AN ANALYSIS OF CARP CEREBELLAR EEG UNDER THE MICROGRAVITATIONAL ENVIRONMENT

To confirm the plausibility of the sensory conflict hypothesis for spa ce motion sickness, a space experiment was carried out in 1992 as NASA 's Spacelab-J mission. In the experiment, the dorsal light tilt reacti on (DLTR) of carp was observed and the corresponding cerebellar EEG wa s recorded. The purpose of this study is to evaluate the effects of ch ange in gravitational environment on the EEG by means of spectrum anal ysis. In order to make a reliable conclusion, a procedure was establis hed which consists of preprocessing, spectrum estimation and evaluatio n of the spectrum based on statistics. By applying this procedure, bot h the effects due to change in gravitational environment and the adapt ation of the carp to the weightlessness environment in terms of differ ences in EEG spectrum are revealed. This result supports the sensory c onflict hypothesis for space motion sickness.