Group Dynamics: Theory, Research, and Practice, Vol 29(4), Dec 2025, 199-214; doi:10.1037/gdn0000230
Objective: We investigate how utilization of advice from an advisor with an opposing view may affect accuracy and reduces bias. Method: In a lab experiment, decision makers, either in judge–advisor dyads (one decision maker with one advisor) or groups (two decision makers consulting with one advisor), forecast the outcome of an American football game after considering the opinions of either an ingroup (fan of same team as decision maker) or outgroup (fan of opposing team) advisor. Results: Utilization of outgroup advice reduced wishful thinking bias. Decision makers can improve their accuracy by taking the average of their forecast with that of the outgroup advisor. Previous research found that groups utilize advice less than individuals, but this study found no difference. Conclusions: An outgroup advisor with alternative perspectives can help the decision maker reduce wishful thinking bias and increase decision accuracy. (PsycInfo Database Record (c) 2025 APA, all rights reserved)