16 June 1995
Vol 268, Issue 5217

About The Cover

A hamster brain and a human brain with three computer-generated intermediates to show the differential scaling of brain regions as brain size increases in mammals. A highly conserved sequence of neurogenesis produces predictable and disproportionate growth of late-generated structures as brain size increases. This suggests that processing capacity for specific functions is gained primarily by general rather than local increases in brain size. See page 1578. [Image: J. C. Crowley]