ABSTRACT
Tolerance develops to a particular motion, and a person may become acclimatized to specic conditions. If there is a change in the intensity or nature of the motion, the individual may again be susceptible. Continuous exposure to constant conditions usually produces tolerance within 2 to 3 days. Tolerance can also develop to repeated shorter exposures. ere is a central nervous system habituation to such a degree that aer the person disembarks and the motion is stopped, the person feels that he or she is rocking at the frequency of the original ship exposure.
