"The Twenty"

"The Twenty" refers to the total number of brain regions in the human cerebral cortex that are interconnected through a complex network of neural pathways. These regions work together to support cognitive functions such as perception, decision-making, memory, and language. The term highlights the idea that a core set of brain areas forms a highly integrated system essential for conscious thought and behavior. Understanding these 20 key regions helps researchers study how different parts of the brain coordinate and communicate during various mental processes and responses.