title: [Spectral analytical study on the developmental properties of EEG in children: variability of EEG in normal and mentally retarded children (author's transl)].
abstract: The present study aimed at clarifying the characteristics of variability of the resting arousal EEGs in normal and mentally retarded children. Their ages ranged from 3 to 15 years in 58 normal and from 7 to 18 in 63 retarded. The EEG was recorded monopolarly from six regions of the scalp. The data analysed by a multipurpose digital computer comprised auto-power spectra and a coefficient of variation of power at each frequency. The variability of power at peak within the theta frequency band in both groups of children showed a notably higher value as compared with other frequency bands in all regions. We discussed some of the problems of treating this variability of power as a general characteristic of theta waves or as a developmental one.
mesh_terms: D000293:Adolescent; D000513:Alpha Rhythm; D001921:Brain / Q000254:growth & development; D002648:Child; D002675:Child, Preschool; D004569:Electroencephalography; D006801:Humans; D008607:Intellectual Disability / Q000503:physiopathology*; D013826:Theta Rhythm