Personality and performance on a missing-letter measure of perceptual defence

Fifty-two Ss were required to make complete words from 20 neutral and 20 unpleasant ‘target’ words whose alternate letters had been removed. The four personality scales from the EPQ and the Psychoticism scale from the unpublished PEN inventory were employed as independent variables in repeated-measures analyses of variance in which the dependent variable was the number of neutral or bad target words produced in the missing-letter task. A significant two-way interaction was obtained between PEN Psychoticism and performance on the task, such that Ss scoring low on the personality scale hit significantly more neutral targets than Ss scoring high on the scale. These results did not support previous studies on the relationship between personality and perceptual defence and were interpreted within the framework provided by Mednick, whereby schizophrenia is characterized by a flattening of associative hierarchies.