Vection発生時の2次元脳電図の多変量分散分析による解析

概要

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Purpose: The authors analyzed EEG topography while subjects experienced vection, or visuallyinduced false sensation of self movement. Methods: Nine healthy male medical students were exposed to a rotating image, which evoked circular vection around fore-aft axis for 16 seconds. EEG was recorded from 12 electrodes to make topographical maps by unbiased polynomial interpolation. Since a coefficient vector used for the interpolation has a one-to-one correspondence to a topographical map, the differences in topographical maps were analyzed by multivariate analysis of variance (MANOVA) of the coefficient vectors. Results: MANOVA demonstrated significant changes in EEG topography in high a band when subjects sensed vection. Although no relationship between the topographical map patterns and higher mental functions was demonstrated, it is interesting that subjects who did not experience vection frequently showed no topographical changes as is shown by MANOVA. Conclusion: The study confirmed the recent findings of the authors that the cerebral activities due to the spatial disorientation can be analyzed by means of EEG, and the changes are observed in high a band.
1999-11-25