"Drazen Prelec, a psychologist at the Massachusetts Institute of Technology in Cambridge, US, has devised a scoring system, or “Bayesian truth serum” to encourage people to divulge their honest opinions.
"Prelec acknowledges the method cannot work as a lie detector to expose untruths at the level of a single question or even a single person. He says it works best on groups of at least 10 people. Using the mathematical formula Prelec has devised, truthful answers automatically produce higher scores." /New Scientist/
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