Human Performancemedium#933
The sequence of visual symptoms under increasing positive G is:
A
grey-out, then tunnel vision, then blackout, then G-LOC
CorrectB
blackout, then grey-out, then tunnel vision
C
red-out, then grey-out
D
no symptoms until unconsciousness
Explanation
As G increases: grey-out (peripheral vision dims) → tunnel vision → blackout (loss of vision) → G-LOC (unconsciousness).
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