In the U.S., couples with daughters are somewhat more likely to divorce than couples with sons. Many scholars have read those numbers as evidence that daughters cause divorce. […]

Previous studies have argued that fathers prefer boys and are more likely to stay in marriages that produce sons. Conversely, the argument runs, men are more likely to leave a marriage that produces daughters. That scholarly claim has been around for decades, and has gained a following in popular culture. […]

A new research from Duke University suggests something quite different may be at play. […] Throughout the life course, girls and women are generally hardier than boys and men. At every age from birth to age 100, boys and men die in greater proportions than girls and women. Epidemiological evidence also suggests that the female survival advantage actually begins in utero. These more robust female embryos may be better able to withstand stresses to pregnancy, the new paper argues, including stresses caused by relationship conflict.

Based on an analysis of longitudinal data from a nationally representative sample of U.S. residents from 1979 to 2010, Hamoudi and Nobles say a couple’s level of relationship conflict predicts their likelihood of subsequent divorce.

Strikingly, the authors also found that a couple’s level of relationship conflict at a given time also predicted the sex of children born to that couple at later points in time. Women who reported higher levels of marital conflict were more likely in subsequent years to give birth to girls, rather than boys.

{ EurekAlert | Continue reading }

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This study compared the effectiveness of four classic moral stories in promoting honesty in 3- to 7-year-olds. Surprisingly, the stories of “Pinocchio” and “The Boy Who Cried Wolf” failed to reduce lying in children. In contrast, the apocryphal story of “George Washington and the Cherry Tree” significantly increased truth telling. Further results suggest that the reason for the difference in honesty-promoting effectiveness between the “George Washington” story and the other stories was that the former emphasizes the positive consequences of honesty, whereas the latter focus on the negative consequences of dishonesty.

{ Psychological Science | PDF }

art { Sara Cwynar, Print Test Panel (Darkroom Manuals), 2013 }

Does Having Daughters Cause Judges to Rule for Women’s Issues?

Using new data on the family lives of U.S. Courts of Appeals judges, we find that, conditional on the number of children a judge has, judges with daughters consistently vote in a more feminist fashion on gender issues than judges who have only sons. This result survives a number of robustness tests and appears to be driven primarily by Republican judges. More broadly, this result demonstrates that personal experiences influence how judges make decisions, and this is the first article to show that empathy may indeed be a component in how judges decide cases.

{ American Journal of Political Science | Continue reading }

{ Effect of a clown’s presence at botulinum toxin injections in children }

{ Chino Otsuka superimposes her adult self into childhood photos }

Childhood amnesia kicks in around age 7

You could travel the world with an infant aged under 3 and it’s almost guaranteed that when they get older they won’t remember a single boat trip, plane ride or sunset. This is a phenomenon known as childhood or infantile amnesia, that means most of us lose all our earliest autobiographical memories. It’s a psychological conundrum because when they are 3 or younger, kids are able to discuss autobiographical events from their past. So it’s not that memories from before age 3 never existed, it’s that they are subsequently forgotten. […]

Bauer and Larkina uncovered a paradox - at ages 5 to 7, the children remembered over 60 per cent of the events they’d chatted about at age 3. […] In contrast, children aged 8 and 9 recalled fewer than 40 per cent of the events they’d discussed at age 3, but those memories they did recall were more adult-like in their content.

{ BPS | Continue reading }

Humans show a natural tendency to discount bad news while incorporating good news into beliefs (the “good news–bad news effect”), an effect that may help explain seemingly irrational risk taking. Understanding how this bias develops with age is important because adolescents are prone to engage in risky behavior; thus, educating them about danger is crucial.

We reveal a striking valence-dependent asymmetry in how belief updating develops with age. In the ages tested (9–26 y), younger age was associated with inaccurate updating of beliefs in response to undesirable in- formation regarding vulnerability. In contrast, the ability to update beliefs accurately in response to desirable information remained relatively stable with age. This asymmetry was mediated by adequate computational use of positive but not negative estimation errors to alter beliefs.

The results are important for understanding how belief formation develops and might help explain why adolescents do not respond adequately to warnings.

{ PNAS | PDF }

Teenagers’ brains are wired to confront a threat instead of retreating, research suggests. The results may help explain why criminal activity peaks during adolescence.

{ Science News | Continue reading }

An eye-opening 2005 paper estimated the number of children who are not the biological offspring of their presumed father.

