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An empirically oriented study of a pathological liar is described. It was hypothesized that such an individual might be characterized by a construct system that is atypically loose over a wide range of conventional, socially relevant constructs. Evidence consistent with this hypothesis
was obtained from the Thought Disorder Grid (TDG) and by a marked response bias on the Eysenck Personality Inventory (EPI). However, a conventional Repertory Grid (administered twice) yielded scores to indicate that construing was tight over a limited range of idiosyncratic, socially relevant
constructs. It was concluded that the individual's understanding of his social environment was generally unreliable and this might be a factor to account for the lying behavior.