decrease performance on tasks that entail new learning or involve novel or difficult activities. What tasks people have mastered varies depending on the person. But generally, simple repetitive motions such as those involved in assembly-line work benefit from the social facilitation effect, while tasks entailing complex intellectual work, such as analyzing complex and multifaceted information to make a decision, are harmed. The negative effect of observers on performance that is not completely routinized through repeated practice is why actors and other performers do so much rehearsing before
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