An MMPI scale to separate brain-damaged from functional psychiatric patients in neuropsychiatric settings

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Abstract

Developed an empirical MMPI scale, the Psychiatric-Organic (P-O) scale, to separate brain-damaged from functional psychiatric patients. It consisted of 56 items, which significantly differentiated 40 organic (mean age, 48.3 yrs) and 60 functional patients (mean age, 40.0 yrs) in a psychiatric hospital. Upon cross-validation with 361 male patients under 60 yrs of age, it was found capable of separating organics from process and reactive schizophrenics, alcoholics, and neurotics, as well as patients with character disorders and affective psychoses. Additionally, it was found that by using the scale in combination with a traditional brain-damage test (the Benton Visual Retention Test), better discrimination could be achieved than was possible with either measure alone. The comparative probabilities of functional and organic diagnoses for various P-O scale ranges are presented. (16 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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