“…Adult neurogenesis has been studied in about twenty mammalian species: rodents [Galea and McEwen, 1999;Lavenex et al, 2000;Parent et al, 2002;Amrein et al, 2004;Barker et al, 2005], shrews [Bartkowska et al, 2008], bats [Amrein et al, 2007], carnivores [Hwang et al, 2007;Pekcec et al, 2008], primates including humans [Eriksson et al, 1998;Gould et al, 1999;Kornack and Rakic, 1999;Bernier et al, 2002] and marsupials [Harman et al, 2003;Grabiec et al, 2009]. In the majority of these species, new DG neurons are generated throughout life, but the rate of neurogenesis decreases sharply at young adult age to stabilize at much lower levels for the rest of their life [Maslov et al, 2004;Hwang et al, 2007;Grabiec et al, 2009].…”