Figure 1From: Gene expression changes following extinction testing in a heroin behavioral incubation modelBehavioral experimental timeline and extinction responding results. Rats self-administered heroin for 2 weeks followed by a 90 minute extinction session that occurred either 1 day or 14 days after the final self-administration. session. Goal-directed behavior was recorded during the extinction sessions. Data represent means ± SEM. * p < 0.001.Back to article page