A series of classic studies by psychologist Harry Harlow in the 1950s showed the importance of arousal as a motivator. In one of those studies, monkeys kept in a boring cage "worked" for the opportunity to watch an electric train run.

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This is true. Harry Harlow's classic studies demonstrated that stimuli such as visual or auditory stimulation can serve as strong motivators for animals in otherwise unstimulating environments.

A Series of Classic Studies by Psychologist Harry Harlow in the 1950s