104 Chapter 4 SUPPLEMENT S4.2 Details concerning the preparation of the video stimuli For the preparation of the video fragments, videos of adolescents and one of their parents were recorded during the lab visit. The videos had a minimal duration of 45 s and were recorded in front of a white wall. Adolescents and parents wore a black t-shirt during the recordings to avoid distraction due to their clothing. We asked them to look in the camera with a friendly, but neutral, facial expression and to imagine looking into the eyes of their parent/child. They were also instructed not to stare, but to gaze as natural as possible and blinking was allowed. The individuals featured as the male and female unfamiliar peer and adult were selected based on age (between 11-17 years for the unfamiliar child and between 45-55 years for the unfamiliar adults) and gender. Videos were recorded under similar circumstances as videos of adolescents and parents who participated in the study and written informed consent was taken to confirm their approval to use the videos in the task. All videos were presented twice in two separate runs (2 × 8 = 16 trials in total). During the first run, all targets were presented in a random order. For each target, adolescents were presented with two successive videos of the same target, but with gaze direction randomized (i.e., either starting with direct gaze or averted gaze, followed by the other direction). During the second run, the order of targets was randomized again, but the order of the presentation of the gaze direction was counterbalanced to the first run. The durations of the videos were based on a randomly chosen interval between 16-38 s from prerecorded videos of 45 s. The first and last 3s of each prerecorded video were discarded due to movement in the video recording. Stimuli of each condition were presented for a total duration of 54 s across two repeats, meaning that duration of a stimulus in a specific condition in run 2 was 54 s minus stimulus duration in run 1 with a minimum of 16 s (range: 16-38 s).
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