In a typical experiment, subjects will view a film of a car accident. In the course of being questioned about what they saw, they’re casually given false information. For example, a stop sign is off-handedly referred to, although there wasn’t one in the film. Many subjects then dutifully recall seeing a stop sign. When the deception is revealed, some vehemently protest, stressing how vividly they remember the sign. The greater the time lag between viewing the film and being given the false information, the more people allow their memories to be tampered with.
