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This presents a careful and exhaustive study of the intellect in cases of schizophrenia. (The authors continue to use the old terminology and refer to "dementia praecox.") Not only are the intelligence tests carefully presented with separate chapters dealing with general intelligence, patterns of mental functioning in dementia praecox, and the concept of deterioration, but all of the relevant literature referring to this subject has been exhaustively reviewed and quoted when useful. However, the study is of little if any practical value. The authors reach the same conclusion that every progressive psychiatrist who has studied or worked with the schizophrenic has inevitably recognized and that is, to quote from the manuscript, "Despite the great weight of opinion, going back to Kraepelin's own statement that mental efficiency is always diminished to a considerable extent in dementia praecox, we have not found evidence of intellectual deterioration in our patients.... While, as pointed
Psychological Studies in Dementia Praecox. JAMA. 1940;115(8):639. doi:10.1001/jama.1940.02810340067035
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