Being in a good mood decreases the brain's working memory, US researchers say.

“This explains why you might not be able to remember a phone number you get at a party when you are having a good time,” Elizabeth Martin, a doctoral student of psychology at the University of Missouri, says in a statement. “This research is the first to show that positive mood can negatively impact working memory storage capacity.”

The researchers gauged study participants’ mood before and after showing them a video clip - some saw a bit of a stand-up comedy routine, while others saw a video on how to install flooring.

Those who viewed the comedy routine were in significantly better moods after viewing the video, while the mood of flooring group had not changed. Both groups were then given a memory test.

The study, published in the journal Cognition and Emotion, found those who watched the comedy routine performed significantly worse on the task.

美国研究人员称，好心情可能会降低大脑的工作记忆(属程序性记忆、短时记忆，是一种短暂时刻的知觉)能力。

“这就能解释为什么明明在派对上玩得很开心，却记不住从派对上得到的电话号码，”密苏里大学心理学博士伊丽莎白马丁在一份报告中指出。“该研究说明，积极情绪有损于工作记忆容量。”

研究人员在受试者观看视频片段前后对其情绪进行了测量。其中一部分受试者所看的是轻松喜剧节目，另一些人所看的视频则关于如何铺地板。

那些看了喜剧的受试者观后情绪更佳，而“地板视频”受试者观前观后情绪并无波动。两组都接受了记忆测试。

此项刊登于《认知与情感》杂志的研究发现，观看了喜剧的受试者在记忆测试中表现明显差于另一组受试者。

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