title: Magnetoencephalography correlate of EEG POSTS (positive occipital sharp transients of sleep).
abstract: OBJECTIVE
  In contrast to EEG, which has guidelines for interpretation and a plethora of textbooks, the full range of activity seen in magnetoencephalography (MEG) has not been fleshed out. Currently, magnetoencephalographers apply criteria for EEG waveforms to MEG signals based on an assumption that MEG activity should have morphology that is similar to EEG. The purpose of this article was to show the characteristic MEG profile of positive occipital sharp transients of sleep.
  
  
  METHODS
  Simultaneous MEG-EEG recordings of two cases are shown.
  
  
  RESULTS
  In both the cases, the morphologic features of positive occipital sharp transients of sleep in MEG vary and sometimes mimic epileptic spikes.
  
  
  CONCLUSIONS
  This report raises a caution that a normal variant may have an even more epileptic appearance on MEG than on EEG. Using the simultaneously recorded EEG to avoid misinterpretation of spikey-looking positive occipital sharp transients of sleep in MEG is a natural and prudent practice.
authors.affiliation: Epilepsy Center, Department of Neurology, The Cleveland Clinic, Cleveland, OH 44195, USA.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kakisaka
authors.forename: Zhong I
authors.initials: ZI
authors.lastname: Wang
authors.forename: Rei
authors.initials: R
authors.lastname: Enatsu
authors.forename: Anne-Sophie
authors.initials: AS
authors.lastname: Dubarry
authors.forename: John C
authors.initials: JC
authors.lastname: Mosher
authors.forename: Andreas V
authors.initials: AV
authors.lastname: Alexopoulos
authors.forename: Richard C
authors.initials: RC
authors.lastname: Burgess
mesh_terms: D000328:Adult; D001931:Brain Mapping / Q000379:methods*; D003937:Diagnosis, Differential; D004569:Electroencephalography / Q000379:methods*; D004827:Epilepsy / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D006624:Hippocampus / Q000473:pathology / Q000503:physiopathology; D006801:Humans; D015225:Magnetoencephalography / Q000379:methods*; D008297:Male; D009778:Occipital Lobe / Q000503:physiopathology; D020919:Sleep Disorders, Intrinsic / Q000175:diagnosis* / Q000209:etiology* / Q000503:physiopathology; D012894:Sleep Stages; D013223:Statistics as Topic; D055815:Young Adult