KembaraXtra – Psychology: Congruity Theory

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Definition

Congruity theory is a cognitive consistency theory of attitude change developed by Charles E. Osgood and Percy Tannenbaum in 1955. It proposes that when a person learns of an association or dissociation between a source and an attitude object, attitudes toward both elements shift toward a more psychologically consistent state.

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Structure and Quantitative Model

The theory represents attitudes on a semantic differential scale ranging from −3 to +3. For an associative assertion, such as a liked person endorsing a disliked idea, the two attitudes move toward one another. The less strongly held attitude changes proportionately more than the more strongly held attitude. For a dissociative assertion, such as a source rejecting an object, the two attitudes move farther apart.

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Role in Attitude Change

Congruity theory extends balance theory by providing a mathematical account of how much each attitude should change. The total psychological pressure toward consistency is distributed between the source and the object according to the strength of the initial evaluations. It therefore predicts not only the direction of change but also its relative magnitude.

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Research Significance and Limitations

Later versions of the theory included corrections for the tendency of attitudes toward the object to shift more than attitudes toward the source and for disbelief when the asserted relationship seems implausible. Although historically influential, the model simplifies real attitudes, which are often multidimensional, context-sensitive, and affected by identity, motivation, and source credibility.

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Summary

Congruity theory explains attitude change as movement toward cognitive consistency between a source and an attitude object. It provides a quantitative extension of balance theory. The less polarized attitude usually changes more. The theory remains important in the history of persuasion and attitude research.