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The American Journal of Psychiatry, VOL. 126, No. 11

Articles | May 01, 1970

A Classificatory Principle in Schizophrenia

ROBERT CANCRO

Am J Psychiatry 1970;126:1655-1659.

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Visiting associate, the Center for Advanced Study, 912 W. Illinois, Urbana, Ill. 61801

1970, American Psychiatric Association

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Abstract

In an attempt to develop reliable criteria for symptoms unique to the schizophrenic syndromes, the author offers an Index of Formal Signs of thought disorder. Using the theory that language normally shows differentiation over time, he measures the form rather than the content of thought. The index was shown to be reliable when its ratings were compared with other clinical ratings.

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