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内容简介
讲了什么？
罗伯特·埃蒙斯与迈克尔·麦卡洛2003年的三项实验催生了一个流行神话：每晚写三件感恩的事，几周内你就会更快乐。二十年后，涵盖28国、24804人的元分析给出了真实答案：效应量Hedges g = 0.19，统计显著但极小。数字缩小的原因本身就是一堂科学课：当对照组从"什么都不做"变成"做另一种练习"，差异几乎归零。这不是失败，而是测量方法的进步。
你将了解：
- 对照组类型如何让效应从d=0.31降至接近零
- 34国10696人实验中为何"列出五件事"效果最弱
- 降低频率与聚焦"谁和为什么"如何延缓饱和感
