Developmental process of electroencephalogram by follow-up recording of normal and mentally retarded children's EEGs.

概要

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The present study aimed to investigate the relationship between the dominant and the subordinate components in the developing EEGs, and to propose a commonly available schema of the developmental process of EEG applicable for both normal and mentally retarded children. The EEGs were recorded longitudinally from 21 normal and 16 mentally retarded children. They were followed up after an interval varying from about one to four years. Regarding the longitudinal changes of peak components in the spectra of normal children, it was observed that an earlier subordinate component became dominant at the same frequency, and that this component showed thereafter decreased power and became a subordinate one which eventually disappeared. At the same time or in advance to the above, another peak component appeared at a higher frequency, and the dominant component of about 10 Hz appeared at last. While EEG frequencies of retarded subjects were lower than those of normal children in the same age, the course of changing showed similarity in the both groups. Therefore, the developmental changes of EEG can be schematically apprehended that it takes the course of stepwise heightening of the dominant frequency, and that each component undergoes the change of growing and diminishing so that the dominancy of the component alternates at different stages.
公益社団法人日本心理学会の論文