Abstract
Imaging procedures have been used for many years and are becoming increasingly important in a number of medical disciplines. This is due to recent technological advances, primarily computerization. The methods employed in CNS diagnostics are both cerebral morphology and cerebral function, such as CT, MRI, PET, and SPECT. Topographic mapping of EEG (evoked potentials) represents one of the functional procedures and permits topographic imaging of EEG. These techniques are completely noninvasive and have extremely short analysis time (in the millisecond range). One of the our recent experiances as for dizziness was presented. A topographic display of the skull EEG was used during simulated underwater experiments to determine; 1) Whether there are any characteristic EEG patterns in high pressure nervous syndrome (HPNS) 2) the relationship between the EEG changes and the characteristic signs and symptoms of HPNS. Some of the results revealed that frontal midline theta activity was associated mostly with some of the characteristic patterns of HPNS, such as a transient episode of euphoria, dizziness or tremor at depths grater than 21 ATA. And thus it was concluded that this frontal midline theta rhytm may have some correlation to the thalamus.
