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New research finds that smiles can be used to both soothe or attack - at least, as far as the brain's stress pathways are concerned. 新研究发现，微笑既可用于安抚，也能产生伤害，至少对于大脑的应激通路确是如此。 The study, published by researchers from the University of Wisconsin-Madison and Bar-Ilan University, looked at the interaction between nonverbal feedback and the activity of the hypothalamic-pituitary-adrenal axis, our body's central stress response system. 威斯康星大学麦迪逊大学和巴伊兰大学的研究人员发表的这项研究，对非语言反馈与下丘脑-垂体-肾上腺轴，即我们身体的主要压力应对系统之间的互动进行了调查。 The authors report that individuals with higher heart-rate variability showed the widest range of responses to different smiles. 作者报告称，心率可变性大的人对不同笑容的反应差异性也更大。 | 
