Ingrid Bergman in the 1944 film Gaslight

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.[1] Instances 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.

Psychologist Martha Stout states that sociopaths frequently use gaslighting tactics. Sociopaths consistently transgress social mores, break laws, and exploit others, but are also typically charming and convincing liars who consistently deny wrongdoing. Thus, some who have been victimized by sociopaths may doubt their perceptions.[6] Jacobson and Gottman report that some physically abusive spouses may gaslight their partners, even flatly denying that they have been violent.[3]