Figure 6.

A, Cumulative cue DA and the change in relative peak cue DA have a very strong relationship with impulsivity when examined together using a linear regression model. Entering cumulative cue DA and the change in relative peak cue DA as independent factors into a multiple linear regression model significantly predicted impulsivity in the delay discounting task better than either factor did on its own. The x-axis is the standardized predicted value derived from the model. B, Entering cumulative cue DA and relative peak cue DA as independent factors into a multiple linear regression model significantly predicted behavioral choice during the short delay (10 s) block, but not during the other blocks.