Social behavior in rats is a phenomenon that is often studied in rats. Previous studies have found that social housing has an attenuating effect on the motivation to self-administer methamphetamine (METH) in female rats. Interestingly, females tend to benefit from having a cage mate while male rats do not. In order to understand how social behavior could be attenuating METH-taking behavior, the quality of the relationships between cage mates is being investigated to look at potential causes of this sex difference. Additionally, we are looking at dopamine (DA) release changes in the nucleus accumbens during baseline and after METH injections using fast scan cyclic voltammetry to understand the underlying neurochemical mechanisms that are occurring with different social housing conditions.