Dogs can, monkeys and wolves can’t

Thursday, September 13th, 2007

Dogs can, monkeys and wolves can’t:

The researchers held two containers, one empty and the other containing food, in front of chimpanzees and dogs. Then they pointed to the correct container. The canines understood the gesture immediately, while the apes, genetically much more closely related to humans, were often perplexed by the pointing finger.

That’s not all. Many dogs were even capable of interpreting the researcher’s gaze. When the scientists looked at a container, the dogs would search inside for food, but when they looked in the direction of the container but focused on a point above it on the wall, the dogs were able to understand that this was not meant as a sign.

Read the whole cited article.

It is worse than you think

Thursday, September 13th, 2007

Tyler Cowen cites Marty Feldstein to explain why it is worse than you think:

[F]inancing additional government spending by an across the board rise in all marginal tax rates would make the cost per dollar of government spending equal to $1.76.

These two facts — that the actual revenue is only 57 percent of the static gain and that the deadweight loss is 76 cents per dollar of revenue — should be central to any consideration of tax policy. And yet they are not.

Cowen adds to that:

What is talked about even less is that most government programs are, for better or worse, irreversible investments. They don’t fade away very easily, even if they have been proven ineffective or harmful. Do you really think that the Departments of Energy and Education have to pass a market test every year? In fact government programs, on average, grow almost automatically.

Do you know the literature on irreversible investment and option value? Under plausible parameter specifications, you need a benefit-cost ratio of 3 to 1 or more before it makes sense to proceed with the irreversible investment. Otherwise it is better simply to wait. That’s not 1.3 to 1, that’s 3 to 1.

Light and Crime

Thursday, September 13th, 2007

Bruce Schneier cites a New Yorker article on light pollution to discuss light and crime:

Much so-called security lighting is designed with little thought for how eyes — or criminals — operate. Marcus Felson, a professor at the School of Criminal Justice at Rutgers University, has concluded that lighting is effective in preventing crime mainly if it enables people to notice criminal activity as it’s taking place, and if it doesn’t help criminals to see what they’re doing. Bright, unshielded floodlights — one of the most common types of outdoor security lighting in the country — often fail on both counts, as do all-night lights installed on isolated structures or on parts of buildings that can’t be observed by passersby (such as back doors). A burglar who is forced to use a flashlight, or whose movement triggers a security light controlled by an infrared motion sensor, is much more likely to be spotted than one whose presence is masked by the blinding glare of a poorly placed metal halide ‘wall pack.’ In the early seventies, the public-school system in San Antonio, Texas, began leaving many of its school buildings, parking lots, and other property dark at night and found that the no-lights policy not only reduced energy costs but also dramatically cut vandalism.

Good Samaritan Sex Offender

Wednesday, September 12th, 2007

Radley Balko of Reason tells the disturbing story of the Good Samaritan Sex Offender:

The Chicago Sun-Times tells the story of Erasmo Palacios, who, after dropping off his six-year-old daughter at school, was with his wife Rocio and their 22-year-old daughter, all on their way to breakfast when they saw a woman waving her arms. Thinking she was in distress, they approached her in the car, at which point…
…the woman approached their car, parked outside Manolo?s restaurant, leaned in to the passenger side where Rocio was sitting and asked Erasmo if he wanted oral sex for $20 or sex for $25.

The couple laughed, realizing this wasn?t a woman in distress after all.

But within seconds, Chicago police swarmed the family car, hauling Erasmo Palacios out in handcuffs. He was charged with solicitation of a prostitute.

His daughter, who had just run in to exchange her coffee for a hot chocolate, screamed, while his wife cried in fear.

Eight hours later, Palacios, who has no criminal record, was released from custody. And weeks later, charges against him were dropped.

The police report improbably charged that Palacios solicited sex from the undercover officer, even as his wife sat in the passenger seat, and his daughter was on her way out from getting a beverage. Makes you wonder how many men have been wrongfully arrested for solicitation who didn’t have their wives and daughters nearby to vouch for them. Also makes those websites cities put up posting mugshots of suspected (not convicted) johns all the more invidious.

The punchline: Though the charges were dropped, the city seized the family’s car under laws allowing the forfeiture of automobiles used in the solicitation of prostitutes. The city won’t return the car until the Palacios pay $4,700 in towing and storage fees.

