Hormone levels obtained during the alcohol self-administration paradigm. a Plasma cortisol levels for both the priming dose period and the alcohol self-administration period showed no significant treatment, time, or interaction effect. b Plasma ACTH levels showed no treatment, time, or interaction effect for the priming dose period; the alcohol self-administration period showed a significant time effect (F(4, 136)=5.18, p<0.001) but no treatment or interaction effect (vertical bars denote ±standard errors)