Figure 1
Schematic diagram of the social recognition matching task. The task was divided into eight blocks, four blocks of matching faces with fearful and angry facial expressions, from the NimStim Face Stimulus Set (http://www.macbrain.org/resources.htm), and four blocks of matching scene orientation, from the International Affective Picture System (http://csea.phhp.ufl.edu/media/iapsmessage.html), as a non-social control condition. Two of the four matching blocks of faces and scenes used repeatedly previously seen (‘familiar’) stimuli, whereas in other blocks, never before seen (‘unfamiliar’) stimuli were used. Each block contained four matching panels (5 s each) and participants indicated which of the two bottom images, left or right, match with the center-top image. Instructions were displayed for 2 s at the beginning of each block: ‘Match Emotion’ or ‘Match Pictures’.
