title: Remission of benign epilepsy with rolandic spikes: an EEG-based connectivity study at the onset of the disease and at remission.
abstract: OBJECTIVE
  The neuronal mechanisms of remission of epilepsy are not known. Based on the principles of the "network theory of epilepsy" we postulated the existence of abnormal cortico-cortical interactions at the onset of epilepsy (Hypothesis-1), and postulated that remission is associated with the decrease or disappearance of the abnormal quantitative EEG findings (Hypothesis-2).
  
  
  METHODS
  Four children with benign epilepsy with rolandic sharp waves (BERS) were investigated. 21-channel EEG was recorded at the onset of the disease (Setting No. 1) and in remission (Setting No. 2). Local EEG synchronization was estimated by LORETA (low resolution electromagnetic tomography). Remote EEG synchronization (intra-hemispheric, cortico-cortical EEG functional connectivity, EEGfC) was computed by the LSC (LORETA Source Correlation) method, among 23 regions of interest (ROI) in both hemispheres. Both local and remote EEG synchronization were evaluated in very narrow frequency bands of 1Hz bandwidth (VNB), from 1 to 25Hz.
  
  
  RESULTS
  Individual results were presented. Abnormal but topographically very dissimilar LORETA and LSC findings were found at the onset of the disease. The disappearance of the initial abnormalities was found in Setting No. 2. An unforeseen finding was the presence of abnormal EEGfC results in Setting No. 2.
  
  
  CONCLUSIONS
  The authors confirmed both hypotheses. The dissimilarity of the initial abnormalities is in accord with the network concept of epilepsy and the etiology of BERS. The disappearance of the initial abnormalities reflects "normalization" of network dynamics while the emergence of new EEGfC abnormalities is interpreted as "compensation".
  
  
  CONCLUSIONS
  EEG-based local and remote connectivity (EEGfC) are appropriate tools to describe network dynamics in the active state of BERS and in remission.
authors.affiliation: Kenézy Hospital Ltd., Department of Neurology, Bartók Béla út 3, 4031 Debrecen, Hungary.
authors.forename: B
authors.initials: B
authors.lastname: Clemens
authors.forename: S
authors.initials: S
authors.lastname: Puskás
authors.forename: M
authors.initials: M
authors.lastname: Besenyei
authors.forename: T
authors.initials: T
authors.lastname: Spisák
authors.forename: M
authors.initials: M
authors.lastname: Emri
authors.forename: I
authors.initials: I
authors.lastname: Fekete
mesh_terms: D000927:Anticonvulsants / Q000627:therapeutic use; D002648:Child; D004569:Electroencephalography; D019305:Epilepsy, Rolandic / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D009434:Neural Pathways / Q000502:physiology; D012075:Remission, Spontaneous; D012640:Seizures / Q000503:physiopathology
chemical_list: D000927:Anticonvulsants
keywords: BERS; EEG; EEG functional connectivity; EEGfC; Epilepsy; LORETA; LORETA Source Correlation; LSC; Network theory; Pearson correlation coefficient; R; ROI; Remission; VNB; benign epilepsy with rolandic sharp waves; low resolution electromagnetic tomography; region of interest; very narrow band