An emotional face-processing task (Hariri et al, 2005) was administered, in which subjects were presented, three times each in random order, a 5-second exposure to three faces (a target and two probes), and told to match emotional expressions (happy, angry, or fearful) of targets and probes, with interspersed 12-second fixation periods between each face or control task. There were 18 trials (3 blocks of 6 trials) over 512 seconds.
