Gaslighting

Gaslighting is a form of psychological abuse in which false information is presented with the intent of making a victim doubt his or her own memory, perception and sanity. It may range simply from the denial by an abuser that previous abusive incidents ever occurred, up to the staging of bizarre events by the abuser with the intention of disorienting the victim.

The term "gaslighting" comes from the play Gas Light and its film adaptations, in which a husband secretly dims the gas lights in the house and, when his wife remarks on it, he claims that she is mistaken. This is done to convince the woman that she cannot trust her own judgment, and so will not be believed if she tries to report other strange things that are genuinely occurring, which the husband wishes to keep secret. The term is now also used in clinical and research literature.