Whenever Doug practises the piano privately, he plays very well; however, when his parents or one of his sisters is listening to him, he always makes a few mistakes. According to Zajonc, this is an example of

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Zajonc's theory suggests that the presence of others increases arousal, which can enhance the performance of well-learned tasks but impair the performance of tasks that are not well-learned or complex. Doug playing well alone but making mistakes in front of others is an example of how arousal from an audience affects performance.

Whenever Doug Practises the Piano Privately, He Plays Very Well;