Employers Must Offer Family Health Care, Affordable or Not, Administration Says

WASHINGTON — In a long-awaited interpretation of the new health care law, the Obama administration said Monday that employers must offer health insurance to employees and their children, but will not be subject to any penalties if family coverage is unaffordable to workers.

The requirement for employers to provide health benefits to employees is a cornerstone of the new law, but the new rules proposed by the Internal Revenue Service said that employers’ obligation was to provide affordable insurance to cover their full-time employees. The rules offer no guarantee of affordable insurance for a worker’s children or spouse. To avoid a possible tax penalty, the government said, employers with 50 or more full-time employees must offer affordable coverage to those employees. But, it said, the meaning of “affordable” depends entirely on the cost of individual coverage for the employee, what the worker would pay for “self-only coverage.”

The new rules, to be published in the Federal Register, create a strong incentive for employers to put money into insurance for their employees rather than dependents. It is unclear whether the spouse and children of an employee will be able to obtain federal subsidies to help them buy coverage — separate from the employee — through insurance exchanges being established in every state. The administration explicitly reserved judgment on that question, which could affect millions of people in families with low and moderate incomes.

Many employers provide family coverage to full-time employees, but many do not. Family coverage is much more expensive, and the employee’s share of the premium is typically much larger.

In 2012, according to an annual survey by the Kaiser Family Foundation, premiums for employer-sponsored health insurance averaged $5,615 a year for single coverage and $15,745 for family coverage. The employee’s share of the premium averaged $951 for individual coverage and more than four times as much, $4,316, for family coverage.

Starting in 2014, most Americans will be required to have health insurance. Low- and middle-income people can get tax credits to help pay their premiums, unless they have access to affordable coverage from an employer.

In its proposal, the Internal Revenue Service said, “Coverage for an employee under an employer-sponsored plan is affordable if the employee’s required contribution for self-only coverage does not exceed 9.5 percent of the employee’s household income.”

The rules, though labeled a proposal, are more significant than most proposed regulations. The Internal Revenue Service said employers could rely on them in making plans for 2014.

In writing the law, members of Congress often conjured up a picture of employees working year-round at full-time jobs. But in drafting the rules, the I.R.S. wrestled with the complex reality of part-time, seasonal and temporary workers.

In addition, the administration expressed concern that some employers might try to evade the new requirements by firing and rehiring employees, manipulating their work hours or using temporary staffing agencies. The rules include several provisions to prevent such abuse.

The law says an employer with 50 or more full-time employees may be subject to a tax penalty if it fails to offer coverage to “its full-time employees (and their dependents).”

Employers asked for guidance, and the Obama administration provided it, saying that a dependent is an employee’s child under the age of 26.

“Dependent does not include the spouse of an employee,” the proposed rules say.

Thus, employers must offer coverage to children of an employee, but do not have to make it affordable. And they do not have to offer coverage at all to the spouse of an employee.

The administration said that the rules — which apply to private businesses, nonprofit organizations and state and local government agencies — would require changes at many work sites.

“A number of employers currently offer coverage only to their employees, and not to dependents,” the I.R.S. said. “For these employers, expanding their health plans to add dependent coverage will require substantial revisions to their plans.”

In view of this challenge, the agency said it would grant a one-time reprieve to employers who fail to offer coverage to dependents of full-time employees, provided they take steps in 2014 to come into compliance. Under the rules, employers must offer coverage to employees in 2014 and must offer coverage to dependents as well, starting in 2015.

The new rules apply to employers that have at least 50 full-time employees or an equivalent combination of full-time and part-time employees. A full-time employee is a person employed on average at least 30 hours a week. And 100 half-time employees are considered equivalent to 50 full-time employees.

Thus, the government said, an employer will be subject to the new requirement if it has 40 full-time employees working 30 hours a week and 20 half-time employees working 15 hours a week.

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Fiscal cliff deal won't help labor market, economists say

Lawmakers may have avoided another recession by coming to a last-minute deal on the so-called fiscal cliff, but they did little to boost the lackluster labor market, indicating job seekers may have a tough time finding work in the first half of 2013, economists say.

