The psychological phenomenon in which an individual loses self-awareness and self-restraint due to the anonymity and arousal of being in a group is known as __________.

Deindividuation occurs when people in a group feel less individually identifiable and lose some self-awareness and self-restraint, often because of anonymity and heightened arousal. Therefore, the correct choice is deindividuation; groupthink instead describes pressure to maintain agreement within a group.

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