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The Measurement of Its Changes

Stephen W. Hurt, PhD; Philip S. Holzman, PhD; John M. Davis, MD

Arch Gen Psychiatry. 1983;40(12):1281-1285.

Abstract
• We examined the usefulness of the Thought Disorder Index (TDI), an instrument for assessing 21 categories of thought disorder ranging from subtle to flagrant, in a group of schizophrenic patients treated with an antipsychotic drug. The TDI charted the changes in thought disorder and showed a high degree of congruence with other scales of thought disorder. Because it does not depend on the clinical interview for its data and because it yields sensitive information about thought slippage independently of symptom assessments, the TDI may be profitably employed in a variety of research contexts.

Author Affiliations
From the New York Hospital-Cornell Medical Center, Westchester Division, White Plains, NY (Dr Hurt); the Department of Psychology and Social Relations, Harvard University, Cambridge, Mass, and the Mailman Research Center, McClean Hospital, Belmont, Mass (Dr Holzman); and the Illinois State Psychiatric Institute, Chicago (Dr Davis).

Footnotes
Accepted for publication July 15, 1983.

Reprint requests to Department of Psychology and Social Relations, Harvard University, 33 Kirkland St, Cambridge, MA 02138 (Dr Holzman).

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