Figure 4. Dynamic Body Expression Task.

A. Videos of 12 different durations ranging from 200ms to 2.4s depicting dynamic body 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, 1.6s, 1.8s, 2.0s, 2.2s, or 2.4s), 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 arms moved or not during the body motion control task runs. C. Graph showing the emotion thresholds for each task for control participants in blue and MBS individuals in red. MBS individuals had similar thresholds as control participants for body motion detection (control task) and for two of the three body emotion detection tasks (*p < 0.01; ns: no significant difference). Figure 4 panels A and B use reproduced images from the Action Database – Keefe et al., 2014, with permission from the authors (copyright year: 2014, copyright holder: Keefe et al.).