Hastie et al.(1983)showed participants reenactments of an actual murder case and asked them to deliberate until they agreed on a verdict.After deliberation,their initial leanings:

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Hastie et al. (1983) found that after group deliberation, participants' initial leanings towards a verdict in a reenacted murder case had grown stronger. This phenomenon is consistent with the concept of group polarization, where discussion within a like-minded group tends to make the average opinion of group members more extreme.

Hastie Et Al