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Herd mentality, mob mentality and pack mentality, also lesser known as gang mentality, describes how people can be influenced by their peers to adopt certain behaviors on a largely emotional, rather than rational, basis. When individuals are affected by mob mentality, they may make different decisions than they would have individually.
The idea of a "group mind" or "mob behavior" was first put forward by 19th-century French 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. Sociologist and economist Thorstein Veblen's The Theory of the Leisure Class illustrates how individuals imitate other group members of higher social status in their consumer behavior. More recently, Malcolm Gladwell in The Tipping Point, examines how cultural, social, and economic factors converge to create trends in consumer behavior. In 2004, the New Yorker's financial columnist James Suroweicki published The Wisdom of Crowds.
Twenty-first-century academic fields such as marketing and behavioral finance attempt to identify and predict the rational and irrational behavior of investors. (See the work of Daniel Kahneman, Robert Shiller, Vernon L. Smith, and Amos Tversky.) Driven by emotional reactions such as greed and fear, investors can be seen to join in frantic purchasing and sales of stocks, creating bubbles and crashes. As a result, herd behavior is closely studied by behavioral finance experts in order to help predict future economic crises.
The Asch conformity experiments (1951) involved a series of studies directed by American Psychologist Solomon Asch that measured the effects of majority group belief and opinion on individuals. 50 male students from Swarthmore College participated in a vision test with a line judgement task. A naive participant was put in a room with seven confederates (i.e. actors) who had agreed in advance to match their responses. The participant was not aware of this, and was told the actors were also naive participants. There was one control condition with no confederates. Confederates purposefully gave the wrong answer on 12 trials. Through 18 trials total, Asch (1951) found that one-third (32%) of naive participants conformed with the clearly incorrect majority, with 75% of participants over the 12 trials. Less than 1% of participants gave the wrong answer when there were no confederates.
Researchers at Leeds University performed a group experiment where volunteers were told to randomly walk around a large hall without talking to each other. A select few were then given more detailed instructions on where to walk. The scientists discovered that people end up blindly following one or two instructed people who appear to know where they’re going. The results of this experiments showed that it only takes 5% of confident looking and instructed people to influence the direction of the 95% of people in the crowd and the 200 volunteers did this without even realizing it.
Researchers from Hebrew University, NYU, and MIT explored herd mentality in online spaces, specifically in the context of "digitized, aggregated opinions."  Online comments were given an initial positive or negative vote (up or down) on an undisclosed website over five months. The control group comments were left alone. The researchers found that "the first person reading the comment was 32 percent more likely to give it an up vote if it had been already given a fake positive score."  Over the five months, comments artificially rated positively showed a 25% higher average score than the control group, with the initial negative vote ending up with no statistical significance in comparison to the control group. The researchers found that "prior ratings created significant bias in individual rating behavior, and positive and negative social influences created asymmetric herding effects."
“That is a significant change,” Dr. Aral, one of the researchers involved in the experiment, stated. “We saw how these very small signals of social influence snowballed into behaviors like herding.”
- Argumentum ad populum
- Bandwagon effect
- Collective intelligence
- Critical mass (sociodynamics)
- Crowd abuse
- Crowd psychology
- Decentralized decision making
- Delphi method
- Early adopter
- Herd behavior
- Information cascade
- Monkey see, monkey do
- Opinion leadership
- Peer pressure
- Predictive market
- Religious paranoia
- Social network
- The Wisdom of Crowds
- Trial by media
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- "Sheep in human clothing - scientists reveal our flock mentality". University of Leeds Press Office. 14 February 2008.
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- Chang, Kenneth (2013-08-08). "'Like' This Article Online? Your Friends Will Probably Approve, Too, Scientists Say". The New York Times. ISSN 0362-4331. Retrieved 2019-02-06.
- Bloom, Howard, The Global Brain: The Evolution of Mass Mind from the Big Bang to the 21st Century. (2000) John Wiley & Sons, New York.
- Freud, Sigmund's Massenpsychologie und Ich-Analyse (1921; English translation Group Psychology and the Analysis of the Ego, *1922). Reprinted 1959 Liveright, New York.
- Gladwell, Malcolm, The Tipping Point: How Little Things Can Make a Big Difference. (2002) Little, Brown & Co., Boston.
- Le Bon, Gustav, Les Lois psychologiques de l'évolution des peuples. (1894) National Library of France, Paris.
- Le Bon, Gustave, The Crowd: A Study of the Popular Mind. (1895) Project Gutenberg.
- Martin, Everett Dean, The Behavior of Crowds (1920).
- McPhail, Clark. The Myth of the Madding Crowd (1991) Aldine-DeGruyter.
- Trotter, Wilfred, Instincts of the Herd in Peace and War. (1915) Macmillan, New York.
- Suroweicki, James: The Wisdom of Crowds: Why the Many Are Smarter Than the Few and How Collective Wisdom Shapes Business, Economies, *Societies and Nations. (2004) Little, Brown, Boston.
- Sunstein, Cass, Infotopia: How Many Minds Produce Knowledge. (2006) Oxford University Press, Oxford, United Kingdom.
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