central vestibular neurons and otolith-induced cardiac rhythm reaction during linear displacement about the body axis. Sensitivity of the central vestibular neurons to both angular and linear accelerations was found to increase at the beginning of microgravity and then normalized gradually, whereas the flocculus activity remained high throughout the mission.
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