====== 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 : [[https://www.researchgate.net/publication/15357968_The_possible_role_of_nystagmus_in_motion_sickness_A_hypothesis|The possible role of nystagmus in motion sickness: A hypothesis]] {{:oa_padlock_grn.png?16&nolink|Open Access}}//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."__

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Also see : [[content:medicine:diseases:m-q:mal_de_debarquement]]