@clive I read about this in Scientific American, a couple of years ago. Blast-induced Traumatic Brain Injury. This one, for instance: https://www.scientificamerican.com/article/damage-to-pea-size-gland-may-cause-ptsd-like-symptoms/ I also seem to remember a more recent one, where they described breaching teams being especially vulnerable, because they often experience blasts in enclosed spaces.