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Studies of Vestibular Primary Afferents in Normal, Hyper- and Hypogravity (COS 2044-40)
Principal Investigator
Research Area:
Species Studied
Scientific Name: Macaca mulatta Species: Monkey Strain: Rhesus


This study was conducted to determine if the task of making numerous coordinated active horizontal eye and head movements during space flight modified the response of vestibular primary afferents to controlled passive rotations. Since a multi-axis rotator could not be placed on the spacecraft, it was assumed that if these afferents could be tested immediately post flight, information could be obtained about the dynamic properties of the horizontal semicircular canals before they recalibrated to the terrestrial gravitational environment.

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Correia, M.J. et al.: Changes in Monkey Horizontal Semicircular Canal Afferent Responses After Spaceflight. Journal of Applied Physiology, supl., vol. 73, no. 2, 1992, pp. S112-S120.

Correia, M.J. et al.: Studies of Vestibular Primary Afferents and Eye Movements in Normal, Hyper- and Hypogravity-AXON. Final Reports of the U.S. Experiments Flown on the Soviet Biosatellite Cosmos 2044. Vol. 2. J.P. Connolly, R.E. Grindeland, and R.W. Ballard, eds., NASA TM-108802, 1994, pp. 305-332.

Correia, M.J. et al.: Vestibular Primary Afferent and Vestibulo-ocular Changes in Rhesus Monkey Following 14 Days of Microgravity. Soc. Neurosci. Abst., vol. 16, 1990, p. 735.

Action potentials
Adaptation, physiological
Eye movements
Head movements
Neurons, afferent
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Data Information
Data Availability
Archive is complete. No data sets are available for this experiment. Please Contact LSDA if you know of available data for this investigation.

Activity, eye movement, Nystagmus, slow phase velocity. primate, Microelectrode recording
Activity, pulse, Finger cot sensor, recorder, pulses/minute
Behavior, Eye position, primate, Off-vertical axis rotation (OVAR) , scleral search coils, measurement
Electrooculogram (EOG)
Off-vertical axis rotation (OVAR)
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Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Cosmos 2044 09/15/1989 09/29/1989 14 days

Additional Information
Managing NASA Center
Ames Research Center (ARC)
Responsible NASA Representative
Ames Research Center LSDA Level 3
Project Manager: Sylvain Costes
Institutional Support
National Aeronautics and Space Administration (NASA)
Alternate Experiment Name
Protocol / Approach
Proposal Date
Proposal Source
Hardware Items