Figure 3. Dynamic Facial Expression Task.

A. Videos of 8 different durations ranging from 200ms to 1.6s depicting dynamic facial expressions of happiness, fear, and anger were used as stimuli. B. Depiction of the trial structure – each trial began with a 500ms fixation cross, followed by a happy, fearful, or angry video of varying duration (200ms, 400ms, 600ms, 800ms, 1s, 1.2s, 1.4s, or 1.6s), and a 1s response window during which participants were to indicate if they thought the video depicted a happy, fearful, angry, or neutral expression during the emotion task runs, or whether the mouth moved or not during the facial motion control task runs. C. Box and whisker plots showing the thresholds for each task for control participants in blue and MBS individuals in red. MBS individuals had higher thresholds than controls participants for both facial motion detection and emotion categorization tasks (**p < 0.001; *** p < 10⁻⁶). KDEF images used in Figure 3 panels A and B are reproduced from KDEF stimulus database - Lundqvist et al., 1998 (https://www.kdef.se/home/aboutKDEF.html), with permission from Karolinska Institutet, Psychology section, Copyright year: 1998, Copyright holder: Karolinska Institutet, Psychology section.