Say an old neuron dies. Could a 'replacement' neuron ensure continuity of the original 1000s of precise connections?
Assuming that it can't, how is it to compete with the other neurons? (There's a school of thought that neurons compete with other neurons for resources by making useful connections.)
More relevant: Does it matter if human brains renew their neurons?
We know that there is lots of redundant networks and plasticity, so if one cell goes down does it matter whether the gap gets filled by and old vs. new cell?
With 100 billion neurons we seem fine with what we have. The bigger question seems to be how to protect these 100 billion cells from degenerating.
Question: Are there any other cells in the body that are not, over time, replaced?
Might it be possible that some brains have the ability to generate new neurons, while others do not? Couldn't it be possible that evolution created such situations?