What was one of the aims of Brendgen's study?

• A. To determine if aggression is solely environmental
• B. To analyze the role of age in social behavior
• C. To assess if social aggression is caused by genes or the environment
• D. To investigate academic performance in twins

Answer: (C)

One of the aims of Brendgen’s study was to assess if social aggression is caused by genes or the environment. This research specifically focused on distinguishing between the influences of genetic predispositions and environmental factors on the development of aggression in children. By examining twins, who share either 100% or 50% of their genetic makeup while being raised in the same or different environments, the study was able to explore the relative contributions of heredity and environment to social and physical aggression. This approach allowed for a comprehensive understanding of how these two factors interact in shaping aggressive behaviors, particularly in a social context, highlighting the complexity of developmental psychology.