The Minnesota Multiphasic Personality Inventory (MMPI) and Wechsler Adult Intelligence Scale (WAIS) were administered to the host personality of 18 patients with multiple personality prior to therapy. The MMPI was readministered a mean of 39 mo. later. The MMPI appears to be a valuable aid in diagnosing multiple personality. Characteristic MMPI protocols include (1) high F and Sc scales, (2) technically invalid profiles, (3) numerous critical items, (4) critical items indicating dissociation, (5) a poly-symptomatic picture, (6) wide discrepancy between obvious and subtle scores, (7) lack of blatant psychosis, (8) and infrequently elevated Hs scales. Individuals with borderline to superior IQs may have multiple personality.
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