Matching the message source to attitude functions: Implications for biased processing

A study was conducted to examine the hypothesis that matching (vs. mismatching) the source of a persuasive message to the functional basis of recipients' attitudes may lead to positively biased processing. Under conditions conducive to effortful processing, high and low self-monitors were presented with a persuasive message ascribed to a source that either matched or mismatched the functional basis of their attitudes (i.e., an expert source for low self-monitors and an attractive source for high self-monitors). The message content was either unambiguous strong, unambiguous weak, or ambiguous. As predicted, given an ambiguous message biased processing led to more agreement when the source matched (vs. mismatched) attitude functions. In contrast, an unambiguous strong message led to more agreement than an unambiguous weak message regardless of source matching (unbiased processing). Results are discussed with respect to the role of the activation and use of heuristics in biased processing.