Skip to main content
. Author manuscript; available in PMC: 2016 Aug 1.
Published in final edited form as: Biol Psychiatry. 2014 Dec 16;78(3):203–209. doi: 10.1016/j.biopsych.2014.12.008

Figure 2.

Figure 2

(A) Procedure for Experiment 2 in humans. Two groups underwent identical differential threat conditioning to initiate conditioned skin conductance responses (SCR) to a conditioned stimulus (CS+) paired with an electric shock unconditioned stimulus (US). An unpaired CS (CS−) served as a within-subjects control condition. One group then underwent standard extinction in which the US was omitted on CS+ trials, while another group underwent a modified extinction procedure in which the US was replaced by a novel non-aversive tone. Spontaneous recovery of SCRs to the CS+ versus CS− was tested 24 hours later. (B) SCR results showed equivalent acquisition (CS+ minus CS−) and extinction on Day 1. The NFE group showed no evidence of recovery 24 hours later, whereas the standard extinction group showed robust recovery. * P < .05; ** P < .01; μS = square root transformed SCRs, in microsiemens; n.s. = not significant; error bars reflect standard error.