“Probably the most widespread assumption about how the human brain evolved is that size increase was concentrated in the frontal lobes,” study lead author Robert Barton, from the anthropology department at Durham, explained in a university news release.

“It has been thought that frontal lobe expansion was particularly crucial to the development of modern human behavior, thought and language, and that it is our bulging frontal lobes that truly make us human,” he said. “We show that this is untrue: Human frontal lobes are exactly the size expected for a non-human brain scaled up to human size.”

via Size of Frontal Lobes May Not Matter for Brain Power: Study –Doctors Lounge.