I posted in the thread "Is Laura London the inventor of this effect?" and of course, my question was ignored in all of the responses.
Now why would you ask a question like that?
This is one of her signature effects. I'd wager that the trick was developed using some original ideas combined with the work of prior magicians. When you get right down to it, there's probably extremely few genuinely original tricks out there today, tricks that weren't built on the shoulders of other magicians. If she didn't develop it herself, she would certainly have bought the rights to it from the person who did.
There's a lot of magic that people develop at least in part for other magicians; I met a couple of David Blaine's consultants the night he had me visit his office, about a year-and-a-half before "Electrified". Dai Vernon himself I like to refer to as "the greatest magician you've never heard of" when talking to non-magicians about him, because while he may have been one of the greatest magicians and card men alive, he did practically no public performances, sharing his magic with peers and students/apprentices. He gets major props in the community and is practically worshiped by the people who met him and knew his work, but even in his day fewer than one in a thousand people were likely to know his name.
(Hell, I still run into a surprisingly large number of people who've never heard of David Blaine, either...)