A Monkey Brain is the small, wrinkled brain that has evolved over millions of years in a variety of primate species, including humans. It is believed to contain all of the same structures as a human brain, although much of its function remains a mystery. Monkeys have been known to learn complex tasks and can retain learned behaviors over long periods.
They are capable of making decisions and responding to external stimulus, suggesting they are evolutionarily advanced in terms of their cognitive abilities.