Interpreter bias on the Rorschach Test as a function of patients' socioeconomic status.

Summary Hypotheses investigated were: Rorschach interpretation would indicate more negative and pathological factors for patients with lower-class, than for patients with middle-class social histories; and experienced interpreters would be less biased than inexperienced ones. Groups of experts (Fellows of the Society for Projective Techniques) and novices (graduate students) rated the same protocols; a) blind, b) accompanied by a lower-class history, c) accompanied by a middle-class history, on 21 objective scales. Addition of social-class information significantly influences judgments in the predicted directions. Much of the effect was attributable to the novice Rorschachers but the experts were not entirely free of the biasing effect.