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Collective behavior refers to the spontaneous actions of a group of people who are responding to the same event or stimuli. Crowds are a form of collective behavior that are concentrated in time and space, with participants often sharing a collaborative goal aimed at social change.12

There are two main types of crowds:
* Active crowds are aggressive and act directly upon an external object or group, often with a sense of power and impunity.2
* Expressive crowds focus on shared subjective experiences like dancing or singing, releasing accumulated tension through emotional expression rather than direct action.1

Theories explaining collective behavior range from early ideas of atavism and mental disorder to modern approaches emphasizing individual motivation, social disorganization, and the intensity of social interaction within groups.34

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