Adolescence is a period of neurodevelopment during which risky behaviors often increase. This may be explained by the mismatch in brain maturation between bottom-up reward processing networks (which develop early in adolescence), and top-down regulatory control networks (which develop later). However, there are significant individual differences in adolescent risk taking which could be attributable to a variety of factors, such as differences in temperament. This study investigated the neurobiological underpinnings of risk and reward evaluation as they relate to self-reported pleasure derived from novel or intense experiences on the Early Adolescent Temperament Questionnaire.