Repetition can influence how people view the truth. If a claim has been presented to a person before, they are more likely to believe it. This phenomenon, known as the illusory truth effect, sheds light on the effectiveness of propaganda and advertising as well as the reasons why people accept false information as fact. The illusory truth effect has been demonstrated in a vast number of studies, although the relatively little study has employed more than three repeats. However, assertions are frequently heard and repeated at far higher rates in the real world.
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