Congress did not postpone a scheduled increase in payroll taxes, which means that employed Americans will see less take home pay than they did last year. That means they'll spend less initially while they readjust their budgets to the new reality. Slowing consumer spending will create less demand for goods and services, so "businesses will see less of a need to hire,” said Michael Feroli, chief U.S. economist for JPMorgan Chase.

The Bureau of Labor Statistics will release job numbers for December on Friday, and economists expect those numbers to be decent, with businesses and government adding about 150,000 jobs. But that report may be the best for months as businesses pull back in January and in the first quarter of the year because of that reduced demand.

Mark Zandi of Moody’s estimates that the deal will result in about 600,000 fewer jobs created this year than would have been created had last year’s tax policies remained in place.

The cuts will slow consumption by about 1% for the year, said Michael Gapen, senior U.S. economist at Barclays in New York. But the biggest hits to the labor market may be in the first few months of the year, when businesses purge payrolls after the holiday season. They won't hire much in the first quarter because businesses will remain cautious, waiting for Congress to make more decisions about the budget and sequestration in March, he said. 

“The cautiousness on the part of businesses will persist,” he said.

On the other hand,  Congress did extend unemployment insurance benefits through 2013, which will keep some spending in the economy, as unemployed workers generally spend their benefits on essentials such as food and clothing. About 2 million workers would have lost jobless benefits this week had the program not been extended.

Some economists, such as Peter Morici, an economist at the University of Maryland, warn that higher taxes on small businesses, coupled with increasing costs from Obamacare, will drag down hiring significantly.

“Small businesses now have more certainty – the assurance of more burdensome regulations, healthcare costs and taxes, and this will burden growth,” he wrote.

But more economists are slightly more optimistic. They expect a slowdown in the labor market to last about three to six months, unless, of course, more uncertainty is created by negotiations in March. One thing is for sure, said Gapen -- the recession illuminated some big problems in American governance, and until those are resolved, the economy will likely limp along.

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Ruling over bumper-car injury supports amusement park

SAN FRANCISCO — The California Supreme Court, protecting providers of risky recreational activities from lawsuits, decided Monday that bumper car riders may not sue amusement parks over injuries stemming from the inherent nature of the attraction.

The 6-1 decision may be cited to curb liability for a wide variety of activities — such as jet skiing, ice skating and even participating in a fitness class, lawyers in the case said.

"This is a victory for anyone who likes fun and risk activities," said Jeffrey M. Lenkov, an attorney for Great America, which won the case.

But Mark D. Rosenberg, who represented a woman injured in a bumper car at the Bay Area amusement park, said the decision was bad for consumers.

"Patrons are less safe today than they were yesterday," Rosenberg said.

The ruling came in a lawsuit by Smriti Nalwa, who fractured her wrist in 2005 while riding in a bumper car with her 9-year-old son and being involved in a head-on collision. Rosenberg said Great America had told ride operators not to allow head-on collisions, but failed to ask patrons to avoid them.

The court said Nalwa's injury was caused by a collision with another bumper car, a normal part of the ride. To reduce all risk of injury, the ride would have to be scrapped or completely reconfigured, the court said.

"A small degree of risk inevitably accompanies the thrill of speeding through curves and loops, defying gravity or, in bumper cars, engaging in the mock violence of low-speed collisions," Justice Kathryn Mickle Werdegar wrote for the majority. "Those who voluntarily join in these activities also voluntarily take on their minor inherent risks."

Monday's decision extended a legal doctrine that has limited liability for risky sports, such as football, to now include recreational activities.

"Where the doctrine applies to a recreational activity," Werdegar wrote, "operators, instructors and participants …owe other participants only the duty not to act so as to increase the risk of injury over that inherent in the activity."

Amusement parks will continue to be required to use the utmost care on thrill rides such as roller coasters, where riders surrender control to the operator. But on attractions where riders have some control, the parks can be held liable only if their conduct unreasonably raised the dangers.

"Low-speed collisions between the padded, independently operated cars are inherent in — are the whole point of — a bumper car ride," Werdegar wrote.

Parks that fail to provide routine safety measures such as seat belts, adequate bumpers and speed controls might be held liable for an injury, but operators should not be expected to restrict where a bumper car is bumped, the court said.

