title: Test-retest reliability of mismatch negativity for duration, frequency and intensity changes.
abstract: OBJECTIVE
  The test-retest reliabilities of the mismatch negativity (MMN) elicited by deviances in sound duration, frequency, and intensity were compared.
  
  
  METHODS
  The MMN was recorded with a 64-channel electroencephalograph (EEG) from 15 healthy adult subjects in two sessions over intervals of 1-27 days. During the recordings, subjects watched a silent movie while they were presented with one long stimulus sequence consisting of 6 types of tones. The standard tone (P = 0.8) of 75 ms in duration consisted of 3 lowest harmonic partials with 500 Hz as the fundamental frequency. Each of the 5 different deviant tones was presented with P = 0.04: frequency deviants (+/-5%, +/-10%), duration deviants (-66%, -33%), and intensity deviants (- 15 dB).
  
  
  RESULTS
  The 66% duration decrement elicited MMN with the most replicable amplitude (r = 0.78) and latency (r = 0.76) among the deviances tested.
  
  
  CONCLUSIONS
  Since these reliabilities considerably exceed those reported previously, these data support the use of the duration decrement deviance presented with spectrally rich tones while investigating the integrity of the patients' cognitive brain functions using the MMN.
authors.affiliation: Department of Psychology, University of Helsinki, Finland. tervanie@helsinki.fi
authors.forename: M
authors.initials: M
authors.lastname: Tervaniemi
authors.forename: A
authors.initials: A
authors.lastname: Lehtokoski
authors.forename: J
authors.initials: J
authors.lastname: Sinkkonen
authors.forename: J
authors.initials: J
authors.lastname: Virtanen
authors.forename: R J
authors.initials: RJ
authors.lastname: Ilmoniemi
authors.forename: R
authors.initials: R
authors.lastname: Näätänen
mesh_terms: D000161:Acoustic Stimulation; D000328:Adult; D001519:Behavior / Q000502:physiology; D004569:Electroencephalography; D005072:Evoked Potentials, Auditory / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D011930:Reaction Time / Q000502:physiology; D015203:Reproducibility of Results; D013997:Time Factors