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Stimuli were taken from the NimStim set (Tottenham et al., 2009). We used the surprise (mouth open) stimuli for mouth opening and eyebrow raising actions, anger (mouth closed) stimuli for mouth closing and eyebrow lowering actions, and the neutral (mouth open) stimuli. Either top or bottom half of the stimuli were presented, with a fixation cross either between the eyes (upper face stimuli) or centred on the mouth (lower face stimuli).
