The illusion of truth

It seems too simplistic that just repeating a persuasive message should increase its effect, but that's exactly what psychological research finds (again and again). Repetition is one of the easiest and most widespread methods of persuasion. In fact it's so obvious that we sometimes forget how powerful it is.

People rate statements that have been repeated just once as more valid or true than things they've heard for the first time. They even rate statements as truer when the person saying them has been repeatedly lying...

And when we think something is more true, we also tend to be more persuaded by it.
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