Application of brain electric activity mapping for analysis of discharge propagation in epileptic patients.

The brain electric activity mapping (BEAM) method was used for diagnostic purposes in patients who revealed the episodic paroxysmal activity in electroencephalographic records. The spectral features of brain spontaneous activity in the absence of the seizures demonstrated the topography similar to the seizure wave front propagation pathways observed in dynamic potential mapping. The cortical areas characterized by the increased ability to generate slow waves at certain frequencies revealed at the same time tendency for epileptic activity generation. The neuronal mechanism involved seems to be of resonance character as this correspondence is not observed when the power density distribution averaged in classical EEG frequency bands is analysed.