Figure 1.

(a) Schematic illustration of the context-dependent cue conditioning and extinction paradigm, consisting of a learning phase (day 1) and a retrieval phase 24 h later (day 2). (b) CS specific responses in non-smoking and smoking participants during day 1 (learning) in the danger and safe contexts measured as skin conductance responses (SCRs), (c) subjective fear and (d) US expectancy. (e) Individual amount of cigarette consumption (pack-years) is correlated with conditioned fear responses (CRs) in the safe context during learning on day 1 measured as SCRs, (f) subjective fear and (g) US expectancy.