Perceptual differentiation among drug addicts: correlations with intelligence and MMPI scores

Examined the level of perceptual differentiation, as measured by Witkin's Embedded Figures Test, as well as the correlations between perceptual differentiation and scores on The Shipley Institute of Living Scale and MMPI scales for drug addicts. The sample of 42 polydrug-dependent persons was court mandated into inpatient treatment as a condition of probation, parole, or furlough. Analysis of variance showed that addicts, like alcoholics, were less perceptually differentiated than normals. Correlational and/or multivariate procedures yielded significant relationships between differentiation, verbal and abstraction abilities, likelihood of cognitive impairment, and MMPI scales F, 1, 2, 3, 4, 6, 7, 8 and 0.