The justices noted that the state inspected the Great America rides annually, and the maintenance and safety staff checked on the bumper cars the day Nalwa broke her wrist. The ride was functioning normally.

Reports showed that bumper car riders at the park suffered 55 injuries — including bruises, cuts, scrapes and strains — in 2004 and 2005, but Nalwa's injury was the only fracture. Nalwa said her wrist snapped when she tried to brace herself by putting her hand on the dashboard.

Rosenberg said the injury stemmed from the head-on collision. He said the company had configured bumper rides in other parks to avoid such collisions and made the Santa Clara ride uni-directional after the lawsuit was filed.

Justice Joyce L. Kennard dissented, complaining that the decision would saddle trial judges "with the unenviable task of determining the risks of harm that are inherent in a particular recreational activity."

"Whether the plaintiff knowingly assumed the risk of injury no longer matters," Kennard said.

maura.dolan@latimes.com

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No surprise: YouTube, Angry Birds, Instagram and Facebook among 2012′s top apps

Title Post: No surprise: YouTube, Angry Birds, Instagram and Facebook among 2012′s top apps
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Pasadena's Rose Parade kicks off on a cold morning

PASADENA, Calif. (AP) — The 124th Rose Parade in Pasadena kicked off on a chilly New Year's morning with the theme "Oh the Places You'll Go!" named in honor of the Dr. Seuss book.

Led by this year's grand marshal, British primatologist Jane Goodall, the parade features 42 floats covered with flowers and plant material, 23 marching bands and 21 equestrian units from across the country.

An estimated 700,000 spectators are lining the streets to view the 5-mile-long spectacle, which is broadcast around the world. This year's parade features the first-ever float entered by the Defense Department and a couple getting married on a float.

The $247,000 military float is a replica of the Korean War Veterans Memorial in Washington to commemorate the veterans from that conflict.

The float that scooped up the parade's grand "Sweepstakes" prize for the most beautiful floral presentation and design was "Dreaming in Paradise" by fruit and vegetable producer Dole.

Die-hard parade fans staked out their spots early Monday with folding chairs, hammocks and portable barbeque grills.

They brought in the new year by throwing marshmallows, shaving cream and tortillas, and then hunkered down to stay warm in sleeping bags during a particularly cold night for Southern California.

The wave of under-40-degree temperature spurred a number of cold-weather exposure calls to emergency personnel, police department spokeswoman Lisa Derderian told City News Service.

As of 8 a.m. Tuesday, police had made a total of 22 arrests along the parade route since 6 p.m. Monday, said police Lt. Rick Aversan.

All but one arrest were for public intoxication. The other was for possession of burglary tools that could have been used to break into cars, police said.

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Hispanic Pregnancies Fall in U.S. as Women Choose Smaller Families

ORLANDO, Fla. — Hispanic women in the United States, who have generally had the highest fertility rates in the country, are choosing to have fewer children. Both immigrant and native-born Latinas had steeper birthrate declines from 2007 to 2010 than other groups, including non-Hispanic whites, blacks and Asians, a drop some demographers and sociologists attribute to changes in the views of many Hispanic women about motherhood.

As a result, in 2011, the American birthrate hit a record low, with 63 births per 1,000 women ages 15 to 44, led by the decline in births to immigrant women. The national birthrate is now about half what it was during the baby boom years, when it peaked in 1957 at 122.7 births per 1,000 women of childbearing age.

The decline in birthrates was steepest among Mexican-American women and women who immigrated from Mexico, at 25.7 percent. This has reversed a trend in which immigrant mothers accounted for a rising share of births in the United States, according to a recent report by the Pew Research Center. In 2010, birthrates among all Hispanics reached their lowest level in 20 years, the center found.

The sudden drop-off, which coincided with the onset of the recession, suggests that attitudes have changed since the days when older generations of Latinos prized large families and more closely followed Roman Catholic teachings, which forbid artificial contraception.

Interviews with young Latinas, as well as reproductive health experts, show that the reasons for deciding to have fewer children are many, involving greater access to information about contraceptives and women’s health, as well as higher education.

