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Article
July 1992

Thought Disorder Ratings Distinguish Between Diagnostic Groups

Author Affiliations

Department of Psychology University of Illinois at Urbana-Champaign 603 E Daniel St Champaign, IL 61820

Arch Gen Psychiatry. 1992;49(7):589-590. doi:10.1001/archpsyc.1992.01820070083020
Abstract

To the Editor.—  I1 recently proposed an alternative hypothesis to explain a discrepancy between the findings of Shenton et al2 and those reported by my colleagues and me.3 Shenton et al4 attempt to discredit the results of our study. They argue that we did a poor job of measuring formal thought disorder. To support their argument, they claim that "the thought disorder ratings done by Berenbaum et al did not even distinguish between the normal twin and the schizophrenic twin. Therefore, it is not surprising that, with the exception of verbosity, they did not find differences in thought disorder concordance between monozygotic and dizygotic twins." I agree with Shenton et al that the ability of a thought disorder instrument to distinguish between schizophrenic patients and normal subjects is a critical test of its validity. That is why, in our original article,3 "our first analysis was

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