title: Case comparison of sleep features from ear-EEG and scalp-EEG.
abstract: BACKGROUND
  We investigate the potential usability of a novel in-the-ear electroencephalography recording device for sleep staging.
  
  
  METHODS
  In one healthy subject we compare simultaneous earelectroencephalography to standard scalp EEG visually and using power spectrograms. Hypnograms independently derived from the records are compared.
  
  
  RESULTS
  We find that alpha activity, K complexes, sleep spindles and slow wave sleep can be visually distinguished using earelectroencephalography. Spectral peaks are shared between the two records. Hypnograms are 90.9% similar.
  
  
  CONCLUSIONS
  The results indicate that ear-electroencephalography can be used for sleep staging.
authors.affiliation: Neurophysiology Center, Dept. of Neurology, Zealand University Hospital, Roskilde, Denmark.
authors.forename: I
authors.initials: I
authors.lastname: Zibrandtsen
authors.affiliation: Dept. of Eng., Aarhus University, Aarhus, Denmark.
authors.forename: P
authors.initials: P
authors.lastname: Kidmose
authors.affiliation: Dept. of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark.
authors.forename: M
authors.initials: M
authors.lastname: Otto
authors.affiliation: Neurophysiology Center, Dept. of Neurology, Zealand University Hospital, Roskilde, Denmark.
authors.forename: J
authors.initials: J
authors.lastname: Ibsen
authors.affiliation: Neurophysiology Center, Dept. of Neurology, Zealand University Hospital, Roskilde, Denmark.
authors.forename: T W
authors.initials: TW
authors.lastname: Kjaer
keywords: Ear-EEG; Electroencephalography; Long term monitoring; Personal device; Polysomnography; Sleep staging