When Marucci Guzman decided to marry Tom Beard here seven years ago, the idea of having a large family — a Guzman tradition back in Puerto Rico — was out of the question.

“We thought one, maybe two,” said Ms. Guzman Beard, who gave birth to a daughter, Attalai, four years ago.

Asked whether Attalai might ever get her wish for a little brother or sister, Ms. Guzman Beard, 29, a vice president at a public service organization, said: “I want to go to law school. I’m married. I work. When do I have time?”

The decisions were not made in a vacuum but amid a sputtering economy, which, interviewees said, weighed heavily on their minds.

Latinos suffered larger percentage declines in household wealth than white, black or Asian households from 2005 to 2009, and, according to the Pew report, their rates of poverty and unemployment also grew more sharply after the recession began.

Prolonged recessions do produce dips in the birthrate, but a drop as large as Latinos have experienced is atypical, said William H. Frey, a sociologist and demographer at the Brookings Institution. “It is surprising,” Mr. Frey said. “When you hear about a decrease in the birthrate, you don’t expect Latinos to be at the forefront of the trend.”

D’Vera Cohn, a senior writer at the Pew Research Center and an author of the report, said that in past recessions, when overall fertility dipped, “it bounced back over time when the economy got better.”

“If history repeats itself, that will happen again,” she said.

But to Mr. Frey, the decrease has signaled much about the aspirations of young Latinos to become full and permanent members of the upwardly mobile middle class, despite the challenges posed by the struggling economy.

Jersey Garcia, a 37-year-old public health worker in Miami, is in the first generation of her family to live permanently outside of the Dominican Republic, where her maternal and paternal grandmothers had a total of 27 children.

“I have two right now,” Ms. Garcia said. “It’s just a good number that I can handle.”

“Before, I probably would have been pressured to have more,” she added. “I think living in the United States, I don’t have family members close by to help me, and it takes a village to raise a child. So the feeling is, keep what you have right now.”

But that has not been easy. Even with health insurance, Ms. Garcia’s preferred method of long-term birth control, an IUD, has been unaffordable. Birth control pills, too, with a $50 co-payment a month, were too costly for her budget. “I couldn’t afford it,” she said. “So what I’ve been doing is condoms.”

According to research by the National Latina Institute for Reproductive Health, the overwhelming majority of Latinas have used contraception at some point in their lives, but they face economic barriers to consistent use. As a consequence, Latinas still experience unintended pregnancy at a rate higher than non-Hispanic whites, according to the institute.

And while the share of births to teenage mothers has dropped over the past two decades for all women, the highest share of births to teenage mothers is among native-born Hispanics.

“There are still a lot of barriers to information and access to contraception that exist,” said Jessica Gonzáles-Rojas, 36, the executive director of the institute, who has one son. “We still need to do a lot of work.”

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Optimistic stock investors reaped rewards worldwide in 2012

Wall Street closed out the year with a surge in the final trading session, betting on a last-minute resolution of the so-called fiscal cliff.

The market may have jumped the gun, but investors' hopefulness fit the pattern of 2012: It was a year of solid stock price gains worldwide, as various predictions of Armageddon fell flat.

That has reinforced many market pros' conventional cautious optimism as the new year begins. Bears can still find plenty to be dour about, but the bulls have called it right in three of the last four years since the 2008 financial-system crash.

On Monday, the Dow Jones industrial average jumped 166 points, or 1.3%, to end the year at 13,104. Stocks rallied late in the session as rumors spread that Congress would approve a deal to limit the tax increases and spending cuts otherwise set to kick in Tuesday.

But after the closing bell, a deal to avert the fiscal cliff appeared uncertain — raising fears of a blistering market sell-off Wednesday.

Still, investors who had expected a sustained slump in stocks in 2012 found themselves left behind as most world markets posted double-digit percentage gains, underpinned by a resilient U.S. economy and by central banks' efforts to keep interest rates at rock bottom.

Wall Street optimism about 2013 remains rooted in expectations that the U.S. economy will continue to expand, albeit slowly, and with it corporate earnings.

"Absent a complete failure from Washington, growth should remain positive," said Russ Koesterich, global chief investment strategist at money management giant BlackRock Inc. in New York.

