Thanks for that but I googled and ask jeeved my question also and read that answer amongst others. I found that answer lacking. He or she lists a lot of things he or she thinks the brain must handle in that situation, says it is too much and so the mind shuts off because of overload. But this is just guessing. Consciousness could continue, for all we know, just blasted with white noise and something like TV screen snow. Why lots of tasks/stimuli leads to shut off is not really dealt with.
...upon receiving a blow to the head? (sometimes, that is)
upon receiving a blow to the head? (sometimes, that is)