Griffin’s Emmy remarks to be censored

Tuesday, September 11th, 2007

Kathy Griffin’s Emmy remarks to be censored:

In her speech, Griffin said that “a lot of people come up here and thank Jesus for this award. I want you to know that no one had less to do with this award than Jesus.”

She went on to hold up her Emmy, make an off-color remark about Christ and proclaim, “This award is my god now!”

The comedian’s remarks were condemned Monday by Catholic League President Bill Donohue, who called them a “vulgar, in-your-face brand of hate speech.”

It’s such a fine line between hate speech and comedy.

Benji Radach’s Injuries

Tuesday, September 11th, 2007

I just watched an interview with IFL fighter Benji “Razor” Radach, and he has endured a ludicrous number of awful injuries. I found an online interview where he explains some of what he’s gone through:

It’s been a crazy road. The first thing, it actually started right before my last fight with Chris Leben about three years ago, I was bit by a brown recluse spider, it got infected, and I had about a golf ball sized hole in my calf. I was just getting over that when I took the fight with Leben, we went into the third round and I got caught with a left hook and it broke my jaw.

After that not much longer I had healed up from my jaw, which took about six months, and I was training to fight JT Taylor up at the Tacoma Dome with Tito Ortiz, Ivan Salaverry and Dennis Hallman. I was training with Ivan and afterwards I had this huge pain running through one side of my trap and down my back, so I went in and found out I had to have surgery because it was a herniated disk. It had broken off, was floating around and mashed up a bunch of nerves. So I woke up in the morning and couldn’t even flex my chest muscle in my right pec or my right tricep. I had to wait two months to have surgery due to my job and during that time I had lost the muscles down to the bone. I got surgery and took another six months or more to get through that or more actually.

I started rolling again, joined the ATT a year later, started getting in good shape and tore my meniscus in my knee. I hadn’t had an ACL in that knee since I was about 10 years old, so I decided to get both done at the same time. I went to LA, had the surgery and got a humungous staff infection in the knee. It was bad; they almost cut my leg off. I had to fight the infection for three months, I had a catheter in my arm that went all the way to my heart and had to have a nurse come in twice a day to deal with it. That was just last March or April when I had all that done. It’s kind of crazy where I’m at right now considering all the crazy stuff I’ve had happen to me.

NBC pumps up for ‘Gladiators’ redo

Tuesday, September 11th, 2007

American Gladiators is coming back, as Variety reports in NBC pumps up for ‘Gladiators’ redo:

Airing in syndication from 1989-96, “American Gladiators” focused on physically fit amateur athletes who competed against the show’s regulars (action stars, stunt professionals and pro athletes) in various physical strength and endurance competitions.

The show hit it big by showcasing David vs. Goliath-style battles in events such as the Joust, the Wall, the Eliminator and Hang Tough. Coincidentally, the original “Gladiators” shot its first several seasons at Universal Studios.

Plestis said he was particularly interested in the original U.K. version of “Gladiators,” which focused even more on the characters and the behind-the-scenes stories of common folk going up against the show’s powerful stars. The new “Gladiators,” he said, “will have the scale, scope, different characters and family drama that the U.K. version had.”

“We’re not going to completely reinvent the wheel here,” he said. “But we’re making it better, faster and stronger.”

Show will follow eight gladiators — four men and four women — as they take on contestants both male and female. This time, in a new wrinkle, the players will be given the opportunity to train for their match — and viewers will be given a glimpse of their personalities prior to the actual competish.

MGM Worldwide TV co-prexy Jim Packer said reviving “Gladiators” was part of a strategy to mine the company’s library and revive franchises for a new generation of TV viewers. Repeats of the original show are currently posting decent ratings on ESPN Classic, he noted.

I had no idea there was an original UK version.

Gifted research parrot Alex found dead

Tuesday, September 11th, 2007

Gifted research parrot Alex found dead — yet there’s no mention of “fowl play”:

A gifted parrot that could count to six, identify colors and even express frustration with repetitive scientific trials has died after 30 years of helping researchers better understand the avian brain.

The death of Alex, an African Grey parrot, left scientists at Brandeis University feeling as if they’d lost a colleague.

