But then, in the 1990s, studies starting showing, following the lead of Elizabeth Gould at Princeton and others, studies started showing the evidence of neurogenesis, the birth of new brain cells in the adult mammalian brain, first in the olfactory bulb, which is responsible for our sense of smell, then in the hippocampus involving short-term memory, and finally in the amygdala itself.
Ali 1990.-ih istraživanja su pokazala, na čelu s Elizabeth  Gould sa Princetona istraživanja su pokazala  dokaze o neurogoenezi, stvaranju novih neurona u odraslom mozgu sisavca, prvo u olfaktornom bulbusu, odgovornom za njuh, zatim u hipokampusu uključenom u kratkotrajno pamćenje, i naposljetku u amigdali.