"The return of cold later in the Pleistocene returned selection for increased DHEA. Neandertal habitat was characterized by relative containment. The cold and containment increased DHEA and testosterone in Neandertal. Neandertal continued to increase in brain size. The teeth and facial structures and brain development of Neandertal are exaggerated due to increased testosterone and DHEA. The large teeth and brains indicate there was plenty of DHEA for sharing between various tissues. However, this large brain was increased in posterior regions, not in anterior areas. This would be consistent with early puberty." page 354 of "Androgens in Human Evolution," Rivista di Biologia / Biology Forum 2001; 94: 345-362, James Michael Howard, Fayetteville, Arkansas, U.S.A.