Wilson, T. D., &Schooler, J. W. (1991). Thinking too much: introspection can reduce the quality of preferences and decisions.Journal of personality and social psychology, 60(2), 181-192.
In Study 1, 49 college students' preferences for different brands of strawberry jams were compared with experts' ratings of the jams. Students who analyzed why they felt the way they did agreed less with the experts than students who did not. In Study 2, 243 college students' preferences for college courses were compared with expert opinion. Some students were asked to analyze reasons; others were ...