Witness to Murder
directed by Roy Rowland
directed by Roy Rowland
Gaslighting is a form of emotional abuse and manipulation in which one person (usually a sexual intimate, trusted authority figure, or close family member) convinces his or her target that what they saw/experienced didn't happen, if it did happen then it's ok, and/or that the target is the one who is crazy/mistaken despite all evidence showing the exact opposite.
If the man or woman employing this tactic is really skilled, well sometimes that's how you end up with men running harems or wives convincing their husbands that the wife's constant infidelity and public disrespect is all the husband's fault. If the husband wasn't such a punk then the wife wouldn't do what she did.
Gaslighting needn't necessarily be committed by intimates though I think that's when it's most effective. One could argue that white racists have been carrying out a successful 400 year gaslighting project on Black Americans.
The term comes originally from a 1938 play "Gaslight" that was later developed into multiple films, most notably one directed by Alfred Hitchcock.