Hello again! It’s amazing the things that are going on right under our noses (undergraduate noses that is). I was wondering why we can continue to form so many memories in a life time with no new cell growth after a specific age. If every memory is a new reconstruction of interacting neurons firing off with each other, wouldn’t we need new cells eventually so that the others can maintain function? I suppose this isn’t too unrealistic with billions of neurons and trillions of connections, but the idea of neurogenesis sure explains a lot.
According to a recent article from BioED, neurogenesis suggests that we can create new neurons while learning new material or having new experiences throughout life (throughout life meaning, past the age of 60). These new neurons apparently are only observed in the olfactory bulb and hippocampus of the brain, which makes sense since you are constantly creating new memories and experiencing new smells. But how neurogenesis does this is still a mystery although there are some ideas floating around out there. Check out some of these links if any of this piques your interest.