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The tendency to compulsively lie may be attributed to the structure of your brain. A recent study conducted at the University of Southern California (USC) shows that if you have a history of lying, your brain might actually be structured differently than that of a person who is generally honest.
White matter in the prefrontal cortex (the front part of your brain) is responsible for masterminding a lie, which includes weighing how the other party will respond and suppressing your own emotions to limit or eliminate the appearance of nervousness. Gray matter is the substance that curbs the impulse to lie to make things easier and holds people to their principles.
In the USC study, compulsive liars showed a higher percentage of white matter and a deficit of gray matter.
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