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. Author manuscript; available in PMC: 2023 May 17.
Published in final edited form as: Behav Res Ther. 2022 May 20;154:104124. doi: 10.1016/j.brat.2022.104124

Fig. 1.

Fig. 1.

Schematic illustrating the session and trial definitions for the assessment of Fear Acquisition, Extinction Training, and test for extinction Recall in IOP participants at pre- (Trauma Exposed Psychiatric Controls, TEPC, and PTSD + groups) and post-treatment time points (PTSD + group only). The fear acquisition session contained a CS Habituation block and three Acquisition blocks. In the Acquisition blocks, there were 12 CSs (colored shapes) reinforced on 100% of the trials paired with the US (CS+), 12 colored shapes that were not reinforced (CS-), and 12 trials of the sound probe presented without a CS (noise alone, NA). CS+ = conditioned stimulus reinforced with airblast unconditioned stimulus (US); CS-= conditioned stimulus not paired with US; NA = noise alone (baseline). Created with Biorender.com.