I. Rektor et M. Svejdova, SPATIOTEMPORAL ANALYSIS OF INTERICTAL EPILEPTIC SPIKES - A STEREOELECTROENCEPHALOGRAPHIC STUDY, Neurophysiologie clinique, 25(1), 1995, pp. 12-18
Interictal epileptic spikes (IES) were recorded and averaged in 4-15 c
hannels, in seven adult epileptics with intracerebral electrodes. IES
relations were revealed by comparing the onset of the averaged IES in
each channel, with one being used alternatively as the triggering chan
nel. The records were analysed and sorted by comparing the morphology
of individual IES and the final average morphology. There was a domina
nt group of IES on each recording site channel representing about 65-8
0% and decidedly influencing the average morphology of all IES. The ma
jor limitation of IES averaging is the loss of information due to the
IES relative heterogeneity. Nevertheless, it reveals the main basic re
lationships in the large numbers of IES. On the other hand, IES averag
ing helps to minimize fortuitous spatiotemporal relations between reco
rding sites. The relationship between IES in two channels was consider
ed as significant only when these channels were observed both before a
nd after the mutual switching of the role of triggered and triggering
channel. The relations were then considered significant in only about
18% of all possible relations.