That bet paid off in 2012: The Standard & Poor's 500 index, a popular benchmark for many Americans' retirement accounts, rose 1.7% to 1,426 on Monday and was up 13.4% for the year.

That was the biggest advance since the index rose 23.4% in 2009. Stocks' gains last year also beat returns on most kinds of bonds and on low-yielding short-term cash accounts.

The S&P index now has rebounded 111% from its decade low in March 2009, restoring most of the wealth lost by investors in the Great Recession — if they held on.

In Europe, the Stoxx index of 600 big-name shares rose 14.4% for the year, also the biggest rally since 2009. Japan's main market index soared 22.9%. Most so-called emerging markets also were up sharply, including those in India, Mexico and Turkey.

The 30-stock Dow index was a relative laggard, rising 7.3% for the year. It was hurt by weakness in major energy stocks as crude oil prices fell and by a collapse of shares of troubled tech giant Hewlett-Packard Co.

Markets worldwide had rallied in the first few months of 2012, then dived in spring as doubts multiplied about the global economy.

Europe, gripped for a third year by its government-debt crisis, was the epicenter of those fears: Many investors expected the Eurozone to finally break up under its debt strains, consigning Greece, Spain, Portugal and perhaps other nations to economic death spirals.

But the doomsday predictions were thwarted by the European Central Bank. In late July, ECB President Mario Draghi shocked markets by declaring that the central bank would do whatever was necessary to preserve the Eurozone. "And believe me, it will be enough," Draghi said.

The ECB followed that pledge with a commitment to buy unlimited sums of Eurozone governments' bonds, if necessary, to pull down countries' borrowing costs — similar to the U.S. Federal Reserve's ongoing program of buying Treasury debt.

The ECB's move sparked a sharp rally in the euro that buoyed confidence in European stocks as well, despite deep recessions in the Continent's hardest-hit economies.

The U.S. economy, meanwhile, confounded expectations that it would slide back into recession. The economy grew at a 3.1% annualized rate in the third quarter after slowing to a 1.3% rate in the second quarter. Growth was supported in part by the housing market's continuing rebound.

"Housing got us into this mess. Now it's one of the sectors to get us out," said Sam Stovall, chief investment strategist at S&P Capital IQ in New York.

Housing-related stocks were some of the year's biggest winners, with builder PulteGroup Inc. up 188%, appliance maker Whirlpool Corp. rising 114% and paint producer Sherwin-Williams Co. up 72%.

Worldwide, investors' confidence also benefited as worries dissipated about a war between Israel and Iran. And late in the year, hopes rose that China's slowing economy would avoid a so-called hard landing — which could have put it in a recession — and instead would help drive global growth in the new year. The Shanghai stock market rocketed nearly 15% in December alone.

Emerging markets such as China could be a big lure for global investors in 2013, some experts said. Many governments in those markets have more leeway than developed economies to bolster growth with fiscal stimulus measures and with lower interest rates, said Jack Ablin, chief investment officer at BMO Private Bank in Chicago.

By contrast, Ablin worries that U.S. economic growth and corporate earnings growth will be much slower than many investors are anticipating in the new year.

Whatever the ultimate workout of the fiscal cliff, Ablin said, "We are going to see taxes go up incrementally and spending go down incrementally," weighing on the economy.

Market pessimists believe that stock markets since 2009 have been driven largely by cheap credit supplied by central banks, particularly the Federal Reserve. Critics say the Fed's latest decision to ramp up purchases of Treasury bonds, aimed at pumping more money into the economy, smacks of desperation.

Fed Chairman Ben S. Bernanke, however, has insisted that the Fed still has plenty of tools left to help the U.S. recovery gain speed. Wall Street, by and large, believes Bernanke.

"If they can print money," Stovall said, "are the central banks ever really out of bullets?"

business@latimes.com

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With clock ticking, still no deal to avert 'fiscal cliff'

Efforts to save the nation from going over a year-end "fiscal cliff" are still in disarray as lawmakers continue negotiations to confront the tax-and-spend crisis.

WASHINGTON – Senate leaders remain shy of a deal to avert the automatic tax increases due to take effect at midnight on New Year’s Eve, despite conversations that continued overnight between Vice President Joe Biden and Senate Republican Leader Mitch McConnell (R-Ky.).

