EEG was taken on 50 children comprising from the first to the fifth grades of primary school and relationships between EEG and autonomic nervous tension, character, intelligence level and school record were studied.
Following are the results of the study:
1) The age relationship.
In the occipital area the average d-index is 38.4-o in 7-year-old children (first grade), 31.4% in the 8-year-old (secoid grade), 25.7% in 9-year-old (third grade), 15.9% in the 10-year-old (fourth grade), and 18.5% in the 11-year-old children (fifth grade).
The decrease cf the d-index with advancing age is most marked in the slower waves. At age of 10 years (fourth grade) the cl-index becomes constant and reaches to the adult level.
The average frequency of EEG increases with age and reaches to the adult level at this age.
However, in the frontal area, the cl-index is found to be generally higher and its decrease with age is not so obvious as in the occipital area.
On the basis of above findings one has to be mindful of the age factor in interpreting pathological EEG.
2) The relationship with an autonomic nervous tension.
No significant correlation was found between EEG and results of autonomic nervous tension test which was carried out on respiration, pulse and psychogalvanic skin reflex by polygraphic method.
3) The relationship with the character of the children.
No correlation was noted between the degree of the nervosity and the average frequency, δ-index and β-index of EEG.
4) The relationship with intelligence level.
No significant correlation was discernible between EEG and intelligence level and the school record.
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