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Article   |    
Emmett L. Schott
Am J Psychiatry 1930;87:213-227.
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Division of Neuropsychiatry, Department of Medicine, Henry Ford Hospital, Detroit, Mich.

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To summarize—this study shows that the variability of mental ratings in adult neuropsychiatric cases is much greater than the variability found in normal school children, and is considerably greater than that found in the children used in this study. Part of this difference is probably due to the fact that most of the adults had mental disturbances of psychotic degree, while the disturbances in the children were of a different type—namely, behavior problems, and various mild neurotic manifestations. Of all the cases with organic diseases, causing physiological and mental deterioration, the variability was greatest in the adults and there were likewise more adults with organic as well as functional disturbances. This was further emphasized by the brief supplementary study of the 10 cases of general paresis. Age and level of I. Q. were not found to be important factors in variability in this series of cases. In the adult group the women varied more than the men while in the group of children the boys varied more than the girls. The extent of the variability in mental ratings is of much value to the psychiatrist in determining the progression toward normality or increased abnormality. When thought of in this light retests not only aid in judging the mental level, but become a type of barometer indicating the upward or downward trend of mental functioning.

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