If a single word could capture the feel of the winter holidays, it might be glow. 
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The word itself sounds snug and warm. It suggests candlelight, 
roaring fireplaces, and lights twinkling through boughs and brightening 
the darkest days of the year. It conjures the feeling that 
accompanies gift-giving, too. Giving gifts 
reliably creates such a cozy,
 pleasurable feeling that economists dub it the “warm glow” of 
generosity. 
But much like the creeping shadows cast by even the cheeriest fire, 
the warm glow has a dark side. Economist James Andreoni, who coined the 
term, claimed that the glow of giving makes acts of generosity 
ultimately selfish: If giving feels good, how generous can it really be?
 Maybe gifts are just another way of using other people to make 
ourselves feel good.
There is no denying the rush of positive feeling that accompanies the act of giving. When researchers
 give participants a little money, those who are randomly selected to 
spend it on someone else report feeling happier than those instructed to
 spend it on themselves. Even one- and two-year-old toddlers feel happier
 after giving cookies to a puppet than after receiving treats 
themselves. And if you take away the warm glow by compensating people 
for a gift—which turns giving into a transaction—generosity declines.
Neuroscience research
 has linked the warm glow of giving to activity in a region of the brain
 called the nucleus accumbens, where the neurotransmitter dopamine is
 released, resulting in feelings of heightened well-being—and the desire
 to repeat whatever caused it. This makes dopamine a key player in 
addictions—cocaine, for example, also causes dopamine to spike. It would
 be an overstatement to equate gift-giving with an addiction, but the warm glow of giving does tend to make people want to give more, leading to ascending spirals of generosity and reward.
This positive feedback loop can drive generosity to awe-inspiring 
heights. The unforeseen rush of emotions that Bill Gates experienced 
during a trip to Africa in the 1990s to give children computers 
ultimately led him to create the mighty Gates Foundation. And a 
businessman named Rob Mather was so moved by the experience of raising 
money to help one injured child that he went on to found the Against 
Malaria Foundation, which has raised over $140 million and is described 
as the world’s most effective charity. 
In our work,
 we have interviewed dozens of some of the most extraordinary altruists 
in the world—people who have given one of their own kidneys to a 
stranger—and nearly all started out as blood donors and volunteers. To a
 person, they say that their donation brought them immense pleasure and 
that they would do it again if they could. As one altruist told us, 
"There’s a euphoria that accompanies the act of living donation which is
 difficult to explain without sounding a little crazy."
From a utilitarian perspective, it’s not crazy at all. It’s 
undeniably a good thing that giving feels good, as it motivates us to 
keep giving. But perhaps it really does make giving selfish. Andreoni 
and others argue that the emotional rewards of giving rob the act of 
real virtue. Maybe those who give the most are actually the most selfish people just angling for a dopamine rush. 
Or maybe not.
A recent review
 found that narcissists—who are genuinely selfish—are less generous than
 other people, and that when they do give gifts it’s only to impress or 
influence people, not because they genuinely care about them. This makes
 sense. If giving were just about feeling good, a truly selfish 
person would choose an easier and less costly way to get the same 
result—dopamine is also released by eating chocolate and having sex, after all. 
Another possibility is that taking pleasure in helping others is what it means
 to be generous. Think of it this way: Would you consider someone who 
gives gifts begrudgingly to be more selfless than someone who takes joy 
in it? Of course not. As Buddhist monk and neuroscientist Matthieu Ricard argues, “The fact that we feel satisfaction upon completing an altruistic action presupposes that we are naturally inclined to favor the other’s happiness. If we were completely indifferent to others’ fates, why would we feel pleasure in taking care of them?” 
Research in my laboratory
 has identified some of the brain processes that naturally presuppose us
 to take pleasure in helping. For example, in altruists who give kidneys
 to strangers, parts of the brain that support parental nurturing, like 
the amygdala and periaqueductal gray, are unusually large, densely 
interconnected, and responsive to others’ needs. Animal studies 
find that the release of the nurturing hormone oxytocin
 in these brain regions when caring for others is responsible for 
subsequent dopamine surges. This suggests that it is our fundamentally 
caring nature that moves us to help others, and that feeling good may be
 merely a lucky and foreseeable outcome of giving, rather than its 
purpose—a critical distinction.
In other words: Feel free to bask in the warm glow of gift giving 
this holiday. That feeling you are enjoying is a hallmark of generosity,
 not its absence.
ABOUT AUTHORS
Kristin Brethel-Haurwitz, Ph.D., is a Postdoctoral Researcher at the University of Pennsylvania. Abigail Marsh, Ph.D., is an Associate Professor at Georgetown University.





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