MRI scans show brain's response to actions of others

August 11, 2010 by Adam Gorlick

When we believe a person is doing something nice for someone else, we really do take it personally. Our brains register the observation of a good deed as a personal reward.

It might seem like a no-brainer: We're inclined to like generous people more than stingy ones.

But what's driving our feelings about them? Is it what they're doing, or why we think they're doing it?

That's where the comes in. After studying the gray matter of 38 people in a Stanford experiment, concluded it is the perceived intentions - not the actions - of others that lead us to cherish the charitable and spurn the selfish.

The finding comes from the work of Jeff Cooper, who spent his time as a Stanford doctoral candidate studying a part of the brain called the ventromedial prefrontal cortex. Scientists already knew the region is stimulated by personal rewards, but Cooper wanted to see if it also reacts to the actions of others.

He found that it does. And his science boils down to this: When we believe a person is doing something nice for someone else, we take it personally. Our brains register the observation of a good deed as a personal reward.

That’s important information, Cooper said, because "our questions about someone’s intentions determine how we react to outcomes."

"We realized that a pretty simple manipulation of context can really change whether we feel an emotional engagement with people we don't know or have a personal or tangible stake with," he said.

Cooper’s findings will be published online Aug. 11 by the journal Neuron.

Cooper - who is now a researcher in Trinity College, Dublin's Institute for - had two groups of participants at Stanford watch people play a financial game. The players were given a bit of money and told to pitch in as much as they want to a common pot, which Cooper and his colleagues doubled. At the end of the game, the money was evenly split among the players.

The only difference between the groups of observers involved how the actions of the players were described. One set of subjects was told the players were engaged in a "stock market game," where their decisions could result in personal loss or gain. The other subjects were told they were watching a "public goods game," where the players could help everyone make more money.

While the activities and strategies of the players were consistent when both groups of observers watched them, the test subjects had quite different feelings about them.

Tracking their brain reactions using specialized MRI scans, Cooper and his fellow researchers could tell that watching people play the “stock market" game didn't incite much activity in the ventromedial prefrontal cortex.

But when it came to watching the players in the so-called "public goods" game, activity in that brain region fired up.

Those who gave generously to the common pot were met with brain signals showing positive emotions, suggesting the observers really liked those players. And players who withheld contributions were regarded with disdain.

"The test demonstrates that what people do doesn't really matter all the time," said Brian Knutson, an associate professor of psychology and neuroscience who co-authored Cooper’s paper. "What we think others are intending is what really matters. Essentially, even though people saw the exact same game, framing the game changed the test subjects’ neural reactions to the players."

Understanding how and why people react to others’ giving and taking can help politicians persuade voters on tricky issues like welfare, taxes and education. It can help jurors decide disputes. And it can explain why people get so upset when Wall Street bankers get huge bonuses even as the stock market crumbles.

"If your perspective is: 'How could they make so much money when the policies they've adopted are so questionable?' that means you're thinking about the world of investment as a public goods game," Knutson said.

Explore further: Poor recognition of 'self' found in high functioning people with autism

Related Stories

Deal or no deal? The role of emotions in negotiating offers

October 15, 2008

Do skilled negotiators simply go with their gut instinct every time or are they just extremely calculating, figuring out all possible outcomes before making a choice? Columbia University researchers examined how emotions ...

Marching to the beat of the same drum improves teamwork

January 28, 2009

Armies train by marching in step. Religions around the world incorporate many forms of singing and chanting into their rituals. Citizens sing the National Anthem before sporting events. Why do we participate in these various ...

Effects of brain exercise depend on opponent

February 4, 2009

Playing games against a computer activates different brain areas from those activated when playing against a human opponent. Research published in the open access journal BMC Neuroscience has shown that the belief that one ...

Perceived intentions influence brain response

August 11, 2010

People generally like to see generous people rewarded and selfish people punished. Now, new research reveals a critical link between how we perceive another's intentions and our evaluation of their behavior. The study, published ...

Recommended for you

How the finch changes its tune

August 3, 2015

Like top musicians, songbirds train from a young age to weed out errors and trim variability from their songs, ultimately becoming consistent and reliable performers. But as with human musicians, even the best are not machines. ...

Machine Translates Thoughts into Speech in Real Time

December 21, 2009

( -- By implanting an electrode into the brain of a person with locked-in syndrome, scientists have demonstrated how to wirelessly transmit neural signals to a speech synthesizer. The "thought-to-speech" process ...


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.