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March 1981

Acoustic Analysis: An Objective Measure of Affective Flattening

Author Affiliations

From the Department of Psychiatry, University of Iowa College of Medicine, Iowa City (Dr Andreasen); and the Department of Psychiatry, New York University, New York (Drs Alpert and Martz).

Arch Gen Psychiatry. 1981;38(3):281-285. doi:10.1001/archpsyc.1981.01780280049005

• Acoustic analysis of voice patterns is an objective means of evaluating flatness of affect. Thirty-one patients defined as having flat affect by a reliable rating scale were compared with 30 patients who were not flat. The hypothesis that flat patients display monotonic speech was confirmed, for these patients showed less variance in both the amplitude and frequency of their speech than the nonflat patients.

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