Basic Methods
Loftus, Miller, and Burns (1978) conducted the original misinformation effect study. Participants were shown a series of slides, one of which featured a car stopping in front of a yield sign. After viewing the slides, participants read a description of what they saw. Some of the participants were given descriptions that contained misinformation, which stated that the car stopped at a stop sign. Following the slides and the reading of the description, participants were tested on what they saw. The results revealed that participants who were exposed to such misinformation were more likely to report seeing a stop sign than participants who were not misinformed.
Similar methods continue to be used in misinformation effect studies. Today, standard methods involve showing subjects an event, usually in the form of a slideshow or video. The event is followed by a time delay and introduction of post-event information. Finally, participants are retested on their memory of the original event. This original study by Loftus et al. paved the way for multiple replications of the effect in order to test things like what specific processes cause the effect to occur in the first place and how individual differences influence susceptibility to the effect.
Read more about this topic: Misinformation Effect