Illusory Of Truth Effect
The illusory truth effect is the human tendency to believe in the correctness and validity of information after being repeatedly exposed to a single explanation. This recently identified cognitive bias (1977) relies on that fact that when the truth of a statement is assessed, the adherents tend to rely on information that feels comfortable or is inline with their personal beliefs. This is a principle that cults and extremist groups depend on. By isolating their people, either physically or intellectually and repeating the same messages, the group will come to accept this information as truth.