Given some memory test for the original video or slides. Addition of Information to Memory a. Altering information in Memory a. Series of slides depicting an accident in which one slide showed a car at a stop sign or yield sign. Shown car at stop sign or at yield sign. Giving people misleading information violates normal conventions.
People assume that the misleading information is true.
Or some kind of demand characteristic - doing what the experimenter expects. Psychologists have made recommendations of how eyewitness accounts should be collected by law enforcement officials. The same thing can happen with identification of criminals from mug shots or lineups. For example, if you described the criminal as being short with black hair, the functional size of the lineup is the number of people in the lineup who are short with black hair, regardless of how many people are in the lineup. Prospective memory is often more about remembering when to do something vs remembering what to do.