Your Brain heals and repairs itself just like your arm or your ankle does, if not better. Your brain can not only recover from neuron damage, it is constantly changing your Genes and DNA to adapt to your surroundings, the DNA in your lung cells starts healing once you quit smoking, your liver DNA heals once you stop drinking. All of this is done by the brain. Your brain alters your DNA, constantly adapting to surroundings.
Am I the only one that is a little freaked out about this?
Deepak Chopra discusses further at http://www.huffingtonpost.com/deepak-chopra/how-the-brain-got-liberat_b_319677.html