Physio-Psychological Study on the Development of Mentally Retarded Children by Electroencephalogram

Katada, Akiyoshi

doi:10.4992/jjpsy.44.59

Cited by 3 publications

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“…Further, another important aspect in the study of children's EEG evolution may be to examine not only the dominant component but also the subordinate components (Katada et al, 1981). We have confirmed that developmental processes of children's EEGs are characterized by the changes from low frequencies to high frequencies, and found that the frequency of the dominant component is heightened not continuously but stepwise with increasing age (Katada, 1973b). Since many studies reported that basic rhythms of EEGs of mentally retarded children without exogenous factors do not contain abnormal waves and show a certain developmental lag (Kajitani, 1963;Katada, 1973b), it might be necessary for the study of the mentally retarded children's EEGs how their EEGs show the common properties to the normal developmental process of EEGs.…”

supporting

confidence: 69%

“…Developmental alternation of dominant and subordinate components in the EEG power spectrum. In our previous studies, we identified the dominant and subordinate components among many components shown in the EEG power spectrum (Katada, 1973b;Katada et al, 1981). From these results, in subjects with the dominant component at a frequency lower than 7-8 Hz, subordinate ones were found at a higher frequency than 7-8 Hz.…”

Section: Developmental Schema Of Eeg and Its Availabilitymentioning

confidence: 93%

“…On the other hand, from the viewpoint that both a normal and a retarded child may take developmental changes in their brain activities, findings on the basic EEG rhythms and the chronologinal changes have to be regarded also as another important aspect. In this respect, many studies have indicated that in mentally retarded subjects occipital alpha rhythms did not appear continuously , and/or the dominancy of slow waves was evident (Kreezer & Smith, 1950), and that they showed theta waves more frcquently (Katada, 1973b), and had greater individual differences than normal children (Kajitani, 1963;Katada, 1973a). The aim of these studies often inclined toward distinguishing the abnormality or specificity of the mentally retarded child from the normal one.…”

Section: Patterning Relationship Between Dominant and Subordinate Commentioning

confidence: 99%

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

Katada

Koike

1990

Jpn. Psychol. Res

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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.

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supporting

confidence: 69%

Section: Developmental Schema Of Eeg and Its Availabilitymentioning

confidence: 93%

Section: Patterning Relationship Between Dominant and Subordinate Commentioning

confidence: 99%

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

Katada

Koike

1990

Jpn. Psychol. Res

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Developmental characteristics of normal and mentally retarded children's EEGs

Katada

Ozaki

Suzuki

et al. 1981

Electroencephalography and Clinical Neurophysiology

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Generators of theta and alpha waves in the development of human: EEGs included persons with mental retardation

明義¹

2012

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The research I have undertaken in the physiological psychology of mentally retarded children has been based on an analysis of their basic EEG rhythms. In the days when I began my research, the characteristics of the EEGs of mentally retarded children were identified as follows; (a) slowing of α wave (b) distinctive emergence of θ wave (c) emergence of irregular and unstable waves (d) noticeable individual differencesI studied normal and mentally retarded children's EEGs utilizing both cross-sectional studies and longitudinal studies, and suggested a schema of EEG development, which I presented both in Japan and abroad. While α waves frequency continuously increases as children grow up, this schema shows that there is a change in particular components and each of them has a generator which produces these particular components. Therefore I especially tried to clarify the differences of characteristics between θ and α waves. I suggested that the θ wave's generator is located much deeper in from the scalp than α wave's, because of the alternation of the EEG power. I also clarified the difference of both particular components in terms of the temporal correlation of their emergence, response to optical stimulus and the relation between their physical locations. I would suggest that all characteristics of mentally retarded children's EEGs are connected to the development of the EEG. In conclusion, I assume that α wave component has an inhibitive function in relation to components of low-frequency. (Japanese Journal of Physiological Psychology and Psychophysiology, 30(1) : 25-38, 2012.)

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Physio-Psychological Study on the Development of Mentally Retarded Children by Electroencephalogram

Cited by 3 publications

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

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

Developmental characteristics of normal and mentally retarded children's EEGs

Generators of theta and alpha waves in the development of human: EEGs included persons with mental retardation

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