According to Zajonc, social facilitation

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Zajonc's theory of social facilitation suggests that the mere presence of others can enhance performance on easy or well-learned tasks, but can impair performance on difficult or new tasks. This effect is thought to occur because the physical presence of others increases physiological arousal, which enhances the dominant response (the most likely response given the individual's level of skill or familiarity with the task). Therefore, social facilitation occurs due to the physical immediacy of others.

According to Zajonc, Social Facilitation