Neurological damages will only result from genetics,poisons,drugs,contaminations and nutritional dysbolisms.And what's more,neruological damages are not the same as we think the way they are.If your language center is really damaged then u will suffer Aphasia and should practive single letter accent and so on.Crucially different frm stutter. So neurological damages are just jokes made by stuttering laymens. Even if your neuros really with some invisible problems,it's commonsense that neuro plasticities can recover and reforge your neuros as u would like your brain improved or degraded.