Artemis - I'm not sure you'd want to stimulate brain tissue to grow this way - If I'm not mistaken, brains and other nerve tissue do not normally divide and grow.
But if an extracellular matrix could force it to do so despite everything, I'm sure everyone would be very excited to see what it turned into. Volunteers? :)
Neurons do divide and grow at various developmental stages; and they also have stages for pruning. Not sure if it would affect the neurons,though...sounds very, very neat.
four weeks?! When a friend did basically the same to his finger, it took a bit longer for that to heal, and that was with all the medicine being thrown at him AND the missing fingertip.
I'm anxious to see how this works with bones and internal organs.
This story was actually in an issue of Esquire a few months ago -- I'll have to dig that issue out. It was really neat to read about. The one thing that the guy who grew his finger back said, was that the very tip of the finger was a little tougher than the rest of the skin and that it had a slight odor to it. (Pretty sure I'm remembering that correctly...Obviously for good press, they might be leaving those parts out.)
Actually, and not to sideline this discussion, but that issue of Esquire also had some other interesting science things going on. One of them was a person using viruses to encode antibodies/viruses in hopes of using it to cure cancer and other diseases. Since viruses, have a much better and "natural way of invading cells than things that we've been able to come up with. The reason that story really stuck out to me, was because of the near identical idea used in I Am Legend.
I'd imagine regrown parts of the brain would act differently, as the nueral pathways that one creates over a lifetime (and much of that in childhood) would not be there. New ones would form, given time. But the (seemingly) random pathways and associations that help form your personality would change, I'd think. I mean, people with neural damage can have quite abrupt and total changes of personality, tastes, etc.
It might depend on what part of the brain was regrown/replaced. Makes a good argument for a long-term brain structure memory back-up to avoid that sort of thing.