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Subgroup Differences

John F. Greden, MD; Nancy Genero, PhD; H. Laurence Price, MS; Michael Feinberg, MD, PhD; Simon Levine, PhD

Arch Gen Psychiatry. 1986;43(3):269-274.

Abstract
• To study whether facial electromyographic (EMG) activity during affective imagery differed between normal subjects and depressive subtypes, we evaluated EMG responses in 29 normal controls, 37 endogenously depressed patients, and 26 nonendogenously depressed patients. Different imagery states produced more distinctive EMG patterns in normal controls than in depressed patients. Patients with endogenous depression had EMG levels that differentiated them from normal subjects and had significantly greater absolute values than the nonendogenous group in corrugator happy and corrugator sad imagery trials. Intensity of sad and happy imagery, age, and severity of depression did not systematically correlate with EMG activity among depressive subtypes.

Author Affiliations
From the Departments of Psychiatry (Drs Greden, Genero, and Feinberg and Mr Price) and Physical Medicine and Rehabilitation (Dr Levine), University of Michigan Medical Center, Ann Arbor.

Footnotes
Accepted for publication Oct 24, 1984.

Reprint requests to Department of Psychiatry, University of Michigan Medical Center, Ann Arbor, MI 48109 (Dr Greden).

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