tokens: RESULTS : Analysis by Pearson ' s correlation showed that the subjects who had higher scores of SSMS during the drum rotation generated the following : a ) a higher rating of over - all sickness ( r = 0 . 76 ) ; b ) a higher ratio of spectral power of EGG at 4 - 9 cycles per minute ( cpm ) between drum rotation and baseline periods ( r = 0 . 63 ) ; c ) a higher net percent increase of spectral power in the EEG frequency band 0 . 5 - 4 Hz between drum rotation and baseline periods on C3 ( r = 0 . 29 ) and C4 ( r = 0 . 31 ) ; d ) a higher ratio of spectral power of EEG frequency band 0 . 5 - 4 Hz between drum rotation and baseline periods on C3 ( r = 0 . 31 ) ; and e ) a higher level of net increase in skin conductance from baseline to drum rotation ( r = 0 . 30 ) .