Mathematical analysis of EEG signs of spreading epileptic activity

I. Szirmai, R. Vollmer, R. Lapins

Research output: Contribution to journalArticle


The acetylcholine induced epileptic activity extends itself over the cerebral cortex with a speed measured in mm/min. Before the attack passes into a new cortex area, a low, high frequency sinusoidal activity develops in this area, of which the frequency continuously slows down with increasing amplitude. The frequency reduction is connected with the synchronization and the slow extension process. Cross correlation measurements, as well as of coherence and phase spectrum of the activity of the neighbouring electrodes indicate that the primary discharges are predominant in comparison with the spasm potentials originating from an earlier activated cortex area. The size of the primary discharge zones is approximately 2 mm in diameter; the 8 to 11 Hz synchronized generator activity extends in rings over the more distant cortex areas where the diameter of the involved zones measured no less than 4 mm.

Original languageEnglish
Pages (from-to)58-67
Number of pages10
JournalIdeggyogyaszati szemle
Issue number2
Publication statusPublished - Jan 1 1979


ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology

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