Each rat’s peak [DA] response to a self-administered cocaine infusion, as a percent of baseline, was correlated with that rat’s performance on several tests of addiction-like behavior. The peak [DA] response, as a percent of baseline, predicted cocaine-induced nose pokes (measured during the microdialysis test session) (a) and PMax from the most recent threshold test (b), but did not predict Q0 from the most recent threshold test (c).