[2026] PTE Academic Reading - Multiple Choice, Single Answer

The revival of the 'Social Brain Hypothesis' has provided a compelling evolutionary explanation for the unusual size of the human neocortex. This theory suggests that the cognitive demands of navigating complex, multi-layered social groups drove the expansion of our brain capacity. Unlike other mammals whose brain size correlates with physical tasks like hunting or navigation, primates show a distinct correlation between the complexity of their social networks and the volume of their frontal lobes. However, some critics argue that this view is overly anthropocentric, neglecting the role of dietary shifts and the metabolic cost of brain tissue. They contend that the transition to nutrient-dense cooked foods provided the necessary caloric surplus for neural growth long before social complexity became a dominant factor. While social dynamics undoubtedly refined human intelligence, we must not ignore the physiological prerequisites that made such an expensive organ possible in the first place. A comprehensive understanding of human evolution requires us to see the brain not just as a social computer, but as a biological engine constrained by its fuel source.