
Study: Romantic love affects brain like drug addiction
It's a dance between logic and impulse, lead and follow
01:13 PM CDT on Tuesday, September 4, 2007
By SUSAN BRINK / Los Angeles Times
[Click image for a larger version] CARLOS CHAVEZ/Los Angeles Times
CARLOS CHAVEZ/Los Angeles Times
'Chemistry is more than just being hot or handsome,' says Gian Gonzaga, a senior research scientist at eHarmony Labs.
Her front brain is telling her he's trouble. Look at the facts, it says. He's never made a commitment, he can't keep a job.
But her middle brain won't listen. Man, it swoons, he looks great in those jeans, his black hair curls onto his forehead so adorably. His front brain is lecturing, too: She's flirting with every guy, and she can drink you under the table, it says. His mid-brain is unresponsive, distracted by her come-hither stare.
"What could you be thinking?" their front brains demand.
Their middle brains, each on a quest for reward, pay no heed.
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Alas, when it comes to choosing mates, smart neurons can make dumb choices.
And so begins the dance of attraction, infatuation and, ultimately, love.
Mystery for the ages
It's a dance that holds many mysteries.
It was only in 2000 that two London scientists selected 70 people, all in the early sizzle of love, and rolled them into the giant cylinder of a functional magnetic resonance imaging scanner, or FMRI.
The pictures were a revelation, and others have followed, showing that romantic love is a lot like addiction to alcohol or drugs. Yet the chemistry between two people isn't just a matter of molecules. Attraction also involves personal history. "Our parents have an effect on us," says Helen Fisher, evolutionary anthropologist at Rutgers University. "So does the school system, television, timing, mystery."
The dance that leads to a stable commitment moves through several steps.
First comes initial attraction. Next comes the wild infatuation of romance. The brain uses its chemical arsenal to focus our attention on one person.
"Everyone knows what that feels like. This is one of the great mysteries. It's the Love Potion No. 9, the click factor, interpersonal chemistry," says Gian Gonzaga, senior research scientist at eHarmony Labs.
After that, says relationship researcher Arthur Aron, psychologist at the State University of New York at Stony Brook, something more stable takes over: the steady pair-bonding of what's called companionate love.
That initial spark can flash and fade. Or it can become a flame and then a fire, a rush of exhilaration and sense of union that scientists know as passionate love.
Key to this state of seeing a person as a soul mate instead of a one-night stand is the limbic system, nestled deep within the brain between the neocortex (the region responsible for reason and intellect) and the reptilian brain (responsible for primitive instincts). Altered levels of dopamine, norepinephrine and serotonin – neurotransmitters also associated with arousal – wield influence.
But passionate love is also "a drive to win life's greatest prize, the right mating partner," Dr. Fisher says. It is, she says, an addiction.
People in the early throes of passionate love, she says, can think of little else. They describe sleeplessness, loss of appetite and feelings of euphoria, and they're willing to take exceptional risks. Brain areas governing reward, obsession, recklessness and habit all play their part in the trickery.
In an experiment published in the 2006 book Evolutionary Cognitive Neuroscience, Dr. Fisher found 17 people who were in relationships for an average of seven months. All said they'd feel deep despair if their lover left, and they yearned to know all there was to know about the loved one.
She put them in an FMRI to see what areas of their brains got active when they saw a photograph of their beloved ones.
"We saw activity in the ventral tegmental area and other regions of the brain's reward system associated with motivation, elation and focused attention," she said. It's the same part of the brain that presumably is active when gamblers think they're going to win.
"At that point, you really wouldn't notice if he had three heads," Dr. Fisher says. "Or you'd notice, but you'd choose to overlook it."
More research
Lucy Brown, professor of neuroscience at the Albert Einstein College of Medicine, has also taken FMRI images of people in the early days of a new love. In a study reported in the July 2005 Journal of Neurophysiology, she too found key activity in the ventral tegmental area. "That's the area that's also active when a cocaine addict gets an IV injection of cocaine," Dr. Brown says. "It's not a craving. It's a high."
Biologically, the cravings and pleasures unleashed are as strong as any drug. Certain brain regions, scientists have found, are being deactivated, such as within the amygdala, associated with fear. Excited brain messages reach the caudate nucleus, a dopamine-rich area where unconscious habits and skills, such as the ability to ride a bike, are stored.
The attraction signal turns the love object into a habit, and then an obsession. According to a 1999 study in the journal Psychological Medicine, people newly in love have serotonin levels 40 percent lower than normal people do – just like people with obsessive-compulsive disorders.
HAPPILY EVER AFTER
Beyond the chemistry of passion and romance lies the hope of happily ever after.
Researchers call this state companionate love, the kind of love people feel after years of arguments, joy, tragedies and successes mutually felt. To arrive there, couples have to get on the road to success pretty quickly. About a third of divorces occur after just four years of marriage, according to Janice Kiecolt-Glaser, psychologist at the Ohio State University College of Medicine.
Here are success tips from relationship experts, based on surveys of couples in lasting relationships.
•They kid themselves a bit. For example, they typically underestimate their partners' interest in others. "If you show people pictures of attractive men and women and ask how their partner will look at this person, they underestimate the person's attractiveness to their partner," says Gian Gonzaga, senior research scientist at eHarmony Labs. "It turns out that's actually good, because we're not constantly worrying and obsessing."
•They don't update images of each other. "People stick with their initial view," says Mr. Gonzaga. "As people get older, they get less attractive, but we don't update."
•They have a matching story profile, and they stick to it. Robert Sternberg, dean of the school of arts and science at Tufts University, describes the "fairy tale story" with a prince and a princess; the "travel story," which says that life is a journey; the "war story," where both expect constant fights. "What our research shows is that couples tend to be more satisfied if they have matching story profiles," Dr. Sternberg says.
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Study: Romantic love affects brain like drug addiction | Dallas Morning News |