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Age and sex effects in the EEG: development of the normal child
A R Clarke1, R J Barry, R McCarthy
1Department of Psychology, University of Wollongong, Northfields Avenue, NSW 2522, Wollongong, Australia.
Insights
Childhood EEG analysis reveals developmental changes in brain activity with age. Males show distinct patterns compared to females, indicating earlier maturation at the midline.
Area of Science:
- Neuroscience
- Developmental Neuroscience
- Electroencephalography (EEG)
Background:
- Understanding age-related brain development is crucial for identifying neurological maturation.
- Sex differences in cognitive and neural development warrant investigation.
Purpose of the Study:
- To examine age-related changes in electroencephalogram (EEG) patterns in children.
- To identify sex-specific differences in EEG activity during childhood.
Main Methods:
- Recorded resting-state EEG in 80 children (40 boys, 40 girls) aged 8-12 years.
- Analyzed EEG data using Fourier transformation for power spectral analysis across delta, theta, alpha, and beta bands.
- Calculated absolute and relative power, and theta/alpha and theta/beta ratios.
Main Results:
- EEG showed a developmental reduction in slow-wave activity (delta, theta) with age.
- Increased alpha and beta activity correlated with increasing age, indicating maturation.
- Maturation rates differed between midline and hemispheric regions; males exhibited less theta and more alpha than females.
Conclusions:
- Brain maturation, as reflected in EEG, occurs earlier at the midline compared to the hemispheres.
- Females demonstrated a developmental lag in EEG maturation relative to males.
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.