Document Detail

Life-span changes in EEG spectral amplitude, amplitude variability and mean frequency.
MedLine Citation:
PMID:  10454276     Owner:  NLM     Status:  MEDLINE    
OBJECTIVES: The objectives were to assess life-span alterations in intrasubject variability of EEG spectral amplitudes and in amplitude and mean frequency computed from spectral amplitude profiles. METHODS: EEG was recorded from the central and occipital scalp of 222 healthy males aged 4 to 90 years. Amplitude spectral profiles derived from FFT procedures provided data for the computation of amplitude variability (ampCV), absolute and relative amplitude and mean frequency for each of five spectral bands. Analysis of variance, coefficient of correlation and t test were employed in data analyses. RESULTS: The ampCV measure did not provide direct evidence of age-related intrasubject changes in EEG frequency but was useful for indexing the presence of rhythmic EEG activity. Marked decreases in absolute amplitude occurred during childhood with little change thereafter. Age changes in relative amplitude were more complex and differed for slow and fast EEG activity. We also report that an algorithm frequently used to estimate mean frequency can introduce consistent bias into mean frequency computations under some conditions. CONCLUSIONS: Life-span changes in measured EEG characteristics were generally consistent with those from earlier studies. It is important that investigators validate and describe procedures used to determine mean frequency of EEG spectral data.
R E Dustman; D E Shearer; R Y Emmerson
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology     Volume:  110     ISSN:  1388-2457     ISO Abbreviation:  Clin Neurophysiol     Publication Date:  1999 Aug 
Date Detail:
Created Date:  1999-10-06     Completed Date:  1999-10-06     Revised Date:  2008-09-10    
Medline Journal Info:
Nlm Unique ID:  100883319     Medline TA:  Clin Neurophysiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  1399-409     Citation Subset:  IM    
Veterans Affairs Medical Center, Salt Lake City, UT 84148, USA.
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MeSH Terms
Aged, 80 and over
Aging / physiology*
Brain / physiology*
Child, Preschool
Middle Aged
Models, Neurological

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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