Looking at studies from around the world, it concluded that the median number of kids who are not the children of the person they call ‘dad’ is 3.7% with studies typically finding a rate of between two and ten percent.

This is presumably due to children being conceived during clandestine affairs.

{ Mind Hacks | Continue reading }

{ You need to see this 17-minute film set entirely on a teen’s computer screen | thanks Stella }

By about 1900, the need for child labour had declined, so children had a good deal of free time. But then, beginning around 1960 or a little before, adults began chipping away at that freedom by increasing the time that children had to spend at schoolwork and, even more significantly, by reducing children’s freedom to play on their own, even when they were out of school and not doing homework. Adult-directed sports for children began to replace ‘pickup’ games; adult-directed classes out of school began to replace hobbies; and parents’ fears led them, ever more, to forbid children from going out to play with other kids, away from home, unsupervised. There are lots of reasons for these changes but the effect, over the decades, has been a continuous and ultimately dramatic decline in children’s opportunities to play and explore in their own chosen ways.

Over the same decades that children’s play has been declining, childhood mental disorders have been increasing.

{ Aeon | Continue reading }

Back in 1978, the Chinese politburo enacted the “one-child policy”, whose main purpose was to “alleviate social, economic, and environmental problems” in China as a result of the soaring population. According to estimates, the policy prevented more than 250 million births between 1980 and 2000, and 400 million births from about 1979 to 2011. And while not applicable to everyone, in 2007 approximately 35.9% of China’s population was subject to a one-child restriction.

Regardless of the numbers, things are about to change: with the Chinese economy now having peaked and suddenly finding itself in rapid deceleration with excess credit growth providing virtually no boost to marginal growth, the Chinese government is forced to reexamine 35 years of social policy in order to extract growth from the one place where for nearly 4 decades it had tried to stifle: demographics. 

According to the 21st Business Herald which cited sources close to the National Population and Family Planning Commission, China may relax its one-child policy at end-2013 or early-2014 (read end) by allowing families to have two children if at least one parent is from a one-child family. A plan for allowing all families to have two children after 2015 is also being reviewed.

{ ZeroHedge | Continue reading }

When she became pregnant, Ms. Martin called her local hospital inquiring about the price of maternity care; the finance office at first said it did not know, and then gave her a range of $4,000 to $45,000. […]

Like Ms. Martin, plenty of other pregnant women are getting sticker shock in the United States, where charges for delivery have about tripled since 1996, according to an analysis done for The New York Times by Truven Health Analytics. Childbirth in the United States is uniquely expensive, and maternity and newborn care constitute the single biggest category of hospital payouts for most commercial insurers and state Medicaid programs. […]

The average total price charged for pregnancy and newborn care was about $30,000 for a vaginal delivery and $50,000 for a C-section, with commercial insurers paying out an average of $18,329 and $27,866, the report found. […]

Two decades ago, women typically paid nothing other than a small fee if they opted for a private hospital room or television.

{ NY Times | Continue reading }

Did you know Disney created its own confetti called ‘Flutterfetti,’ which was actually engineered to ‘flutter’ in the air better? Or that the parks will pump out a vanilla scent on Main Street because the smell triggers fond memories?

{ The Credits | Continue reading }

Nearly one in five high school age boys in the United States and 11 percent of school-age children over all have received a medical diagnosis of attention deficit hyperactivity disorder.

These rates reflect a marked rise over the last decade and could fuel growing concern among many doctors that the A.D.H.D. diagnosis and its medication are overused in American children. […]

About two-thirds of those with a current diagnosis receive prescriptions for stimulants like Ritalin or Adderall, which can drastically improve the lives of those with A.D.H.D. but can also lead to addiction, anxiety and occasionally psychosis. […]

More teenagers are likely to be prescribed medication in the near future because the American Psychological Association plans to change the definition of A.D.H.D. to allow more people to receive the diagnosis and treatment. A.D.H.D. is described by most experts as resulting from abnormal chemical levels in the brain that impair a person’s impulse control and attention skills. […]

A.D.H.D. has historically been estimated to affect 3 to 7 percent of children. The disorder has no definitive test and is determined only by speaking extensively with patients, parents and teachers, and ruling out other possible causes — a subjective process that is often skipped under time constraints and pressure from parents. It is considered a chronic condition that is often carried into adulthood. […]

Fifteen percent of school-age boys have received an A.D.H.D. diagnosis, the data showed; the rate for girls was 7 percent. Diagnoses among those of high-school age — 14 to 17 — were particularly high, 10 percent for girls and 19 percent for boys. […]

The medications — primarily Adderall, Ritalin, Concerta and Vyvanse — often afford those with severe A.D.H.D. the concentration and impulse control to lead relatively normal lives. Because the pills can vastly improve focus and drive among those with perhaps only traces of the disorder, an A.D.H.D. diagnosis has become a popular shortcut to better grades, some experts said, with many students unaware of or disregarding the medication’s health risks.

