Andrew Huberman· PhD
And then the molecule dopamine, this neuromodulator, that is associated with motivation and drive. And in some cases, if it's very, very high with mania, or if it's very, very low with depression or Parkinson's, but for most people where dopamine is in essentially normal ranges dopamine is also a powerful trigger of the establishment of these new neurons and their migration into the olfactory bulb and your ability to smell.