CHANGES ON EEG DURING SIMULATED SATURATION DIVING

During N₂-O₂ simulated saturation at a depth of 36.5 m the frequency, amplitude and index of a waves decreased and the activities of β and θ wave increased on the EEGs at rest.After the pressure was decompressed to normal, they could recover to the predive level.During the air excursion diving at depths of 60 and 70 m, the paramenters of EEG approximated to those of N₂-O₂ exposure.But at that time of the air excursion diving at a depth of 75 m they appeared the maximum.This showed that the changes related to the nitrogen partial pressure.There was an increase in slow waves during the simulated N₂-O₂ saturation.The activities of slow wave decreased on the EEGs in case of hyperventilation.The photic stimulation to the eyes caused the slow wave to disappear, and a rhythm could recover temporarily.When the photic stimulation was over the flow rhythm reappeared on the EEG.