SEARCHING FOR HIDDEN INFORMATION WITH GABOR TRANSFORM IN GENERALIZED TONIC-CLONIC SEIZURES

The analysis of generalized tonic clonic seizures is usually difficult with scalp EEG due to muscle artifact. We applied Gabor Transform to evaluate 20 seizures from 8 consecutive patients admitted for video-EE G monitoring. We studied the relative intensity ratios of alpha, theta and delta bands over time. In 14/20 events we found a significant dec remental activity in the delta band at the onset of the seizure indica ting that this is dominated by theta and alpha bands. We conclude that GT is a useful auxiliary tool in the analysis of ictal activity that sheds light on the underlying pathophysiological mechanisms. (C) 1997 Elsevier Science Ireland Ltd.