The experiment reported here uses a conditional self-discrimination task to examine the influence of social interaction on the facilitation of selfdiscrimination in rats. The study is based on a previous report (PenagosCorzo et al., 2011) showing positive evidence of such facilitation, but extending the exposition to social interaction conditions prior to training. Specifically, rats were assigned to three conditions with different levels of social interaction and exposed to two conditional self-discrimination tasks, under an avoidance and positive reinforcement paradigm, where they had to discriminate their own internal state (with or without methylphenidate). Our results indicate that conditional self-discrimination was higher in groups with higher social interaction than in those with lower interaction and support the conclusion that self-discrimination learning curves for different degrees of social interaction positively increased with number of sessions and level of interaction. Conditional self-discrimination is a form of learning in which the behavior of each individual is discriminated socially, with the intervention of the contingencies of reinforcement (Dymond & Barnes, 1997). The study of this process has its roots in the work of Beninger, Kendal and Vanderwolf (1974) with rats. Even in the eighties it was widely believed that self-discrimination was a uniquely human phenomenon tied to language or verbalization (Perez-Acosta, Benjumea Rodriguez & Navarro Guzman, 2001); however, it is possible to state that verbal language is not a