>> But that just causes a weird feeling, not nausea. Your eyes may be at
>> dissonance with reason, but reason is presumably the highest-level
>> function of the brain, whereas nausea is among the most fundamental
>> functions, that there is no such thing as nausea from a dissonance
>> between perception and reason.
>
> Can't they just train the astronauts to not suffer from this type of
> nausea as much? Or at least have it impact their functionality less.
> Being able to launch with slightly less fuel requried seems quite a
> strong goal to me.

Not really.  It actually comes from the cerebellum and is pretty much a 
reflex.  Your eyes and inner ear disagree, and ever since we were 
dinosaurs, that could only mean one thing "Oh! crap, I've been 
poisoned!" and the reflex is to evacuate the toxin, by sweating and/or 
vomitting.

They teach astronauts to try to compensate for it, but it's not always 
easy, and it used to be easier just to screen them before sending them 
to outer space.  There's one (whose name escapes me at the moment) who 
had to have one of his ear nerves completely severed, making him deaf on 
that side at the same time, to resolve the issue.


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