What unique activities were made possible by the increase in hominin brain size?

The increase in hominin brain size is strongly associated with the development of advanced cognitive functions, particularly speech and decision-making abilities. As the brain evolved, it allowed for greater complexity in communication, enabling early humans to articulate ideas, share knowledge, and coordinate activities more effectively. This enhanced verbal communication was crucial for social interactions, planning, and the development of cultural practices.

Moreover, a larger brain also supports improved decision-making capabilities, enabling early humans to assess situations, evaluate options, and make choices that were beneficial for survival, such as navigating their environment, foraging for food, and socializing within groups. These advancements laid the groundwork for more sophisticated societal structures and collaborative strategies, which were pivotal in human evolution.