What happened in the film
The plot is simple: the husband wants to get to valuables hidden in the house, so he drives his wife to doubt her own sanity. He hides things and says she lost them. He hears footsteps in the attic along with her, then insists there were no footsteps.
The light is the key detail. The lamps dim when he turns on the light upstairs - meaning someone is up there. His wife sees it with her own eyes, yet she's told again and again that no one dimmed the lights. Her trust in her own eyes is the last thing to collapse.
How this differs from an ordinary disagreement
We remember things differently, and we may both be wrong. We argue about an event.
One person repeatedly declares the other's perception defective. The argument isn't about the event, but whether you can trust yourself.
The difference is in the pattern and the direction. People really do remember things differently, and that's normal. The warning sign is this: if only one person is wrong again and again, while the other never is, the issue is no longer memory.
The last point makes the tactic durable. As long as there are people you can ask, "Did you see it that way too?" the picture comes back into focus. That's why narrowing your social circle isn't a side effect, but a condition that makes the whole thing work.
Use the word carefully
The term has become fashionable, and people now use it for any disagreement. That does harm: if every "I don't remember it that way" is called gaslighting, the word stops referring to what it was created to describe, and real cases get lost in the noise.
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Sources
- The name for the tactic comes from Patrick Hamilton's 1938 play and its 1944 film adaptation. The term became established in psychological literature much later, in the second half of the 20th century