Analysis of cerebral bioelectrical activity during the compression phase of a saturation dive.

Considering previous studies on EEC brain mapping in the course of saturation dives, the authors studied the same standards of EEG performance during the compression phase of saturation dive reaching -250 m. An increase of theta and beta rhythms was observed, especially in the midline anterior regions of the brain, during the entire compression period, while an increase of delta activity was noted only at -100 m. These results confirm our hypothesis that the compression profile is physiologically correct, because the EEG modifications decreased during the stay at maximum depth.