A little known, counter-intuitive communication phenomenon called “the sleeper effect” means that outright lies can become more persuasive over time even when they come from a source who isn’t credible, according to decades of academic research.
Under the right conditions, researchers say the effect can make shaky stories even more believable than trustworthy ones, particularly if the message is shocking enough to have a strong initial impact on a person’s attitude and the source isn’t revealed until after the message is delivered.
So imagine hearing something that makes a strong impact on you … only to learn the source is someone you don’t find credible or whose intentions may be tainted. The sleeper effect means that as time passes, you may be likely to become more, not less, persuaded by what you heard, regardless of your feelings about the source.
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