Dl. Harm et al., CHANGES IN COMPENSATORY EYE-MOVEMENTS ASSOCIATED WITH SIMULATED STIMULUS CONDITIONS OF SPACEFLIGHT, Aviation, space, and environmental medicine, 64(9), 1993, pp. 820-826
Compensatory vertical eye movement gain (CVEMG) was recorded during pi
tch oscillation in darkness before, during and immediately after expos
ures to the stimulus rearrangement produced by the Preflight Adaptatio
n Trainer (PAT) Tilt-Translation Device (TTD). The TTD is designed to
elicit adaptive responses that are similar to those observed in microg
ravity-adapted astronauts. The data from Experiment 1 yielded a statis
tically significant CVEMG decrease following 15 min of exposure to a s
timulus rearrangement condition where the phase angle between subject
pitch tilt and visual scene translation was 270-degrees, statistically
significant gain decreases were not observed following exposures eith
er to a condition where the phase angle between subject pitch and scen
e translation was 90-degrees or to a no-stimulus-rearrangement conditi
on. Experiment 2 replicated the 270-degrees-phase condition from Exper
iment 1 and extended the exposure duration from 30 to 45 min. Statisti
cally significant additional changes in CVEMG associated with the incr
eased exposure duration were not observed. The adaptation time constan
t estimated from the combined data from Experiments 1 and 2 was 29 min
.