--but I seem to be able to distinguish between muscular/vascular throbbing and neurological throbbing; the latter is lighter, and more surface, with more of an electrical component.

I have, quite often, gotten a cycling "shooting" type of jolt in many body parts--a repeating impulse with a period of one-to-two seconds or so. This periodicity is longer than that of a typcially cascular throb, which cycles at a few times per second. It seems to be associated with some form of compressive action in the particular area.