“It’s devastating to lose an individual you’ve worked with pretty much every day for 30 years,” scientist Irene Pepperberg told The Boston Globe. “Someone was working with him 8 to 12 hours every day of his life.”

Alex’s advanced language and recognition skills revolutionized the understanding of the avian brain. After Pepperberg bought Alex from an animal shop in 1973, the parrot learned enough English to identify 50 different objects, seven colors, and five shapes. He could count up to six, including zero, was able to express desires, including his frustration with the repetitive research.

He also occasionally instructed two other parrots at the lab to “talk better” if they mumbled, though it wasn’t clear if he was simply mimicking researchers.

Pepperberg said Alex hadn’t reached his full cognitive potential and was demonstrating the ability to take distinct sounds from words he knew and combine them to form new words. Just last month he pronounced the word “seven” for the first time.

The cause of Alex’s death was unknown. The African Grey parrot’s average life span is 50 years, Pepperberg said. She said Alex was discovered dead in his cage Friday morning. Pepperberg said she waited to release the news until Monday so grieving researchers could get over the shock and talk about it.

Pepperberg said the last time she saw Alex on Thursday, they went through their goodnight routine, in which she told him it was time to go in the cage and said: “You be good, I love you. I’ll see you tomorrow.”

Alex responded, “You’ll be in tomorrow.”

Another article’s headline did go for the easy pun: Bird brain dies after years of research.

Prenatal testosterone may play autism role

Tuesday, September 11th, 2007

Prenatal testosterone may play autism role:

Children exposed to high levels of testosterone in the womb showed more autism-related traits later in life, according to findings that suggest the male hormone may play a key role in the complex brain disorder.

The results support a hypothesis that higher levels of testosterone may contribute to autism and reinforce findings from tests on animals, said Simon Baron-Cohen, director of the Autism Research Centre at Britain’s Cambridge University, who worked on the study.
[...]
In Baron-Cohen’s ongoing study, the researchers measured fetal testosterone levels from pregnant women who had amniotic fluid taken for other reasons.

When the children were eight years old, the researchers used questionnaires to see whether they preferred social to solitary activities and how empathetic they were.

This allowed them to measure traits, that in an extreme form, are indicative of autism. In the study children with higher levels of fetal testosterone were better at things such as remembering patterns but not as interested in socializing.

The next step is collaborating with Danish researchers to tap a biological bank that has about 90,000 amniotic fluid samples to test whether there is a direct link between fetal testosterone and autism.

Gregory Cochran and Overclocking

Tuesday, September 11th, 2007

Michael Blowhard recently interviewed Gregory Cochran. Here’s how he introduced him:

A professor at the University of Utah, Cochran is a physicist, an anthropologist, and a genetics researcher and theorist. He’s well known for his belief that many ailments that we now think of as genetic might well be of pathogenic origin instead. With Henry Harpending and Jason Hardy, he authored a paper suggesting that the high average IQ of Ashkenazi Jews — as well as their pattern of genetic diseases — might be an evolutionary consequence of their history of persecution and their emphasis on jobs involving lots of brainpower. The paper received extensive coverage in the Economist and the New York Times.

Evidently Cochran was “right” about Iraq long before things hit the fan:

Since I read the paper every single day, I knew roughly how much oil Saddam was smuggling out by truck and how big a kickback he was getting on the oil-for-food exports. A horseback guess said that the whole Iraqi state was running on a billion dollars a year. Took about fifteen minutes of Googling to determine that. Not much to pay for an army, secret police, palaces out the wazoo, and an invisible, undetectable Manhattan project. Which was right on the money, as later laid out in reports by Duelfer and Paul Volcker.

I’m told that the CIA doesn’t do this kind of capacity analysis, why, I dunno.

An interesting bit of perspective on our military leaders:

I think that once upon a time the service academies were competitive, and picked up some very smart people. Today, when the Air Force Academy is the 78th-best engineering school in the country, they don’t get the same quality that West Point could before the Civil War, as the best free education in the country. Today, the average general spends his spare time reading BassMaster Journal, according to Tom Ricks, and that sounds believable to me.

