Psychologist dr . robert sinclair and his former phd student carrie lavis recently conducted a series of four studies addressing the effects of experimentally induced happiness versus sadness on work productivity by asking the participants to build circuit boards 最近进行了一系列研究，用实验方法诱导参与者心情愉快或悲观忧愁，要他们制作电路板，最后了解其对工作效率的影响。
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In similar studies sinclair and lavis found the same results along with evidence that happy people might not devote as much energy to the task in order to maintain their happy moods - they perceived that task as something that might detract from their present feelings 在同类研究中，他们也发现同样结果，当人们认为工作会带来愉快心情时，这些人便全身心投入到工作中去。证明心境愉快的人并不能保持良好愉快心境以充沛精力投入工作，因为他们认为工作会降低愉快心境。
