Document Detail

Electroencephalography artifacts in workplace alertness monitoring.
MedLine Citation:
PMID:  17460803     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: This study assessed the effect of removing artifacts from workplace electroencephalography (EEG) recordings on power spectra and the consequent interpretation of changes in alertness. METHODS: EEG was recorded for 27 air traffic controllers on the night shifts of four roster cycles. On two of the four night shifts, each controller was given a 40-minute opportunity to nap, while on the other two they remained awake (105 shifts in total). Recordings for the last hour of each night shift were screened for artifacts by an experienced viewer (who viewed the EEG in isolation from other electrophysiological recordings). The effects of the nap opportunity on the EEG power spectra were then analyzed in a mixed model analysis of variance in the presence and absence of artifact-contaminated data. RESULTS: Overall, 89.3% of the EEG recordings contained artifacts. Removal of these data markedly altered the interpretation of how the nap opportunities affected the EEG power spectra. The spectral parameters of the artifact appeared to be different when the participants were given the opportunity to nap. CONCLUSIONS: Removal of artifacts can dramatically affect the interpretation of workplace EEG recordings. This potential source of error is often unreported.
Jesse Gale; T Leigh Signal; Alexander L Garden; Philippa H Gander
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Scandinavian journal of work, environment & health     Volume:  33     ISSN:  0355-3140     ISO Abbreviation:  Scand J Work Environ Health     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-04-26     Completed Date:  2007-10-15     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7511540     Medline TA:  Scand J Work Environ Health     Country:  Finland    
Other Details:
Languages:  eng     Pagination:  148-52     Citation Subset:  IM    
Sleep/Wake Research Centre, Massey University, 102 Adelaide Road, Newtown, Wellington 6012, New Zealand.
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MeSH Terms
Analysis of Variance
Brain / physiology*
Middle Aged
Monitoring, Physiologic
New Zealand
Signal Processing, Computer-Assisted
Sleep / physiology
Work Schedule Tolerance / physiology*

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