title: Combined electroencephalography and magnetoencephalography of interictal spikes in benign rolandic epilepsy of childhood.
abstract: OBJECTIVE
  The neurogenesis and functional organization of the interictal spikes in benign rolandic epilepsy of childhood (BREC) still remains controversial.
  
  
  METHODS
  We performed a combined neuroelectric and neuromagnetic study in 24 consecutive patients with BREC using a 143-channel whole-head magnetoencephalography (MEG) system simultaneously with electroencephalography (EEG) recorded from 40 closely spaced scalp-EEG electrodes. Isopotential and isofield maps were calculated over the time window from 250ms before to 250ms after the maximum of the negative peak of the spike. We then performed principal component analysis (PCA) and spatio-temporal dipole modeling in order to estimate the number, location and temporal activity of sources.
  
  
  RESULTS
  EEG and MEG spikes were characterized by a stereotypical appearance both within and across patients showing a stable dipolar field distribution over the entire time window. The spikes were generated by a single tangential dipolar source located in the precentral gyrus with the positive pole directed frontally and the negative pole directed centro-temporally.
  
  
  CONCLUSIONS
  One source located in the precentral gyrus can adequately explain the spike complex in BREC.
  
  
  CONCLUSIONS
  Simultaneous EEG and MEG provide comprehensive information on functional organization of spikes in BREC.
authors.affiliation: Medical University of Vienna, Department of Neurology, Vienna, Austria. Electronic address: ekaterina.pataraia@meduniwien.ac.at.
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Pataraia
authors.affiliation: Medical University of Vienna, Department of Pediatrics, Vienna, Austria.
authors.forename: Martha
authors.initials: M
authors.lastname: Feucht
authors.affiliation: Medical University of Vienna, Department of Neurology, Vienna, Austria.
authors.forename: Gerald
authors.initials: G
authors.lastname: Lindinger
authors.affiliation: Medical University of Vienna, Department of Neurology, Vienna, Austria.
authors.forename: Susanne
authors.initials: S
authors.lastname: Aull-Watschinger
authors.affiliation: Medical University of Vienna, Department of Neurology, Vienna, Austria.
authors.forename: Christoph
authors.initials: C
authors.lastname: Baumgartner
mesh_terms: D000200:Action Potentials / Q000502:physiology*; D000293:Adolescent; D001931:Brain Mapping; D002648:Child; D004558:Electric Stimulation / Q000379:methods; D004569:Electroencephalography; D019305:Epilepsy, Rolandic / Q000503:physiopathology*; D005260:Female; D006801:Humans; D015225:Magnetoencephalography; D008297:Male; D025341:Principal Component Analysis