Figure 5.

Skin conductance responses (SCRs) on day 2 plotted against the extent of depletion during the (A) spontaneous recovery, (B) reinstatement, and (C) reacquisition phases. Lower x-axis values indicate greater depletion, indexed by the change in the ratio of tryptophan to large neutral amino acids (ΔTRP:LNAA) assessed via plasma samples. Raw data (following transformation) (see Supplement) are displayed, not adjusted values after controlling for intolerance of uncertainty, sex, or strength of initial conditioning on day 1. The CS− is denoted by purple circles, the extinguished CS+ (CS+E) is denoted by blue triangles, and the not-extinguished CS+ (CS+N) is denoted by green squares. Significant relationships between depletion and SCR were seen in the spontaneous recovery phase for the CS+E and CS+N but not for the CS−, in reinstatement for the CS+E and CS−, and in reacquisition for the CS+E and CS−. CS, conditioned stimulus.