Figure 4.

Differences in cue DA as a function of impulsivity. A, Animals grouped as having low (history of cocaine, n = 5; water/saline, n = 2) or high (history of cocaine, n = 2; water/saline, n = 5) impulsivity exhibited significantly different delay discounting behavior. B, Change in cue DA as a function of time (average of all delays and magnitudes). Cue onset and duration is indicated by the black bar below the trace. Inset, Animals with low impulsivity had significantly higher cumulative cue DA than animals with high impulsivity, **p < 0.01. C, Percentage choice of the large/delayed reward significantly correlated with cumulative cue DA.