Vestibular experiments in space.

Experiments were performed while monkeys flew in space in the ‘‘Cosmos/ Bion’’ Missions to determine the effect of microgravity on the oculomotor and vestibular systems. Eye-head coordination during gaze shifts to lateral targets (gaze fixation reaction, GFR) and multiunit activity in the medial vestibular nuclei (MVN) and cerebellar flocculus were studied in rhesus monkeys in the Bion 6 (Cosmos 1514) through Bion 11 projects. In the first few days of space flight, gaze displacement onto lateral targets became hypermetric, and the amplitude of head movements decreased. This was compensated for by 112

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