1344 MARATOS, MOGG, BRADLEY Figure 2. An example of a double-target trial in which T1 was a neutral face (N1) and T2 was a threat face. Procedure The experiment consisted of two tasks: a short screening RSVP task and the main RSVP task. All trials contained a RSVP stream of 20 stimuli. In the screening task, on each trial, a single target face stimulus, which was the threat face, the positive face or one of the two neutral faces, was presented within a stream of 19 distractor stimuli. The target face was always preceded by at least five and followed by at least two distractors. Thus, the target face (randomly chosen across stimulus types) could appear in one of the remaining 13 positions in the stream with equal frequency. Participants were required to press one of three response keys to indicate the expression of the target face. Selection criterion was achieved if an individual correctly identified the expression of the target faces on nine consecutive trials within a limit of up to 50 trials. The presentation of stimuli in the screening task was similar to that on single-target trials in the main RSVP task.