A researcher who tested the facial feedback hypothesis by synthesizing experiments that manipulated facial movement and measured reported emotion. His 2019 meta-analysis with Jeff T. Larsen and Heather C. Lench found a small average effect whose size varied across experimental conditions. It distinguishes a pooled effect from the reliability of any one facial manipulation.[ref]
A meta-analysis of the facial feedback literature by Nicholas A. Coles and others. 2019, abstract and moderator analyses, 138 studies
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