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  • Title: Electrocortical frequencies in hyperactive, learning-disabled, mixed, and normal children.
    Author: Dykman RA, Holcomb PJ, Oglesby DM, Ackerman PT.
    Journal: Biol Psychiatry; 1982 Jun; 17(6):675-85. PubMed ID: 7104419.
    Abstract:
    Ten boys in each of four groups (hyperactive, learning-disabled, hyperactive/learning-disabled or mixed, and normal) were exposed to a complex visual search task. EEGs were recorded at central and parietal sites, 1-sec prestimulus and 1-sec poststimulus onset, on three types of trials. The resulting wave forms, averaged over trials, were converted to the frequency domain via a fast Fourier transform and factored by principal components. Four components accounting for 87% of the variance were varimax-rotated. Analyses of variance of the component scores revealed that Component 1 differentiated the four groups of boys. This component had highest loadings in frequencies from 16 to 20 Hz and secondary loading in frequencies from 7 to 10 Hz. It was concluded that this multifrequency component is sensitive to parameters deficient in hyperactive and learning-disabled children.
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