eli5: what makes people throw up when driving up a hill when they wouldn’t throw up during a normal drive?

Question

eli5: what makes people throw up when driving up a hill when they wouldn’t throw up during a normal drive?

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Answer 1

If you’re driving up a hill everything “looks” flat because you’re tilted along with the hill. So your eyes say “we are driving on a flat plane” but gravity tells your body “you are going up a hill.” This discrepancy between sensory inputs confuses your brain and is similar to symptoms of certain kinds of toxins that we have evolved responses to. So your brain thinks, “oh shit, we’ve ingested some sort of poison, better puke it out.”