Impulsivity and aggressive behavior in Roman high and low avoidance rats: Baseline differences and adolescent social stress induced changes

► We show baseline and social stress induced differences in personality in Roman rats. ► This study confirms a higher baseline level of impulsivity in RHA rats. ► The level of offensive aggression is equal in the two lines of Roman rats. ► Social stress during adolescence disturbs the normal development of personality. ► Roman high avoidance rats are mostly affected by social defeat during adolescence.