Motion Sickness
Motion sickness arises when the input from our 3 senses - vision, the position of our joints (proprioception), and the balance organs - becomes uncoordinated. This can happen when, for example, we are on the sea and the motion of the boat, which we feel through our feet, does not match up with the horizon that we see, or the movement of our head. We become nauseated (the word for nausea and the word for nautical come from the same root). One way to help this is to remove one of the sources of input, which is why it helps to close our eyes. Another way is to take agents to suppress the activity of labyrinth, contained in many seasickness pills.
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