title: Test-retest consistency of the event-related desynchronization/event-related synchronization of the 4-6, 6-8, 8-10 and 10-12 Hz frequency bands during a memory task.
abstract: OBJECTIVE
  The aim of this study was to determine the test-retest consistency of the event-related desynchronization/event-related synchronization (ERD/ERS) method during the performance of an auditory memory task.
  
  
  METHODS
  The EEG was recorded while 12 subjects performed an auditory memory task on two separate occasions (mean test-retest interval 9 days). Differences in the ERD/ERS responses between the first and second registrations were examined in 4 EEG frequency bands of interest: 4-6, 6-8, 8-10 and 10-12 Hz.
  
  
  RESULTS
  We observed significant differences in the ERD/ERS responses between the first and second registration in all studied frequency bands when examined as a function of time and experimental task. The test-retest reliability of the ERD/ERS values was highest in the theta frequency range (4-6 and 6-8 Hz), poorer in the 8-10 Hz and poorest in the 10-12 Hz alpha frequency range.
  
  
  CONCLUSIONS
  The test-retest effect was seen in the ERD/ERS responses of all studied frequency bands during an auditory memory task.
authors.affiliation: Laboratory of Computational Engineering, Helsinki University of Technology, PB 9400 02015, Espoo, Finland. krause@lce.hut.fi
authors.forename: C M
authors.initials: CM
authors.lastname: Krause
authors.forename: L
authors.initials: L
authors.lastname: Sillanmäki
authors.forename: A
authors.initials: A
authors.lastname: Häggqvist
authors.forename: R
authors.initials: R
authors.lastname: Heino
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D001307:Auditory Perception / Q000502:physiology; D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D004585:Electrooculography; D005071:Evoked Potentials / Q000502:physiology*; D005260:Female; D005387:Finland; D006801:Humans; D007802:Language; D008297:Male; D008568:Memory / Q000502:physiology*; D008570:Memory, Short-Term / Q000502:physiology; D011930:Reaction Time; D015203:Reproducibility of Results; D014831:Voice