Why do people puke on plane, boat, etc? One person told me it's sicological, is that true?
by 
Tanya G
ANSWERS: 4
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Nope, that's called motion sickness. Basically what happens is that the motion-sensing part of your nervous system (in the inner ears) is sending your brain information that contradicts what you're seeing through your eyes. Your brain thinks "that's odd. I must have eaten something poisonous" and tells your digestive system to get rid of whatever your recently ate. I'm lucky enough to not suffer from it. But I know people who do and it isn't fun for them. http://en.wikipedia.org/wiki/Motion_sickness
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the word is psychological, and it can be. it can be a response to fear. but it is more likely a physical reaction that is stronger in some than in others. Here is how it is described in Wikipedia: Airsickness is a sensation which is induced by air travel. It is a specific form of motion sickness, and is considered a normal response in healthy individuals. Airsickness occurs when the central nervous system receives conflicting messages from the body (including the inner ear, eyes and muscles) affecting balance and equilibrium. The inner ear is particularly important in the maintenance of balance and equilibrium because it contains sensors for both angular (rotational) and linear motion. Airsickness is usually a combination of spatial disorientation, nausea and vomiting. Experimentally, airsickness can be eliminated in monkeys by removing part of the cerebellum, namely the nodulus of the vermis. ===== however, I do not think that many humans would like to have part of their brains removed in order to travel more easily, so chewing gum helps.
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The same reason the playground merry-go round would make me quickly nauseus. Motion sickness. That fluid in the ears related to balance and spatial orientation gets easily upset in some folks.
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cause they get motion sickness
Roaring 
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