Abstract
This study tests the derivation from Festinger's dissonance theory that in situations where disparity is perceived between a person's opinion and the opinion expressed by a communicator, cognitive dissonance will occur and the individual will attempt to reduce the dissonance by any means possible, one of them being changing his own attitude. Where perceived disparity is greater the attitude change produced will be greater. Using questionnaires with Australian high school students the two measures of opinion change used were consistent in supporting the hypothesis for each of the three dimensions studied.

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