Interesting: it sounds like we do something similar with animals (training them
not to close down their focus and fixate on things that might well, in a state of nature, be alarming, but don't really matter when living with people in a 21st century environment) but it's kind of hard to say while the Fehmi exercises are still in copyright...
EDIT: the pain relief part seems completely orthogonal to what I was talking about above, but the perception of attention and especially gaps in attention is something that one finds in japanese martial zen...
(for instance, the "3 pwns": the lowest level is to "pwn the sword", where you physically react quickly enough to counter an opponent's action; the intermediate level is to "pwn the technique", where by recognising the start of a technique one can predict where it will end, thus gaining time to counter; the advanced level is to "pwn the spirit", where by recognising where an opponent's attention lies one can predict what techniques they will attempt, thus gaining even more time...)