Effects of forewarning and afterwarning on persuasion

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  • 説得に及ぼす事前警告と事後警告の効果
  • セットク ニ オヨボス ジゼン ケイコク ト ジゴ ケイコク ノ コウカ

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Abstract

The present study was designed to investigate the effects of forewarning and afterwarning of the persuasive and fear-arousing intents of a communicator on persuasion. Two independent variables were manipulated: forewarning conditions (forewarning and no-forewarning) and afterwarning conditions (afterwarning and no-afterwarning). Two hundred and twenty five female college students were randomly assigned to one of the four experimental groups and one control group. Experimental groups were exposured to warning manipulation before and after reading a persuasive message, and then they were asked to respond to questionnaires. Results indicated the following. Forewarning inhibited affective attitude change toward the advocated position, and increased counterargumentation and derogation of both the message and its source. It was suggested that resistance to persuasion produced by forewarning might be mediated by counterargumentation and derogation of a message and its source. Afterwarning, however, facilitated cognitive attitude change toward the advocated position. This persuasion facilitating effect of afterwarning was discussed from the point of view of the cognitive dissonance theory.

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