Many enjoy the mental stimulation of a challenging job.

很多人喜欢富有挑战性的工作所带来的强烈的精神刺激。

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Eventually, however, rather than continued mental stimulation, we begin to experience fatigue.

我们最终感受到的疲劳而不是持续的精神刺激。

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Results All patients had previous experience of mental stimulation and abnormal behaviors.

结果病人均有精神刺激、行为异常的先兆性；

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Nourishing the mind through reading, writing and other mental stimulation keeps one mentally fit.

FORBES: The 7th Habit

Many also want to carry on working beyond the standard retirement age for the mental stimulation (try that on the next bored-looking 20-year-old you meet in the lift).

ECONOMIST: Older workers