This is your brain on love
HER front brain is telling her heâs trouble. Look at the facts, it says. Heâs never made a commitment, he drinks too much, he canât hold down a job.
But her middle brain wonât listen. Man, it swoons, he looks great in those jeans, his black hair curls onto his forehead so adorably, and when he drags on a cigarette, heâs so bad heâs good.
FOR THE RECORD
Love: An article in last weekâs Health section on the biologyof falling in love misquoted Katharine Hepburnâs character in themovie âOn Golden Pondâ as saying (of Henry Fondaâs character), âHeâsmy knight in shining armor.â The correct quote is, âYouâre my knightin shining armor.â
His front brain is lecturing, too: Sheâs flirting with every guy in the place, and she can drink even you under the table, it says. His mid-brain is unresponsive, distracted by her legs, her blouse and her come-hither stare.
âWhat could you be thinking?â their front brains demand.
Their middle brains, each on a quest for reward, pay no heed.
Alas, when it comes to choosing mates, smart neurons can make dumb choices. Sure, if the brainâs owner is in her 40s and has been around the block a few times, she might grab her bag and scram. If the guy has reached seasoned middle age, he might think twice about that cleavage-baring temptress. Wisdom -- at least a little -- does come with experience.
But if the objects of desire are in their 20s, all bets are off. A lot will depend on the influence of Mom and Dadâs marriage, the gossip and urgings of friends, and whether life experience has convinced these two brains that what theyâre looking at is attractive. She just might sidle over to Mr. Wrong and bat her eyes. And he could well give in to temptation.
And so the dance of attraction, infatuation and ultimately love begins.
Itâs a dance that holds many mysteries, to psychologists as well as to the willing participants. Science is just beginning to parse the inner workings of the brain in love, examining the blissful or ruinous fall from a medley of perspectives: neural systems, chemical messengers and the biology of reward.
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 images they got are thought to be scienceâs first pictures of the brain in love.
The pictures were a revelation, and others have followed, showing that romantic love is a lot like addiction to alcohol or drugs. The brain is playing a trick, necessary for evolution, by associating something that just happened with pleasure and attributing the feeling to that magnificent specimen right before your eyes.
All animals mate: The most primitive system in the brain, one that even reptiles have, knows it needs to reproduce. Turtles do it but then lay their eggs in the sand and head back to sea, never seeing their mate again.
Human brains are considerably more complicated, with additional neural systems that seek romance, others that want comfort and companionship, and others that are just out for a roll in the hay.
Yet the chemistry between two people isnât just a matter of molecules careening around the brain, dictating feelings like some game of neuro-billiards. Attraction also involves personal history. âOur parents have an effect on us,â says Helen Fisher, evolutionary anthropologist at Rutgers University who studies human attraction. âSo does the school system, television, timing, mystery.â
Every book ever read, and every movie ever wept through, starts charting a course toward the chosen one.
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The love dance
âLove,â that one small word, stands for a hodgepodge of feelings and drives: lust, romance, passion, attachment, commitment and contentment. Studying this brew is made harder because the pathways arenât totally distinct. Lust and romance, for example, have some overlapping biology, even though they are not the same thing.
Similarly, the dance that leads, if weâre lucky, to a stable commitment moves through several key steps.
First comes initial attraction, the spark. If someoneâs going to pick one person out of the billions of opposite-sex humans out there, itâs this step that starts things rolling.
Next comes the wild, dizzying infatuation of romance -- a unique magic between two people who canât stop thinking about each other. The brain uses its chemical arsenal to focus our attention on one person, forsaking all others.
âEveryone knows what that feels like. This is one of the great mysteries. Itâs the love potion No. 9, the click factor, interpersonal chemistry,â says Gian Gonzaga, senior research scientist at eHarmony Labs.
The passion lasts for at least a few months, two to four years tops, says relationship researcher Arthur Aron, psychologist at the State University of New York at Stony Brook.
As it fades, something more stable takes over: the steady pair-bonding of whatâs called companionate love. Itâs a heartier variety, characterized by tenderness, affection and stability over the long haul. Far less is known about the brains of people celebrating their silver anniversaries or more, but researchers are beginning to recruit such couples to find out.
When Kelly and Robert Iblings of Calabasas had their first face-to-face meeting after a month of corresponding online, all signs of a spark were there. Kelly, 30, recalls thinking âWow!â Robert, 33, thought Kelly was beautiful. âI love his height,â Kelly says of Robertâs 6-foot-4 frame. âAnd those eyes. Heâs quite handsome. I mean, look at him. Heâs cute. Heâs hot.â
âSheâs very cute,â Robert says. âAnd I like the way she laughs.â
Their brainsâ signals were in sync, and it was good.
