Which statement best illustrates the social brain hypothesis?

Which statement best illustrates the social brain hypothesis?

• A. The social brain hypothesis suggests primate and human brains evolved large neocortex sizes primarily to manage complex social relationships and group living.
• B. The social brain hypothesis claims that language alone drives brain size.
• C. The social brain hypothesis asserts energy constraints limit brain size.
• D. The social brain hypothesis states that social media use shapes brain development.

Answer: (A)

The central idea here is that living in complex social groups has shaped brain evolution, especially the growth of the neocortex needed for social thinking and managing relationships. The statement that primates and humans evolved large neocortex sizes primarily to handle complex social relationships and group living directly captures that idea. It links bigger brain size to the cognitive demands of social life across species, aligning with findings that societies with richer social networks tend to have relatively larger neocortices. Other ideas miss the evolutionary emphasis of the social brain hypothesis. Language matters for communication but isn’t presented as the primary driver of overall brain size. Energy constraints play a role in brain development, but that points to metabolic limits rather than the social pressures that the hypothesis highlights. Social media represents a modern influence, not the historical process the hypothesis seeks to explain.

The central idea here is that living in complex social groups has shaped brain evolution, especially the growth of the neocortex needed for social thinking and managing relationships. The statement that primates and humans evolved large neocortex sizes primarily to handle complex social relationships and group living directly captures that idea. It links bigger brain size to the cognitive demands of social life across species, aligning with findings that societies with richer social networks tend to have relatively larger neocortices.

Other ideas miss the evolutionary emphasis of the social brain hypothesis. Language matters for communication but isn’t presented as the primary driver of overall brain size. Energy constraints play a role in brain development, but that points to metabolic limits rather than the social pressures that the hypothesis highlights. Social media represents a modern influence, not the historical process the hypothesis seeks to explain.