精神薄弱児の発達に関する生理心理学的研究 脳波のオートパワスペクトルによる検討

堅田 明義

doi:10.4992/jjpsy.44.186

PHYSIO-PSYCHOLOGICAL STUDY ON THE DEVELOPMENT OF MENTALLY RETARDED CHILDREN

AUTO-POWER SPECTRUM ANALYSIS OF ELECTROENCEPHALOGRAM

AKIYOSHI KATADA

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JOURNAL FREE ACCESS

1973 Volume 44 Issue 4 Pages 186-194

DOI https://doi.org/10.4992/jjpsy.44.186

[Correction] The Japanese Journal of Psychology Vol.45 No.1 (1974) pp.55-55

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Published: 1973 Received: July 10, 1973 Available on J-STAGE: July 16, 2010 Accepted: - Advance online publication: - Revised: -
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Date of correction: July 16, 2010 Reason for correction: - Correction: ABSTRACT Details: Wrong : The present paper aimed at making clear the developmental characteristics of the mentally retarded children's EEG by auto-power spectrum analysis.
The subjects were 36 of normal children, and 39 of mentally retarded children who were without any exogenous history, motor disorders and EEG abnormalities, especially of the proxysmal wave type. The ages ranged from 3 to 15 in the normal and from 7 to 18 in the mentally retarded.
EEG was led monopolarly from four regions along the middle line and bilateral temporal regions. EEG was recorded on paper chart and also stored on magnetic tapes which were recorded by pulse width modulation. At first, we analyzed the spontaneous waking EEG from the scalp by the band pass filter type EEG frequency analyzer basing on the reproduced magnetic tape records of EEG. Then we selected the data (3 minutes) out of the analyzed EEG data. Auto-power spectra of the selected EEG data were calculated by a general purpose digital computer for medical use with 8K words memory (MC-1). The analysis time was 10 seconds and the spectral resolution or frequency band-width was 1/3Hz.
The main results were as follows:
1. Changes of the dominant frequency component were related to the advancing of the age. The alpha rhythm of a frequency of 10Hz, which are found in many normal adults, became dominant in all leads with the increasing of the age. These findings were not so obvious in the mentally retarded children.
2. In both the normal and the retarded, the alpha frequency component appeared at first in then occipital region, then in the central region and lastly in the frontal region.
3. We observed a mixture of some subordinate components and a dominant one in the frontal and the central regions of the normal and the retarded, but found none of it in the occipital region of either group.
4. The age at which the mixture of some subordinate components and a dominant one was shown was between 6 and 11 years in the frontal region of the normal and between 4 and 8 in the central region of them, and was between 13 and 15 years in the frontal and the central regions of the retarded. Subordinate components of the occipital region were less than those of both the frontal and the central regions.
5. When a dominant component in the spectrum appeared at lower frequencies than 8Hz, subordinate components apperared at higher frequencies than 8Hz. On the contrary, when a dominant component appeared at higher frequencies than 8Hz, subordinate components were at lower frequencies than 8Hz. These results were observed both in the normal and the retarded.
6. These results may be taken to suggest a retardation in the development of the retarded's brain, but we found there were little differences in the processes of the development of the spontaneous waking EEG between the normal and the retarded.
7. We pointed out the importance of examining both the dominant and the subordinate components of EEG in the developmental study EEG.
Right : This research was concerned with the development of the mentally retarded children's EEG. The subjects used were 36 normal and 39 mentally retarded children. The ages ranged from 3 to 15 in the normal and from 7 to 18 in the retarded. EEG was recorded monopolarly from the frontal, the central, the parietal and the occipital regions along the middle line, and the bilateral temporal regions. The EEG was put to auto-power spectrum analysis by the general purpose digital computer. When a dominant component in the spectrum appeared at frequencies lower than 8 Hz, subordinate components were manifest at frequencies higher than 8 Hz. On the contrary, when a dominant component appeared at frequencies higher than 8 Hz, subordinate components appeared at lower frequencies. These results were observed both in the normal and retarded. It was pointed out that it is important to examine both the dominant and the subordinate frequency in the developmental study of EEG components of EEG by auto-power spectrum analysis.

Abstract

This research was concerned with the development of the mentally retarded children's EEG. The subjects used were 36 normal and 39 mentally retarded children. The ages ranged from 3 to 15 in the normal and from 7 to 18 in the retarded. EEG was recorded monopolarly from the frontal, the central, the parietal and the occipital regions along the middle line, and the bilateral temporal regions. The EEG was put to auto-power spectrum analysis by the general purpose digital computer. When a dominant component in the spectrum appeared at frequencies lower than 8 Hz, subordinate components were manifest at frequencies higher than 8 Hz. On the contrary, when a dominant component appeared at frequencies higher than 8 Hz, subordinate components appeared at lower frequencies. These results were observed both in the normal and retarded. It was pointed out that it is important to examine both the dominant and the subordinate frequency in the developmental study of EEG components of EEG by auto-power spectrum analysis.

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