Holy crap,

I've had this too, all my life..Mine mainly comes when I watch someone learning something, or reading. I've always explained it to myself as a "knowledge uptake/absorption frequency that people broadcast. that I pick up/receive".

music and watching people write can do it too. I can create it spontaneously if I concentrate like in a meditative state..but its not as intense as the natural ones. I was researching this a bit today and ran across the ATS link and laughed.. I've been reading ATS since the beginning(but only joined last year). what a coincidence..or as George Noory would say "there are no coincidences."