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. 2021 Jul 22;16(7):e0254623. doi: 10.1371/journal.pone.0254623

Fig 1. Protocol and results of the emotion recognition test.

Fig 1

(A) A representation of a trial. One image of four facial expressions (angry, sad, happy, or surprised) was presented, and the participant was asked to choose a facial expression from five options (angry, sad, happy, surprised, and neutral). The facial picture is illustrated in this paper. (B) The t-test revealed that the total emotion recognition score in the elderly group (EG) was lower than that of younger group (YG). (C) An RM-ANCOVA with years of education and MoCA scores as covariates showed that there was no main effect of facial expression or group, and no interaction. Asterisks indicate significant differences (p < 0.05). Error bars indicate the standard error of mean.