Dopamine is a brain chemical associated with reward and motivation in the prefrontal cortex of the brain.In the study, published online in the journal Current Biology, the researchers used the drug tolcapone, which is already approved by the US Food and Drug Administration (FDA) for use in treatment of people with Parkinson's disease."We typically think of fair-mindedness as a stable characteristic, part of one's personality," said co-principal investigator Ming Hsu, assistant professor at the University of California – Berkeley.

Previous studies had shown that economic inequity is evaluated in the prefrontal cortex, a core area of the brain that dopamine affects,"We have taken an important step toward learning how our aversion to inequity is influenced by our brain chemistry," first author of the current study Ignacio Saez from the UC Berkeley pointed out.

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