Face masks facilitate discrimination of genuine and fake smiles – But people believe the opposite

It seems a foregone conclusion that face mask-wearing hinders the interpretation of facial expressions, increasing the risk of interpersonal miscommunication. This research identifies a notable counter-case to this apparent truism. In multiple experiments, perceivers were more accurate distinguishing between genuine and fake smiles when the mouth region was concealed under a mask versus exposed. Masks improved accuracy by shielding perceivers from the undue influence of non-diagnostic cues hidden behind masks. However, perceivers were unaware of the advantage bestowed by masks, holding, instead, the misbelief that masks severely obscure the distinction between genuine and fake smiles. Furthermore, these patterns proved to be culturally invariant rather than culturally contingent, holding true for both Westerners and Easterners.