Personality correlates of intelligence in a clinical group

The relationship between personality and intelligence test performance among 84 psychiatric patients was examined using a reduced version of the Wechsler Adult Intelligence Scale together with the Eysenck Personality Questionnaire. Introverts were inclined to do better than extraverts on all WAIS scales, the difference being statistically significant for the verbal subtests of Information and Similarities only. A 2-way multivariate analysis of variance gave a significant main effect for Social Conformity, in which low Lie scorers obtained higher scores on all subscales, particularly Verbal IQ. There was no main effect for Psychoticism but there were two interactions (Psychoticism x Lie) for the verbal subscales. For individuals characterized by high social conformity, the high Psychoticism scorers displayed lower scores on those scales associated with sensory associative intelligence (Information, Similarities, and Picture Completion). The results were discussed with particular reference to two competing theories relating personality and intelligence.