well considering head injuries are rising despite the increased use of bike helmets, it seems the neurologists are getting the same or more work than they ever have. And besides their speciality isn't really the mechanism of bicycle helmets now is it? A more credible source of information would lie in the experts that design and maintain the standards of the protection helmets provide. like Brain Walker the director of Head Protection Evaluations, the principal UK test laboratory for helmets. (there are views of leading neurologists in this paper, if you're interested enough to read them)