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Age and sex effects in the EEG: Development of the normal child

Journal Article


Abstract


  • Objectives: This study investigated age-related changes and sex differences in the EEGs of normal children. Methods: Forty boys and 40 girls, between the ages of 8 and 12 years, participated in this study. The EEG was recorded during an eyes-closed resting condition and Fourier transformed to provide estimates for total power, absolute and relative power in the delta, theta, alpha and beta bands, and for theta/alpha and theta/beta ratios. Results: Absolute delta activity decreased with age. Relative delta and theta decreased and alpha and beta increased with increasing age. The theta/alpha and theta/beta ratios decreased with increasing age. All of these indicated a developmental reduction in slow wave activity. Maturational differences were found in the rates of change between the midline and the two hemispheres. In the absolute delta and the theta/beta ratio, the midline and the two hemispheres became more equipotential with age. In the beta band, power increased at a greater rate than in the two hemispheres. Sex differences were found, with males having less theta and more alpha than females. Conclusions: These results indicated that maturation occurs earlier at the midline than in the two hemispheres. Females were also found to have a developmental lag in the EEG compared with males. © 2001 Elsevier Science Ireland Ltd.

Publication Date


  • 2001

Citation


  • Clarke, A. R., Barry, R. J., McCarthy, R., & Selikowitz, M. (2001). Age and sex effects in the EEG: Development of the normal child. Clinical Neurophysiology, 112(5), 806-814. doi:10.1016/S1388-2457(01)00488-6

Scopus Eid


  • 2-s2.0-0035043410

Start Page


  • 806

End Page


  • 814

Volume


  • 112

Issue


  • 5

Abstract


  • Objectives: This study investigated age-related changes and sex differences in the EEGs of normal children. Methods: Forty boys and 40 girls, between the ages of 8 and 12 years, participated in this study. The EEG was recorded during an eyes-closed resting condition and Fourier transformed to provide estimates for total power, absolute and relative power in the delta, theta, alpha and beta bands, and for theta/alpha and theta/beta ratios. Results: Absolute delta activity decreased with age. Relative delta and theta decreased and alpha and beta increased with increasing age. The theta/alpha and theta/beta ratios decreased with increasing age. All of these indicated a developmental reduction in slow wave activity. Maturational differences were found in the rates of change between the midline and the two hemispheres. In the absolute delta and the theta/beta ratio, the midline and the two hemispheres became more equipotential with age. In the beta band, power increased at a greater rate than in the two hemispheres. Sex differences were found, with males having less theta and more alpha than females. Conclusions: These results indicated that maturation occurs earlier at the midline than in the two hemispheres. Females were also found to have a developmental lag in the EEG compared with males. © 2001 Elsevier Science Ireland Ltd.

Publication Date


  • 2001

Citation


  • Clarke, A. R., Barry, R. J., McCarthy, R., & Selikowitz, M. (2001). Age and sex effects in the EEG: Development of the normal child. Clinical Neurophysiology, 112(5), 806-814. doi:10.1016/S1388-2457(01)00488-6

Scopus Eid


  • 2-s2.0-0035043410

Start Page


  • 806

End Page


  • 814

Volume


  • 112

Issue


  • 5