A) Representative traces of cortically-evoked NO efflux recorded prior to, and 10–20 (#1) or 30–40 (#2) min following intrastriatal SKF (5 μM for 10 min) infusion. Electrical stimuli were delivered for 100 sec as trains (30 Hz, 750 μA, 800 ms train duration, 2 sec inter-train interval) and all stimulations were separated by >15 min. B) The mean ± S.E.M. increase in NO efflux evoked by cortical train stimulation was transiently potentiated by intrastriatal infusion of SKF (*p<0.05 as compared to pre-SKF group using one-way ANOVA with Bonferroni post-hoc test, n=6 rats).