Liar, Liar! Brain Circuit Predicts Others' Honesty

Via New Scientist (H/T Deception Blog). 

Humans have "theory of mind" - the ability to imagine what others are thinking and learn from their social habits. "We're trying to find a specific circuit that performs social learning," says Matthew Rushworth at the University of Oxford, who presented his work at a Cell Press LabLinks conference in London on 3 December.

Rushworth's team scanned volunteers' brains while they chose one of two boxes to win points. They were sent advice on which box to choose from a second player who was sometimes dishonest. When the volunteers suspected they were being lied to, activity levels rose in the dorsomedial prefrontal cortex (DPFC), an area near the front of the brain. If the volunteer thought the player was telling the truth the activity remained low. If their suspicions were proved wrong, the activity changed "suggesting the volunteers needed to rethink their opinion of the second player", says Rushworth. In effect, the activity was predicting how trustworthy the advice would be, then reacting to the results of that prediction (Nature, vol 456, p 245).

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