Majority Leader Harry Reid (D-Nev.) said on the Senate floor Monday morning that “there are a number of issues in which the two sides are still apart” but that negotiations “are continuing as I speak.”

“We really are running out of time,” he added, about 13 hours before the nation would go over the so-called “fiscal cliff.”

Biden and McConnell, after trading phone calls Sunday afternoon, spoke again at 12:45 a.m. and again at 6:30 a.m. Monday. Biden’s role in the negotiations emerged on Sunday as McConnell, his former colleague of two decades in the Senate, appealed for a “dance partner” in his effort to find a workable solution on tax rates.

QUIZ: How much do you know about the fiscal cliff?

Republicans have said they are willing to raise taxes on wealthier households while stopping the tax increases for most Americans. But one of the sticking points remains the threshold at which current tax rates would be maintained. On Sunday, Republicans suggested taxing income of more than $550,000 for couples, while Democrats set their latest offer at $450,000.

Despite Biden’s lead role, there’s no guarantee any solution would meet with Democratic’ support. Sen. Tom Harkin of Iowa said Monday that he was concerned about the reported details of the deal, indicating that he believed it was preferable to see all tax rates revert to Clinton-era levels.

“I ask, what’s so bad about that?” he said on the Senate floor, noting the economic boom of the 1990s at those tax rates. “As I see this thing developing … no deal is better than a bad deal. And this looks like a very bad deal.”

Sen. Barbara Boxer (D-Calif.), who has supported a higher tax threshold, was more cautious. “One party doesn’t control everything. So we are going to have to meet somewhere in the middle,” she said.

The House was set to hold unrelated votes Monday afternoon but would be ready to vote if the Senate acts. The House Rules Committee waived the Republicans’ 72-hour rule, allowing the chamber to vote on legislation introduced the same day.

PHOTOS: Notable moments of the 2012 presidential election

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michael.memoli@latimes.com

Twitter: @mikememoli

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Kanye West, Kim Kardashian expecting 1st child

ATLANTIC CITY, N.J. (AP) — A kid for Kimye: Kanye West and Kim Kardashian are expecting their first child.

The rapper announced at a concert Sunday night that his girlfriend is pregnant. Kardashian was in the crowd at Revel Resort's Ovation Hall with her mother, Kris Jenner, and West's mentor and best friend, Jay-Z. West told the crowd of more than 5,000 in song form: "Now you having my baby."

The crowd roared. And so did people on the Internet.

The news instantly went viral on Twitter and Facebook, with thousands posting and commenting on the expecting couple.

Most of the Kardashian clan also tweeted about the news, including Kim's sisters. Kourtney Kardashian wrote: "Another angel to welcome to our family. Overwhelmed with excitement!"

West, 35, also told concertgoers to congratulate his "baby mom" and that this was the "most amazing thing."

Representatives for West and Kardashian, 32, didn't immediately respond to emails about the pregnancy.

The rapper and reality TV star went public in March.

Kardashian married NBA player Kris Humphries in August 2011 and their divorce is not finalized.

West's Sunday-night show was his third consecutive performance at Revel. He took the stage for nearly two hours, performing hits like "Good Life," ''Jesus Walks" and "Clique" in an all-white ensemble with two bandmates.

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AP Writer Bianca Roach contributed to this report.

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Follow Mesfin Fekadu on Twitter at http://twitter.com/MusicMesfin . Follow Bianca Roach at http://twitter.com/B__Roach

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Well: Exercise and the Ever-Smarter Human Brain

Anyone whose resolve to exercise in 2013 is a bit shaky might want to consider an emerging scientific view of human evolution. It suggests that we are clever today in part because a million years ago, we could outrun and outwalk most other mammals over long distances. Our brains were shaped and sharpened by movement, the idea goes, and we continue to require regular physical activity in order for our brains to function optimally.

Phys Ed

Gretchen Reynolds on the science of fitness.

