The group polarization phenomenon.

@article{Myers1976TheGP,
  title={The group polarization phenomenon.},
  author={D. Myers and H. Lamm},
  journal={Psychological Bulletin},
  year={1976},
  volume={83},
  pages={602-627}
}
Experiments exploring the effects of group discussion on attitudes, jury decisions, ethical decisions, judgments, person perceptions, negotiations, and risk taking (other than the choice-dilemmas task) are generally consistent with a "group polarization" hypothesis, derived from the risky-shift literature. Recent attempts to explain the phenomenon fall mostly into one of three theoretical approaches: (a) group decision rules, especially majority rule (which is contradicted by available data… Expand
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