Brain size

Brain size refers to the physical volume or weight of the brain, which varies among species and individuals. While a larger brain often correlates with greater cognitive abilities, it is not the sole factor; brain structure and connectivity are equally important. For example, humans have larger and more complex brains relative to body size compared to many animals, supporting advanced functions like reasoning and language. However, size alone doesn't determine intelligence—how the brain is organized and how efficiently it processes information are crucial for cognitive performance.