Computed EEG topography in epilepsy.

Computed EEG Topography (CET) of 74 cases of epilepsy demonstrates the potential utility of this method beyond that of the analog EEG for the quantification and localization of regions of epileptogenesis. For the detection and localization of focal epilepsy, CET was equal to or better than the EEG in 77 p. 100 of cases and provided more evidence of focal abnormality in 8.5 p. 100. The topography of spectral power and of early and late, extravisual, components of the averaged evoked potential to flash were abnormal in the region of interictal spike activity.