Motherhood is thought to make women brighter, faster and more spatially aware. Now scientists believe that the birth of a baby also gives men a welcome boost
What transforms footloose, feckless men into switched-on, dedicated fathers? Science is starting to discover that, just as nature prepares women to be committed mums, it can also make dads’ brains significantly sharper and more empathetic. A study being presented next month to the Society for Neuroscience by researchers at Richmond University, Virginia, shows how hormone changes in motherhood seem to make women brighter, faster at solving problems and more spatially aware. But it’s not only mums’ minds that get chemically enhanced.
While the biology of fatherhood remains largely uncharted, a growing body of research shows how new dads undergo a series of hormonal changes that may boost their nurturing instincts, make them kinder, more concerned and attentive to the point of obsessiveness. And, because there’s usually a downside in nature, the changes may also induce phantom-pregnancy symptoms and attacks of the baby blues.
Fatherhood triggers hormonal changes
In a surprising series of tests by Canadian scientists, up to 90 per cent of dads have reported pregnancy-like symptoms such as nausea, cravings and weight gain. Anne Storey, of Memorial University, Newfoundland, analysed 31 expectant men’s blood and found that those with phantom-pregnancy symptoms had significantly raised levels of the hormone prolactin, which is named for its role in promoting lactation in women. It also prompts animals to build nests. Storey reports in the journal Evolution and Human Behavior how she also found that the boisterous male hormone, testosterone, falls in new and expectant fathers by as much as 33 per cent. It also decreases in response to an infant’s cries and when men comfort their own child. The reduction, she suggests, may serve to encourage fathers to relate, rather than compete, with their children.
Men become more alert to a child’s needs
The two hormones may boost male empathy in other ways. Research by the Toronto University researcher Alison Fleming shows that men with high prolactin levels are more alert to a baby’s cry. Fleming has also found that new fathers with lowered testosterone levels feel more of a need to respond to their infants’ bawling. The characteristically calming female hormone, oestrogen, plays a part, too, according to a report in the journal Mayo Clinic Proceedings. It reports that new fathers have higher levels than other men.
“The evidence suggests there is a biology of fatherhood,” says Barry Hewlett, an American anthropologist who has studied Aka hunter-gatherers in Central Africa for three decades and considers them hugely attentive fathers. Aka men spend almost half their time either holding their babies or being within reach of them. They let their offspring suck their nipples for comfort, Hewlett says.
But they’re not just the tribal equivalent of metrosexual dads competing to know most about baby slings - Aka men take their babies with them when they go out to drink palm wine with their pals.
“They have their babies, but they are talking guy talk. It’s amazing to watch,” says Hewlett, whose Aka studies sparked his interest in the role of hormones in fatherhood. He ran a study in the United States that took blood samples from fathers before they held their infants, and again after they had them on their chests for 15 minutes. Their prolactin levels went up.
They feel a real sense of responsibility
Jack O’Sullivan, the author of the BBC Guide To Fatherhood and He’s Having A Baby, says his own experience and his discussions with thousands of dads make him a firm believer in paternal brain-shaping: “There are definite changes. I suffered an attack of ‘provider fever’ both times my children were born. I suddenly experienced a real sense of responsibility, of needing to work at having a secure job and a supportive income.” O’Sullivan, who founded the pressure group, Fathers Direct, adds: “These are instinctive feelings. I think that new dads should listen to those instincts, rather than be told by many parenting books that they don’t actually know anything about childcare.”
But what sets off these hormonal changes? Here the research is scant, but two mechanisms may be responsible: the first is the environmental fact that men are meeting a new range of social expectations that can alter their brain functioning. The second agent is pheromones: the chemical messengers that all animals emit.
But it’s not all good news
Classic studies show that women living together in dormitories have their menstruation cycles synchronised through pheromones. Similarly, a man and a woman who share intimate space may communicate chemical messages that cue a man to start getting parental. Certainly, men’s brain-patterns do change. James Swain, a researcher at Yale University, used an fMRI scanner to examine 25 new dads’ heads when they heard their infant crying or viewed a picture of their newborn. The scans showed activity strikingly similar to that seen in patients with obsessive-compulsive disorder symptoms.
New dads aren’t mentally ill, but they do tend to fuss - often on typically male matters such as whether the car seat is strapped exactly right. Over-attentiveness can be one problem - and postnatal depression is another.
The Adelaide University researcher, Karina Bria, says about 10 per cent of fathers develop the disorder. “Many don’t acknowledge it,” says Bria, who has conducted a national study on depression in first-time fathers. One man who isn’t in denial, though, is Will Courtenay, a San Francisco psychotherapist who has launched Saddaddy.com after suffering the disorder following his son’s birth in June. “These hormones coursing through our bodies can really wreak havoc on a man’s functioning,” he says.
As far as Mother Nature is concerned that’s small price to pay for turning millions of men into smart, caring parental partners. (…)
Source: Times Online, UK
http://women.timesonline.co.uk/tol/life_and_style/women/families/article4962480.ece