A form of psychological manipulation where someone systematically makes another person question their own memory, perception, or judgment. The victim gradually loses confidence in their ability to distinguish truth from falsehood.
Named after the 1944 film 'Gaslight' where a husband manipulates his wife into believing she's going insane by dimming gas lights and denying it's happening. The term entered psychological vocabulary in the 1960s and became widely recognized in discussions of emotional abuse.
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