Trafimow D, Porter P P
Department of Psychology, New Mexico State University, Las Cruces 88003-8001, USA.
J Soc Psychol. 1997 Aug;137(4):412-20. doi: 10.1080/00224549709595456.
Information that is incongruent with a prior expectancy is remembered better than congruent information. Two explanations were investigated: (a) people attempt to explain incongruent information to understand it, and (b) people use incongruent information to update their expectancies. The common assumption in these two accounts is that the additional cognitive processing stimulated by incongruent information is responsible for the incongruity effect. In this study, U.S. students were explicitly requested to engage in one or the other of these processes. Although both processes resulted in an incongruity effect, there was a positive correlation between recall of expectancy-congruent and expectancy-incongruent items in the impression-updating condition but not in the other condition; those in the impression-updating condition showed greater expectancy change.
