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.
Pero nos anos 90, algúns estudos comezaron a demostrar, seguindo o camiño de Elizabeth Gould en Princeton e doutros, que había probas de neuroxénese, do nacemento de novas neuronas, no cerebro dun mamífero adulto; primeiro no bulbo olfactivo, responsable do sentido do olfacto, despois no hipocampo, que actúa na memoria a curto prazo, e finalmente na propia amígdala.