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Have you ever wondered why certain pop songs just make you feel so good? 你可曾好奇过为什么某些流行歌曲会让你感觉这么愉快？ Researchers studying the question found that the right combination of uncertainty and surprise is what gives listeners the most pleasure. 研究人员发现，恰到好处地融合不确定和惊奇因素是让倾听者感到愉悦的原因。 The study, published in the journal Current Biology, involved an analysis of 80,000 chords in 745 pop songs from the US Billboard "Hot 100" chart between 1958 and 1991. 发表在《当代生物学》期刊上的这项研究分析了1958年到1991年间美国公告牌百强单曲榜上的745首流行歌曲中的8万组和弦。 The researchers -- from institutes in Germany, Norway, Denmark and the UK -- used a machine-learning model to quantify the level of uncertainty and surprise of these chords, and then asked 39 adult volunteers to rate how pleasurable they found each series of chords. 来自德国、挪威、丹麦和英国科研机构的研究人员用一种机器学习模型把这些和弦中的不确定和惊奇因素量化了，并请39名成年志愿者给每组和弦带来的愉悦程度打分。 | 
