The nature–nurture debate remains central to psychology because it shapes how we explain behaviour and design interventions. Research into aggression, phobias, and mental illness shows that both genetic predispositions and environmental influences play crucial roles. For example, twin studies highlight heritability in traits such as intelligence, while experiments like Bandura’s Bobo doll demonstrate the power of social learning. These findings suggest that the most convincing position is an interactionist view, recognising that behaviour arises from the dynamic interplay between biology and environment.