FWIW
Gas lighting is a very horrifying form of psy-op - the effort of which is to cause someone to think they are crazy - or to make others around them think the target is crazy.
There was a movie by that name, and this particular mind rape technique was named for it.
https://en.wikipedia.org/wiki/Gaslight_(1944_film)
Ahhh thanks. That refreshes my memory.
Some families seem to perpetrate that on an identified patient at times. Hideous.