The MPI and the EPI have been given together to 107 depressive patients at the time of their admission to hospital and again on discharge. These two questionnaires measure Neuroticism and Extraversion in a very similar way, but the similarity appears greater for Neuroticism than for Extraversion. On the EPI the mean Lie score for this group of patients is just over 4; the Lie score is inversely related to the N score, but bears no relation to the E score. The N and the E scales of the EPI are practically independent of each other.