How unused is the letter z on your keyboard when typing? Different regions of the brain serve different functions, so though they aren’t always activated, they are necessary.
Besides, obsolete and unused brain tissue is very expensive calorically to maintain, and would be a hinderance to survival over long periods of time.
Besides, obsolete and unused brain tissue is very expensive calorically to maintain, and would be a hinderance to survival over long periods of time.