"Still, like the common cold, there may be no single explanation for motion sickness. Neither he nor anyone else has explained why there should be any subjective consequences to getting in a car, or why we maintain a lifelong talent for riding a bicycle while even experienced sailors struggle at sea after months on land."
http://well.blogs.nytimes.com/2013/09/23/rethinking-motion-sickness/?ref=health&_r=0