LB1 and Pan troglodytes
And how did LB1's brain compare to that of a chimpanzee? While the two brains are about the same size, they differ dramatically, the team found. LB1's has large temporal lobes, which in people are linked to hearing and understanding speech. More significantly, LB1 has highly convoluted frontal lobes, the region just behind the forehead that is associated with higher cognition. Altogether, the findings support the notion of advanced intelligence in a small package. This flies in the face of current dogma, which maintains that increased intelligence only comes through increased brain size.