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Ratings of the hkableness of persons described by 2 adjectives showed consistent violations of additive and constant-weight averaging models The effect of either adjective varied directly with the Hkableness of the other adjective Monotonic rescaling could remove the interactions, raising the theoretical question of whether interactions were due to nonlineanty in the rating scale or to nonadditive integration of the information Four experiments illustrate new methods for distinguishing these interpretations The fit of the subtractive model for ratings of differences in hkableness between 2 adjectives supported the validity of the response scale, in addition, ratings of homogeneous combinations were linearly related to subtractive model scale values Judgments of differences in hkableness between pairs of hypothetical persons, each person described by 2 adjectives, were ordmally inconsistent with additive models, confirming the interpretation that the interactions are real and should not be scaled away Theoretical and methodological implications are discussed This research is concerned with how impressions of personality are formed.
Michael H. Birnbaum (Tue,) studied this question.