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Normative Data for the Unquantified EEG: Examination of Adequacy for Neuropsychiatric Research

Received June 7, 2003; revised February 19, 2003; accepted May 15, 2003. From Yale University School of Medicine and VA-Connecticut Healthcare System, Department of Psychiatry, West Haven, Connecticut; the Dartmouth School of Medicine, Department of Neurology, Hanover, New Hampshire; Louisiana State University Medical Center, Shreveport, Louisiana. Address correspondence to Dr. Boutros, 950 Campbell Ave (116A) West Haven, CT 06516; nash.boutros{at}yale.edu (E-mail).

Visual inspection of the unquantified electroencephalogram (EEG) remains the sole technique to confidently detect epileptiform discharges. Usefulness of this procedure in psychiatric research is hampered by reported prevalence of abnormalities in normal adults ranging from 4% to 57.5%. In this study, we examined the criteria used in available literature for selecting healthy individuals. Medline, PsychInfo, and textbook chapters were the primary sources for data. Analysis was restricted to studies examining the visual inspection of the EEG in humans. Thirty-eight articles met search criteria. Seven criteria for choosing healthy comparison subjects were used as the bases for this review. The majority of studies met no criteria, one criterion or two criteria. We conclude that the boundaries for normal unquantified EEG are poorly defined.

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				B. P. Shelley, M. R. Trimble, and N. N. Boutros Electroencephalographic Cerebral Dysrhythmic Abnormalities in the Trinity of Nonepileptic General Population, Neuropsychiatric, and Neurobehavioral Disorders J Neuropsychiatry Clin Neurosci, February 1, 2008; 20(1): 7 - 22. [Abstract] [Full Text] [PDF]

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