Effects of lowered serotonin transmission on cocaine-induced striatal dopamine response: PET [¹¹C]raclopride study in humans. BJP, 199, . Figure 3 (p. 394): blue diamonds should be labelled ‘BAL+cocaine’. Online Table DS1, the headings of columns five and six for parts (b) to (d) should read: (b) ‘BP_ND values on nutritionally balanced amino acid mixture + cocaine test, mean (s.d.)’ and ‘% change BP_ND induced by acute tryptophan depletion + cocaine, mean (s.d.)’; (c) ‘BP_ND values on nutritionally balanced amino acid mixture + placebo test, mean (s.d.)’ and ‘% change BP_ND induced by acute tryptophan depletion + cocaine, mean (s.d.)’; (d) ‘BP_ND values on nutritionally balanced amino acid mixture, mean (s.d.)’ and ‘% change BP_ND induced by acute tryptophan depletion, mean (s.d.)’.