Virtuous opinion change in structured groups

Bolger, Fergus and Rowe, Gene and Hamlin, Iain and Belton, Ian and Crawford, Megan and Sissons, Aileen and Taylor Browne Lūka, Courtney and Vasilichi, Alexandrina and Wright, George (2023) Virtuous opinion change in structured groups. Judgment and Decision Making, 18. e25. ISSN 1930-2975 (

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Although the individual has been the focus of most research into judgment and decision making (JDM), important decisions in the real world are often made collectively rather than individually, a tendency that has increased in recent times with the opportunities for easy information exchange through the internet. From this perspective, JDM research that factors-in this social context has increased generalizability and mundane realism relative to that which ignores it. We delineate a problem-space for research within which we locate protocols that are used to study or support collective JDM, identify a common research question posed by all of these protocols – “What are the factors leading to opinion change for the better (‘virtuous opinion change’) in individual JDM agents?”, and propose a modelling approach and research paradigm using structured groups (i.e., groups with some constraints on their interaction), for answering this question. This paradigm, based on that used in studies of judge-adviser systems, avoids the need for real interacting groups and their attendant logistical problems, lack of power, and poor experimental control. We report an experiment using our paradigm on the effects of group size and opinion diversity on judgmental forecasting performance to illustrate our approach. The study found a U-shaped effect of group size on the probability of opinion change, but no effect on the amount of virtuous opinion change. Implications of our approach for development of more externally valid empirical studies and theories of JDM, and for the design of structuredgroup techniques to support collective JDM, are discussed.


Bolger, Fergus, Rowe, Gene, Hamlin, Iain, Belton, Ian ORCID logoORCID:, Crawford, Megan, Sissons, Aileen, Taylor Browne Lūka, Courtney, Vasilichi, Alexandrina and Wright, George ORCID logoORCID:;