It probably didnât hurt that they were a little bit nervous about meeting each other.
For years, scientists have known that attraction is more likely to happen when people are aroused, be it through laughter, anxiety or fear. Aron tested that theory in 1974 on the gorgeous but spine-chilling heights of the Capilano Canyon Suspension Bridge in Vancouver, British Columbia -- a 5-foot wide, 450-foot, wobbly, swaying length of wooden slats and wire cable suspended 230 feet above rocks and shallow rapids.
His research team waited as unsuspecting men, between ages 18 and 35 and unaccompanied by women, crossed over. About halfway across the bridge, each man ran into an attractive young woman claiming to be doing research on beautiful places. She asked him a few questions and gave him her phone number in case he had follow-up questions.
The experiment was repeated upriver on a bridge that was wide and sturdy and only 10 feet above a small rivulet. The same attractive coed met the men, brandishing the same questionnaire.
The result? Men crossing the scary bridge rated the woman on the Capilano bridge more attractive. And about half the men who met her called her afterward. Only two of 16 men on the stable bridge called.
Fear got their attention and aroused emotional centers in the brain. âPeople are more likely to feel aroused in a scary setting,â Aron says. âItâs pretty simple. Youâre feeling physiologically aroused, and itâs ambiguous why. Then you see an attractive person, and you think, âOh, thatâs why.â â
In a laboratory, Aron tested his arousal theory further by having people run in place for 10 minutes, and compared them with people who didnât run. Those who had exercised were more attracted to good-looking people in photographs than those who had been sedentary.
Any kind of physiological arousal would probably do the trick, Aron concludes from his studies. Couples who ride roller coasters, laugh at a really funny comedian or escape a burning building together get an emotional jolt and could attribute the feeling to the attractiveness of the other.
The forces of attraction are in many ways mysterious, but scientists know certain things. Studies have shown that women prefer men with symmetrical faces and that men like a certain waist-to-hip ratio in their mates. One study even found that women, when they sniffed menâs T-shirts, were attracted to certain kinds of body odors.
That initial spark can flash and fade. Or it can become a flame and then a fire, a rush of exhilaration, yearning, hunger and sense of complete 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 their influence.
But passionate love is something far stronger than that first sizzle of chemistry. âItâs a drive to win lifeâs greatest prize, the right mating partner,â Fisher says. It is also, she adds, an addiction.
People in the early throes of passionate love, she says, can think of little else. They describe sleeplessness, loss of appetite, feelings of euphoria, and theyâre willing to take exceptional risks for the loved one.
Brain areas governing reward, craving, obsession, recklessness and habit all play their part in the trickery.
In an experiment published as a chapter in a 2006 book, âEvolutionary Cognitive Neuroscience,â Fisher found 17 people who were in relationships for an average of seven months. She knew they were in love from their answers to what researchers call the Passionate Love Scale. They all said theyâd feel deep despair if their lover left, and they yearned to know all there was to know about the loved one.
She put these lovesick, enraptured people in an fMRI to see what areas of their brains got active when they saw a photograph of their beloved ones.
âWe found some remarkable things,â she said. âWe saw activity in the ventral tegmental area and other regions of the brainâs reward system associated with motivation, elation and focused attention.â Itâs the same part of the brain that presumably is active when a smoker reaches for a cigarette or when gamblers think theyâre going to win the lottery. No wonder itâs as hard to say no to the feeling of romantic arousal as it would be to say no to a windfall in the millions. The brain has seen what it wants, and itâs going to get it.
âAt that point, you really wouldnât notice if he had three heads,â Fisher says. âOr youâd notice, but youâd choose to overlook it.â
Other studies also suggest that the brain in the first throes of love is much like a brain on drugs.
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. âThatâs the area thatâs also active when a cocaine addict gets an IV injection of cocaine,â Brown says. âItâs not a craving. Itâs a high.â
You see someone, you click, and youâre euphoric. And in response, your ventral tegmental area uses chemical messengers such as dopamine, serotonin and oxytocin to send signals racing to a part of the brain called the nucleus accumbens with the good news, telling it to start craving.
âThe other person becomes a goal in your life,â Brown says. He or she becomes a goal you might die without and would pack up and move across the country for. That one person begins to stand out as the one and only.
