Effect of tryptophan depletion on the attentional salience of smoking cues

Brian Hitsman*, Bonnie Spring, Regina Pingitore, Marcus Munafò, Donald Hedeker

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Rationale: There is increasing evidence linking cigarette craving and smoking behavior to serotonergic neurotransmission. Objectives: The purpose of the current study was to examine the effects of a serotonergic challenge on the attentional salience of various cues associated with cigarettes. We hypothesized that cigarette-related word cues would be more distracting after acute tryptophan depletion than after a placebo challenge. We also hypothesized that smokers vulnerable to recurrent depression would show greater attentional bias towards these cues than smokers without a history of depression. Methods: Thirty-four smokers diagnosed as having (n=15) or lacking (n=19) a history of DSM-IV major depressive disorder (MDD) underwent acute tryptophan depletion (ATD) and placebo challenges in double-blind and counterbalanced order 1 week apart. Five hours after consumption of each mixture, subjects completed a modified Stroop task to measure attentional bias to smoking-related, positive affect, and negative affect word cues. Stroop interference was calculated as a difference score between latencies for the motivationally salient and the neutral (furniture) word lists. Results: Controlling for change in dysphoric mood from baseline to 5 h, repeated measures MANOVAs showed that ATD, as compared to placebo challenge, produced greater interference for smoking word cues [F(1,29)=4.15, p=0.05], but not for negative [F(1,29)=2.78, p=0.11] or positive [F(1,29)=1.60, p=0.22] affect word cues. Conclusions: Acutely compromising central serotonergic neurotransmission via ATD heightens the attentional salience of cigarette-related cues, perhaps by triggering reward and motivational deficits underlying nicotine dependence.

Original languageEnglish (US)
Pages (from-to)317-324
Number of pages8
Issue number3
StatePublished - Jun 2007


  • Attentional bias
  • Cigarette smoking
  • Craving
  • Major depression
  • Nicotine dependence
  • Serotonin
  • Tryptophan depletion

ASJC Scopus subject areas

  • Pharmacology


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