title: Blocking mimicry makes true and false smiles look the same.
abstract: Recent research suggests that facial mimicry underlies accurate interpretation of subtle facial expressions. In three experiments, we manipulated mimicry and tested its role in judgments of the genuineness of true and false smiles. Experiment 1 used facial EMG to show that a new mouthguard technique for blocking mimicry modifies both the amount and the time course of facial reactions. In Experiments 2 and 3, participants rated true and false smiles either while wearing mouthguards or when allowed to freely mimic the smiles with or without additional distraction, namely holding a squeeze ball or wearing a finger-cuff heart rate monitor. Results showed that blocking mimicry compromised the decoding of true and false smiles such that they were judged as equally genuine. Together the experiments highlight the role of facial mimicry in judging subtle meanings of facial expressions.
authors.affiliation: Department of Psychology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America; Université Blaise Pascal, Clermont-Ferrand, France.
authors.forename: Magdalena
authors.initials: M
authors.lastname: Rychlowska
authors.affiliation: Institut de Psychologie du Travail et des Organisations, Université de Neuchâtel, Neuchâtel, Switzerland.
authors.forename: Elena
authors.initials: E
authors.lastname: Cañadas
authors.affiliation: Department of Psychology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.
authors.forename: Adrienne
authors.initials: A
authors.lastname: Wood
authors.affiliation: Division of Psychology and Language Sciences, University College London, London, United Kingdom.
authors.forename: Eva G
authors.initials: EG
authors.lastname: Krumhuber
authors.affiliation: Department of Psychology, University of Amsterdam, Amsterdam, the Netherlands.
authors.forename: Agneta
authors.initials: A
authors.lastname: Fischer
authors.affiliation: Department of Psychology, University of Wisconsin-Madison, Madison, Wisconsin, United States of America.
authors.forename: Paula M
authors.initials: PM
authors.lastname: Niedenthal
mesh_terms: D005149:Facial Expression; D005260:Female; D006801:Humans; D008297:Male; D012904:Smiling; D055815:Young Adult