Gaslighting is an abuse tactic. The term comes from a play called Angel Street dating back to 1938. It’s about a husband who manipulates his wife’s at-home environment to psychologically confuse her. Wikipedia defines it as “a form of mental abuse in which information is twisted or spun, selectively omitted to favor the abuser, or false information is presented with the intent of making victims doubt their own memory, perception, and sanity.”
When someone has been gaslit for a long time, they sometimes develop what I’ve coined as Detective Syndrome. Detective Syndrome is a phenomenon where one has been on the receiving end of the mental abuse known as gaslighting so much, that they become obsessive about finding the truth.