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Experimental Design. During fMRI scanning, participants judged the valence of 30 positive and 30 negative social scenes and 30 non-social control scenes. At the beginning of each run an instruction screen delivered the question to be answered in this run (either ‘scene pleasant?’ or ‘scene unpleasant?’) Each run consisted of 5 stimuli from each category (positive, negative, control) with half of the runs using unambiguous and half ambiguous stimuli.
