Psychopharmacology (2005) 182:516–526

Unfortunately, Figs. 2 and 3 were published with errors. The correct figures are given here.

Fig. 2
figure 2

Individual prefrontal lobe GABA levels in mmol/kg showing differences between before treatment (Scan 1) and after treatment (Scan 2) by group

Fig. 3
figure 3

Changes in brain GABA levels by treatment group. *The overall statistical model for the effect of drug treatment on brain GABA levels together with the baseline GABA adjustment was strongly significant (p=0.002). **GABA change-from-baseline in the pramipexole treatment group differed significantly from GABA change in the placebo group, (p=0.031)