Theory 68/Balance/Threshold lens
Motion Sickness Needs Conflict
The claim
Motion sickness occurs above a threshold in the ratio of vestibular to visual motion signals, so passive motion in a still visual field is the worst case.
01Mechanism
The brain treats persistent mismatch as evidence of poisoning; the ratio determines whether the mismatch is tolerated.
02Prediction
Sickness should track the ratio.
03Refutation
Sickness tracking motion magnitude would remove the visual term.