Fig. 1.

Sample Block. Paradigm consisted of alternating period of threat and safe, indicated by colored borders with the same respective labels. Each task block began with an instruction screen (view, 1-back, 2-back, or 3-back), followed by a fixation cross. Letters were presented for .5 s, and separated by a 2 s ITI. Participants responded to each letter based on whether the letter was the same as the letter one, two, or three trials back, depending on the task