Table 1.

Infusions during self-administration (top rows) and Active Lever Responding (bottom rows) in rats that received saline (left column) or cocaine (middle column). There were no significant differences between groups as noted by p-values (right column).

SELF-ADMINISTRATION INFUSIONS (Days 11-12)	SALINE	COCAINE
Drug Naïve	n/a	n/a
Self-administration	42.7±9.8	48.9±7.6	P=0.4
Self-administration and extinction	39.5±7.8	47.4±7.4	P=0.3
EXTINCTION ACTIVE LEVER RESPONDING (Days 7-8)
Drug Naive	n/a	n/a
Self-administration	n/a	n/a
Self-administration and extinction	8.8±2.7	7.4±0.9	P=0.6