Theres a few different mechanisms behind it. A strike to the head leaves the brain bouncing around inside and enough of that will cause a reaction similar to an emergency reboot on a computer.
Also along your neck there are bundles of nerves that travel behind the jaw. A quick pinch of the nervebundle will overload the brain and again. Restart
You can be knocked out by any violent abrupt strike to the head. Also your diaphragm, chest, and gut can ge hot hard enough to knock you out also
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