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Treated Unfairly? Here's Why You're Sore

Brain Imaging Studies Show Fair Treatment Activates Portion of Brain Linked to Happiness
By
WebMD Health News
Reviewed by Louise Chang, MD

April 18, 2008 -- There's no escaping the fact that life isn't always fair, but that usually doesn't make unfair treatment any easier to accept. Now new brain imaging studies may help explain why.

The research shows that being on the receiving end of fair treatment is rewarding, activating the same portion of the brain that responds to basic rewards, like food, in rats.

Being treated unfairly was shown to activate a region of the brain previously linked to negative emotions, such as moral disgust.

UCLA researchers combined brain imaging with an established psychological test of fairness called the "ultimatum game" to visualize the brain's reaction to fairness.

"The same parts of the brain that get activated in response to very basic rewards get activated in response to fairness," researcher and UCLA psychologist Golnaz Tabibnia, PhD, tells WebMD.

Fairness and the Brain

The game involves two players who have to agree on how to share a specific amount of money, with one player -- the proposer -- deciding on the amount each will get and the other player -- the responder -- determining if the offer is fair and will be accepted.

If the responder finds the offer too unfair to accept, neither player gets anything.

In the UCLA experiment, the game was fixed to present the responder with a range of very fair and unfair offers. The idea was to see how the brain responded to different fairness scenarios.

When the responder received a fair offer of $5 out of $10, the imaging showed the areas of the brain most closely tied to happiness to be highly activated.

When the responders were offered the same amount of money but in a less fair scenario -- $5 out of $23, for example -- the region of the brain closely linked to negative emotion was usually activated, Tabibnia says.

The study appears in the April issue of the journal Psychological Science.

The findings confirm and expand on earlier research showing that fairness is often more important to people than monetary reward.

"When an offer is pretty unfair -- say 20% of the total -- about half the time responders will reject it," Tabibnia says.

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