That's a misconception. The role of the brain our biology is not to direct somatomotor behavior, but visceromotor behavior. That is, the brain regulates the i

That's a misconception. The role of the brain our biology is not to direct somatomotor behavior, but visceromotor behavior. That is, the brain regulates the inside of the body. Increased cognitive capacity is largely directed to improving metabolic efficiency, immunity, and other basic bodily functions -- manipulating the external world is a bonus.