Averaged psychostimulant- and stimulation-dependent effects.

A. The maximal concentration of electrically evoked dopamine ([DA]_max). B. Vesicular release ([DA]_p). Stimulus duration is shown along the x axis. Psychostimulants differentially elicited stimulus-dependent effects on [DA]_max and [DA]_p. Data are the ratio of post-drug over pre-drug response (Post/Pre) for the dorsal (left) and ventral (right) striatum and are expressed as mean ± SEM. *, significantly different from saline (p<0.05).