The role of physical endurance in shaping humankind has intrigued anthropologists and gripped the popular imagination for some time. In 2004, the evolutionary biologists Daniel E. Lieberman of Harvard and Dennis M. Bramble of the University of Utah published a seminal article in the journal Nature titled “Endurance Running and the Evolution of Homo,” in which they posited that our bipedal ancestors survived by becoming endurance athletes, able to bring down swifter prey through sheer doggedness, jogging and plodding along behind them until the animals dropped.

Endurance produced meals, which provided energy for mating, which meant that adept early joggers passed along their genes. In this way, natural selection drove early humans to become even more athletic, Dr. Lieberman and other scientists have written, their bodies developing longer legs, shorter toes, less hair and complicated inner-ear mechanisms to maintain balance and stability during upright ambulation. Movement shaped the human body.

But simultaneously, in a development that until recently many scientists viewed as unrelated, humans were becoming smarter. Their brains were increasing rapidly in size.

Today, humans have a brain that is about three times larger than would be expected, anthropologists say, given our species’ body size in comparison with that of other mammals.

To explain those outsized brains, evolutionary scientists have pointed to such occurrences as meat eating and, perhaps most determinatively, our early ancestors’ need for social interaction. Early humans had to plan and execute hunts as a group, which required complicated thinking patterns and, it’s been thought, rewarded the social and brainy with evolutionary success. According to that hypothesis, the evolution of the brain was driven by the need to think.

But now some scientists are suggesting that physical activity also played a critical role in making our brains larger.

To reach that conclusion, anthropologists began by looking at existing data about brain size and endurance capacity in a variety of mammals, including dogs, guinea pigs, foxes, mice, wolves, rats, civet cats, antelope, mongooses, goats, sheep and elands. They found a notable pattern. Species like dogs and rats that had a high innate endurance capacity, which presumably had evolved over millenniums, also had large brain volumes relative to their body size.

The researchers also looked at recent experiments in which mice and rats were systematically bred to be marathon runners. Lab animals that willingly put in the most miles on running wheels were interbred, resulting in the creation of a line of lab animals that excelled at running.

Interestingly, after multiple generations, these animals began to develop innately high levels of substances that promote tissue growth and health, including a protein called brain-derived neurotrophic factor, or BDNF. These substances are important for endurance performance. They also are known to drive brain growth.

What all of this means, says David A. Raichlen, an anthropologist at the University of Arizona and an author of a new article about the evolution of human brains appearing in the January issue of Proceedings of the Royal Society B, is that physical activity may have helped to make early humans smarter.

“We think that what happened” in our early hunter-gatherer ancestors, he says, is that the more athletic and active survived and, as with the lab mice, passed along physiological characteristics that improved their endurance, including elevated levels of BDNF. Eventually, these early athletes had enough BDNF coursing through their bodies that some could migrate from the muscles to the brain, where it nudged the growth of brain tissue.

Those particular early humans then applied their growing ability to think and reason toward better tracking prey, becoming the best-fed and most successful from an evolutionary standpoint. Being in motion made them smarter, and being smarter now allowed them to move more efficiently.

And out of all of this came, eventually, an ability to understand higher math and invent iPads. But that was some time later.

The broad point of this new notion is that if physical activity helped to mold the structure of our brains, then it most likely remains essential to brain health today, says John D. Polk, an associate professor of anthropology at the University of Illinois at Urbana-Champaign, and co-author, with Dr. Raichlen, of the new article.

And there is scientific support for that idea. Recent studies have shown, he says, that “regular exercise, even walking,” leads to more robust mental abilities, “beginning in childhood and continuing into old age.”

Of course, the hypothesis that jogging after prey helped to drive human brain evolution is just a hypothesis, Dr. Raichlen says, and almost unprovable.

But it is compelling, says Harvard’s Dr. Lieberman, who has worked with the authors of the new article. “I fundamentally agree that there is a deep evolutionary basis for the relationship between a healthy body and a healthy mind,” he says, a relationship that makes the term “jogging your memory” more literal than most of us might have expected and provides a powerful incentive to be active in 2013.

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This post has been revised to reflect the following correction:

Correction: December 31, 2012

An earlier version of this article misstated the name of a scientific journal. It is the Proceedings of the Royal Society B, not the Proceedings of the Royal Society Biology.

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