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Motion sickness
Dizziness and nausea is frequently caused by unusual physical motion (or perceived motion) - e.g. air sickness, sea sickness, car sickness, VR simulation sickness etc etc.
There are three commonly-documented versions :
- Caused by motion that is felt but not seen
- Caused by motion that is seen but not felt
- Caused when both systems detect motion but they do not correspond
There are currently two main theories about why this might happen :
The first is that it's a mistaken defence against neurotoxins, in other words an emetic effect designed to eliminate ingested toxins which (can) have very similar dizziness-inducing effects.
The second theory is the 'Nystagmus Hypothesis' which is explained here in : The possible role of nystagmus in motion sickness: A hypothesis Aviation Space and Environmental Medicine, 65(11):1032-5 · December 1994.
In which the authors note, however :
"[…] the mechanism by which vestibular stimulation ultimately leads to motion-sickness signs and symptoms, including emesis, has by no means been established."
Also see : Mal de debarquementplugin-autotooltip__plain plugin-autotooltip_bigMal de debarquement
Mal de debarquement Syndrome (MdDS) is associated with Motion sickness i.e. sickness caused by the movement of sea air and land travel - except that it's experienced after the individual returns to the stability of dry land.
It's a persistent form of 'Land sickness' which many people experience for short periods after disembarking from a voyage.
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