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. 2021 May;6(5):590–598. doi: 10.1016/j.bpsc.2020.12.012

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© 2021 Society of Biological Psychiatry. Published by Elsevier Inc.

This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

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Tryptophan depletion reduced skin conductance response (SCR) expression. SCRs are displayed from the (A) spontaneous recovery, (B) reinstatement, and (C) reacquisition phases. Large brackets denote a main effect of stimulus. ∗∗p < .01; ∗p < .05. Error bars indicate ±1 SE. 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. CS, conditioned stimulus; CS+E, extinguished CS+; CS+N, not extinguished CS+.