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I suspect the difference between contact sports and motorsport is the frequency of the impacts. I've had one shunt that knocked me out, and one which left me a bit wobbly for a while, but that was in several years of racing. It's not like you're having your brain wobbled about week in, week out, plus training.
Regarding bodily constraint, I’ve read that one of the issues with grid iron football is that there’s no way of preventing the brain from jiggling around inside the skull in an impact (although proper hydration helps). I wonder what the stats are for race drivers and long term brain injury?