Biologically, the cravings and pleasure unleashed are as strong as any drug. Surely such a goal is worth taking risks for, and other alterations in the brain help ensure that the lovelorn will do just that. Certain regions, scientists have found, are being deactivated, such as within the amygdala, associated with fear. âThatâs why you can do such insane things when youâre in love,â Fisher says. âYou would never otherwise dream of driving across the country in 13 hours, but for love, you would.â
Sooner or later, 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% lower than normal people do -- just like people with obsessive-compulsive disorders.
Experiments in other mammals add to the human chemical findings. Female prairie voles, for example, develop a distinct preference for a specific male after mating, and the preference is associated with a 50% increase in dopamine in the nucleus accumbens.
But when the monogamous vole is injected with a dopamine antagonist, blocking the activity of the chemical, sheâll readily dump her partner for another.
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Using their heads
Kelly and Robert Iblings, now married for nine months, are fascinated by all this talk of nucleus accumbens, addiction and primitive mating instincts. Sure, they admit, they found each other attractive. But they were also making use of their front brainsâ sharp thinking skills. They were remembering painful past lessons and looking for signs of compatibility.
They had each survived an earlier, failed engagement, and they knew what they were looking for this time around. They were listening to their front brains as they told them to look for compatibility, stability, shared values and commitment.
From their first e-mail exchanges through eHarmony, an Internet dating service, the Iblings each felt they had found a unique mate. She liked to travel. So did he. They both love books and learning, have similar religious beliefs and come from loving, intact families. She no sooner sent an e-mail telling him about an exhibit she saw on a business trip to New York than he sent a message back telling her he knew of the exhibit because he had bought a book on it the day before.
Coincidence, or soul mate?
The front brain certainly gets involved as it ponders all of lifeâs experiences and past mistakes, researchers say -- but not just the front brain. The nucleus accumbens, virtual swamp of dopamine that it is, is also holder of memories. Its quest for reward is influenced by childhood experiences, friends, previous failed engagements or the jerk who cheated on you. The sum of those experiences make some people attracted to a prince or a frog, a princess or a shrew.
And, as it happens, practical matters such as whether a couple both like piña coladas and getting caught in the rain do matter in igniting passionate love.
A research project headed by eHarmony Labsâ Gonzaga interviewed 1,200 dating and newlywed couples. The results, reported in the July issue of the Journal of Personality and Social Psychology, found that those who reported similar interests and feelings were more satisfied. âThose who reported chemistry said they felt at ease, relaxed, connected. They knew they had some things in common,â he says. âChemistry is more than just being hot or handsome.â
Clearly, in the matters of love, the stars were aligned for the Iblings. When they met, they were ready for each other. But they were also attracted to each other. The chemistry was there. Most relationship researchers think it has to be.
They had what it took to kick-start the relationship with an undeniable urgency, allowing two people to give up the candy store of other choices and commit to each other.
Odds are that in two to four years, this urgency will fade -- and the couple will, if all goes well, settle in for the long haul with companionate love. Such peoplesâ lives are entwined, as are their property and bank accounts, and they begin to answer questionnaires differently. The rush and the urgency is gone, but they feel committed, emotionally close and stable.
It is the state that many desire, yet it is the least studied. Thereâs a reason for that. Most studies of couples are of college students and young newlyweds.
Brown, however, has recently recruited volunteers for a study of people 40 to 65 who have been together for many years. Sheâll put them in fMRIs to see where love resides after the urgency fades. âItâs unknown, the extent to which these original brain motivations are still active,â she says. âOr whether companionate love has turned more cortical, more conscious thinking, more evaluative.â Her first volunteers had their brains scanned this month.
The free fall of loveâs first rush can happen at any age, whether people are 20 or 70, says Elaine Hatfield, psychology professor at the University of Hawaii and relationship researcher.
What differs is that the older people get, the more memories they harbor of joy and trust, rejection and disappointment. And as people learn from experience, the front brain, with its logic and reason, probably gets a greater say.
âWhen you are young, passion and hope are so strong thatâs itâs almost impossible to stop loving someone,â Hatfield says. âAfter youâve been kicked around by life, however, you start to have a dual response to handsome con men: âWow!â and âArrrrrrgh!â
âIt takes not will power but painful experience to make us wise.â
Somehow, it all comes together, for better or for worse, the sum total of whatâs found in the mating dance of the ancient reptilian brain, the passion of the limbic brain and the logic of the neocortex.
Oh, what a ride.
susan.brink@latimes.com