motion sickness

Have you ever been riding in a car while trying to read? After a few minutes you most probably start to feel sick. Why is that? When your eyes are reading the words the light bounces off the paper goes into your eyes. The lens help it land on the retina where it is transduced into a neural message by the rods and cones. When your brain receives this message, it sees the paper as standing still; it is not moving. But your ears are telling your brain a different message. The semicircular canals in your ears play a huge role in keeping a person balanced. There is liquid in the canals that sloshes around to tell us we are moving or off balance. While we are in the car we are bouncing so our ears tell our brains that we are moving, but like I said before the eyes told the brain everything was still. The brain does not know how to interpret these two bits of info and it causes the person to feel nauseous. 

interestingly enough the liquid in your ears is what also make s a perso dizzy. When you spin around the liquid in your ears goes nuts and it tells your brain your are spinning but when you stop spinning it takes time for the liquid to calm down. Dizziness is the state where you have stopped spinning but your ears tell your brain that you are still spinning because the liquid is still moving around.