Figure 1From: Effects of a selectively bred novelty-seeking phenotype on the motivation to take cocaine in male and female rats Breaking points (BPs) on a progressive ratio (PR) schedule of reinforcement for bred High Responder (bHR) and bred Low Responder (bLR) males and females at three different doses of cocaine (Experiment 1). *P < 0.05, significant effect of phenotype within sex at that dose; $ P < 0.05, significant effect of sex within phenotype at that dose.Back to article page