Figure 1. Experimental paradigm and skin conductance responses.

(A) An initial cue indicated whether the trial involved potential shock or not (threat and safe trials, respectively). In the former case, in 33% of the trials, an unpleasant electrical stimulus was administered for 500 ms during the cue-target interval. During the target period, a Stroop stimulus was presented and involved neutral, congruent, and incongruent conditions (for simplicity, not all task phases are displayed; see text). (B) For display purposes, untransformed SCRs were averaged as a function of condition. A robust effect of threat is apparent. The error bars represent the standard error of the mean.