{ NY Times | Continue reading }

photo { Loretta Lux }

The decline of two-parent households may be a significant reason for the divergent fortunes of male workers, whose earnings generally declined in recent decades, and female workers, whose earnings generally increased, a prominent labor economist argues in a new survey of existing research. […]

Only 63 percent of children lived in a household with two parents in 2010, down from 82 percent in 1970. The single parents raising the rest of those children are predominantly female. And there is growing evidence that sons raised by single mothers “appear to fare particularly poorly,” Professor Autor wrote in an analysis for Third Way, a center-left policy research organization. […]

Men who are less successful are less attractive as partners, so women are choosing to raise children by themselves, producing sons who are less successful and attractive as partners. […]

“I think the greatest, most astonishing fact that I am aware of in social science right now is that women have been able to hear the labor market screaming out ‘You need more education’ and have been able to respond to that, and men have not,” said Michael Greenstone, an M.I.T. economics professor. […]

Professor Autor said in an interview that he was intrigued by evidence suggesting the consequences were larger for boys than girls, including one study finding that single mothers spent an hour less per week with their sons than their daughters. Another study of households where the father had less education, or was absent entirely, found the female children were 10 to 14 percent more likely to complete college. A third study of single-parent homes found boys were less likely than girls to enroll in college. […]

Instead of making marriage more attractive, he said, it might be better for society to help make men more attractive.

{ NY Times | Continue reading }

What your mother ate around your conception could have affected your genes, or at least how they function, by switching certain genes on and off through DNA methylation. […]

People in rural parts of the Gambia have dramatic seasonal changes in their diet, because crops are planted at the beginning of the rainy season and harvested at the end, as there is no irrigation the rest of the year. […]

In a paper published in PLoS Genetics, the children conceived in August and September, the peak of the rainy season when nutrition is poor, had higher levels of DNA methylation in five genes, which surprised the researchers, as they had expected lower levels. These included the SLITRK1 gene associated with Tourette’s syndrome, and the PAX8 gene linked to hypothyroidism.

{ Genome Engineering | Continue reading }

photo { Marianna Rothen }

Michael Kearney, a former child prodigy, was homeschooled by his parents. He was diagnosed with ADHD and his parents declined to use the offered prescription of Ritalin. His younger sister, Maeghan, is also a child prodigy.

He spoke his first words at four months. At the age of six months, he said to his pediatrician “I have a left ear infection” and learned to read at the age of ten months. When Michael was four, he was given multiple-choice diagnostic tests for the Johns Hopkins precocious math program. Without having studied specifically for the exam, Michael achieved a perfect score.

He attended San Marin High School in Novato, California, for one year, graduating at the age of six in 1990. He enrolled at Santa Rosa Junior College in Sonoma County, California, graduating at age 8 with an Associate of Science in Geology. He is listed in the Guinness Book as the world’s youngest university graduate at the age of ten, receiving a bachelor’s degree in anthropology from the University of South Alabama.

{ Wikipedia | Continue reading }

Faces are important for non-verbal communication in daily life, and eye gaze direction provides important information for adult–infant interaction. Four-month-old infants and adults better recognize faces when accompanied with direct gaze, suggesting a special status of ‘eye contact.’ Whether mutual gaze plays a role in face recognition from birth, or whether it requires expertise, is investigated in this paper. We conducted a between subjects design, for a total of four experiments, […] to investigate newborns’ ability to recognize faces when gaze direction is manipulated. We predicted that a face accompanied with direct gaze would be better recognized by newborns. In contrast, we expected no evidence of identity recognition when newborns were familiarized with a face with averted gaze. According with our expectations, newborns were able to recognize a face identity when previously familiarized with direct gaze, but not with averted gaze. However, this effect was face identity-specific. Overall, our results suggest that direct gaze can modulate face processing and affects preferences and face identity learning in newborns.

{ Infant and Child Development | PDF }

oil on canvas { Mark Ryden }