Figure 1. Trial sequence and experimental design.

(A) Sequence of events in a single dot-probe trial: a fixation cross (500 ms) was followed by a face pair presentation (500 ms), and a probe (the letter E or F) appearing in the space vacated by one of the faces (until response); (B) Six experimental groups were used, reflecting a 2-by-3 design of Training Condition (ATT, Control) by Rest Duration between Session 1 and 2 (No-Rest, 1 Hour, 24 Hours). ATT = attend-threat training.