HUMAN OCULAR TORSION DURING PARABOLIC FLIGHTS: AN ANALYSIS WITH SCLERAL SEARCH COIL

Authors
  1. Cheung, B.S.K.
  2. Money, K.
  3. Howard, I.
  4. Kirienko, N.
  5. Johnson, W.
  6. and others
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN);York Univ, North York ONT (CAN) Human Performance in Space Lab;Canadian Space Agency, Ottawa ONT (CAN);Saint Michael's Hospital, Toronto ONT (CAN)
Abstract
Rotation of the eyes about the visual axis is known as ocular torsion. A lateral inclination (a "roll") of the head induces ocular torsion in the opposite direction, a response known as ocular counterrolling. For six subjects, we recorded the static (head still) and dynamic (head in oscillatory roll motion) ocular torsion in normal 1 g condition and also during the microgravity and hypergravity periods of parabolic flight, using the electromagnetic scleral search coil technique. With the head still, the direction and magnitude of torsion that occured in response to microgravity and hypergravity differed substantially from one individual to another, but there was a significant difference in torsional magnitude between the microgravity and hypergravity periods, for all static head position including the upright position.
Report Number
DCIEM-91-79 — Reprint
Date of publication
15 Oct 1991
Number of Pages
10
Reprinted from
Experimental Brain Research, vol 90, 1992, p 180-188
DSTKIM No
92-03581
CANDIS No
127232
Format(s):
Hardcopy;Originator's fiche received by DSIS

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