resident intruder paradigm have been shown to affect neurogenesis (Mitra et al. 2006) and cocaine-induced conditioned place preference (Mclaughlin et al. 2006). The sexes have also been shown to be differentially susceptible to effects of housing density and social isolation that is a part of some of these testing protocols, which may influence genetic analysis (Chesler et al. 2002b; Devor et al. 2007; Raber & Devor 2002).
