: The title comes from a specific tactic Gregory uses: he secretly turns on the gas lights in the attic to search for the jewels, which causes the lights in the rest of the house to dim. When Paula notices the dimming, Gregory insists she is imagining it, undermining her trust in her own senses. The Psychological Concept: Gaslighting
"Gaslight" is a multifaceted term that refers to both a foundational piece of mid-century media and a modern psychological concept derived from it. Gaslight
A Brief History of the Term Gaslighting and the Movie Behind It : The title comes from a specific tactic
