Topographic Characteristics of EEG During a Saturation Dive to a 31 ATA Helium-Oxygen Environment with Specific Reference to Fmθ or FIRDA
There are many electrophysiological studies concerning saturation excursion dives in hyperbaric environments, that reveal an increase in the theta wave (Procter et al. 1972; Bennett et al. 1982; Naquet et al. 1984). However, in traditional electroencephalography (EEG), no detailed analyses have been done to clarify the nature of the theta wave in this situation because of the restrictions imposed by the environment and the limitations associated with the induction electrode. Therefore, it is necessary to adopt a multielectrode induction recording system. Using the 16-channel recording system we developed (Ueno and Matsuoka 1975), a topographic display of the EEG has been employed to conduct underwater experiments in an attempt to establish the changes occurring in the EEG (in all frequency bands) at different sea depths and to establish a correlation between the regions in which these changes occur.
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