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In the position of the second slide above, images were randomized across 80 trials, in which 4 expressions (Happy, Sad, Angry, Neutral) from 10 female and 10 male actors from the NimStim set [41] were each presented one time. The same mask (third slide above) was presented on each trial and was matched on luminance and low-level visual salience components to the face stimuli.
