Conflict detection and base-rate extremity.

People tend to ignore the probabilistic rules cued by the base-rate information and rely on the heuristic intuition cued by the descriptive information to make "stereotypical" responses in base-rate problems. Conflict detection studies have shown that reasoners can detect conflicts between heuristic intuition and probabilistic considerations despite ultimately stereotypical responses. However, these studies primarily used extreme base-rate tasks. A critical open question is the extent to which successful conflict detection relies on an extreme base rate. The present study explores this issue by manipulating the base-rate extremity of problems in which the descriptive information and the base-rate information conflict or not. As a result, when reasoners made stereotypical responses in the conflict version of the moderate base-rate task, they took longer to respond, had lower confidence in their responses, and were slower to evaluate their confidence than in the no-conflict version of the task. All three measures indicate that stereotypical reasoners can stably detect conflict in moderate base-rate tasks, which expands the scope of successful conflict detection. Moreover, our response confidence data found a larger detection effect size in the extreme base-rate condition than in the moderate base-rate condition. This suggests that conflict detection is more efficient as the base-rate extremity increases. Implications for the boundary conditions of conflict detection are discussed.