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Irving Lester Janis (May 26, 1918 – November 15, 1990) was an American research psychologist at Yale University and a professor emeritus at the University of California, Berkeley most famous for his theory of "groupthink", which described the systematic errors made by groups when making collective decisions.
The idea of a "group mind" or "mob behavior" was first put forward by 19th-century social psychologists Gabriel Tarde and Gustave Le Bon.Herd behavior in human societies has also been studied by Sigmund Freud and Wilfred Trotter, whose book Instincts of the Herd in Peace and War is a classic in the field of social psychology.
Groupthink is sometimes stated to occur (more broadly) within natural groups within the community, for example to explain the lifelong different mindsets of those with differing political views (such as "conservatism" and "liberalism" in the U.S. political context [7] or the purported benefits of team work vs. work conducted in solitude). [8]
That there was pluralistic ignorance has also been seen as a reason why far-right parties have been growing so fast in recent years. [28] Another consequence of pluralistic ignorance is groupthink. [10] [8] This refers to a situation where small, cohesive groups of intelligent individuals are led to make unintelligent decisions. [10]
In 2008 Fehr, Bernhard, and Rockenbach, in a study conducted on children, found that boys displayed in-group favoritism from ages 3–8, whereas girls did not display such tendencies. [33] The experiment involved usage of an "envy game", a modified version of the dictator game. A possible explanation posited by researchers relied on an ...
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Conformity or conformism is the act of matching attitudes, beliefs, and behaviors to group norms, politics or being like-minded. [1] Norms are implicit, specific rules, guidance shared by a group of individuals, that guide their interactions with others.
The bandwagon effect is a psychological phenomenon where people adopt certain behaviors, styles, or attitudes simply because others are doing so. [1] More specifically, it is a cognitive bias by which public opinion or behaviours can alter due to particular actions and beliefs rallying amongst the public. [2]