Neuroplasticity for Dummies

I'm not a dummy so why can't they answer this simple question.
 I'll ask what should be a simple question. Or at least something I would think researchers should focus on before they prove once again that neuroplasticity works. How exactly does a neuron recruit a next door neuron to help with a task? Does it send out a cry/signal for help? Or are good samaritans running around looking for distressed neurons to help? This answer could also possibly explain why new neurons migrate to the damaged area. If we knew the answer to this the recovery of penumbra and bleed damage areas might be able to be repeatable. Heck we could send magnetic nanoparticles with the appropriate drugs to the damaged areas. If we can find the Higgs boson we can find how neurons call for help.

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