Fig. 1
From: Smiling makes you look older, even when you wear a mask: the effect of face masks on age perception
Sample of the stimuli used in Experiments 1 and 2. a Unmasked neutral and smiling faces of young adults, middle-aged adults, and old adults. b Masked versions of the same faces. The unmasked faces were adapted from Ebner, N. C., Riediger, M., & Lindenberger, U. (2010). FACES—A database of facial expressions in young, middle-aged, and older women and men: Development and validation. Behavior Research Methods, 42, 351–362. https://doi.org/10.3758/BRM.42.1.351, all rights reserved