Here’s an amusing irony:

More often than not imperial adventures are money-losers nowadays and don’t actually make the central country stronger. For example, the Soviets thought that the tide was with them after Vietnam and intervened in Afghanistan, Ethiopia, Angola, Mozambique, etc. All cost money and none did them a lick of good. You could make a pretty good case that our losing in Vietnam and electing Carter sucked them into a losing game in the Third World. Aren’t we subtle?

The interview spurred me to read Cochran’s piece on Overclocking the human brain — which he followed up with an entertaining list of science-fiction scenarios:

A. The drugs could be too expensive for universal use.

A1. I doubt if they would be in the millionaire-only club — I don’t think any other drug is, really, not if there are a lot of customers to spread the fixed costs over.

A2. But it would be easy for them to be too expensive for general use in non-first-world countries. Them that has, gets. Even if too expensive for general use in a poor country, the kakistocrats could probably afford them, making revolution harder. Dictators would, as a perk, get smarts as well as power. The gap between us and , say, Guinea Bissau would become awesome.

A3. There might be a medium-sized but significant time lapse between elite use and general use. Would our government disintegrate in the interim?.

A4. A cabal keeps the drugs secret and strives for world domination. Sounds like fun. See E.

B. There might be side effects.

B1. You die after a while. Flowers for Algernon.

B2. You are physically messed up but don’t die, something like the kids with torsion dystonia. I doubt this though, because these mutations are very recent and have not been refined by natural selection. And most people with that torsion dystonia mutation never get sick. Since that is the case, it is probably easy to improve them, reduce side effects, etc. They are non-optimized and so can be optimized. If nothing else, take a break now and then from the drugs. Carriers can’t do that. Hmm.. if there is a risk of physical problems, would people use them anyhow? Most would-be Olympians would take a drug that killed them in five years if it gave them a gold medal: are wannabe Nobelists that tough? Would we use it in a desperate situation, a war? Should we force it on our researchers, for the greater good?

B3. The drugs change your personality in interesting and/or undesirable ways. This side effect too could probably be ameliorated, but it might be tricky.

C. They only work if taken in early life.. Then us geezers might be pushed aside by the rising generation in a new and spectacular way. In fact, the country might not even be run by middle-aged people at all.

C1. They work some, not as well, if you start late.

D. They increase intelligence a lot. Might be possible: if we’re talking the Ashkenazi mutations, hardly anyone has more than one, just about nobody more than two. One in two thousand Ashkenazi, at most, carry a Tay-Sachs mutation and a Gaucher mutation, the two most common. But using drugs, we could in principle give you the torsion dystonia effect and the Gaucher-carrier effect and the Tay-Sachs–carrier effect and the Canavan-carrier effect. and the familial dysautonomia carrier effect. As a rough guess, might give you considerably more than 20 pts — torsion dystonia gives about ten all by itself.

D1. Add even one standard deviation and society is transformed. Somehow I think that Poul Anderson”s Brainwave missed the point.

D2. Real smart people become so much smarter as to be un-understandable by usuns. This is a lot like Vinge’s Singularity, or his old short story Bookworm, Run !.

D2a. They stop having children altogether. if you extrapolate, that is certainly the trend, at least among women. The higher the IQ, the lower the fertility.

D2b. The incomprehensibly smart all convert to Catholicism. Or to something else. To them it is obvious.

D2c. The incomprehensibly smart figure out ways to get even smarter. This story can’t be told.

D3. We run similar genetic analysis on famously smart people, looking for strong IQ genes. Before we’re done we dig up Newton, Gauss, Clerk Maxwell, and steal Einstein’s brain

D4. We test it on chimps and overshoot. That could be bad.

E. The government bans it — the powers that be want to stay the powers that be. It’ll only work if the powers that be have their own trump — say, real machine intelligence, or maybe people souped-up with a computer connection, as in Starswarm. Or, hydrogen bombs, coupled with a world technological inquisiton, especially biotechnology. See Niven’s ARM stories, Poul Anderson’s Shield, [Jerry Pournelle's] CoDominium, Vinge’s The Peace War .

E1. Some countries ban it, while other countries, or other sub-national groups, try it. Beyond This Horizon, many others.

E2. Groups that currently have such genetic advantages wish to keep their edge and support the ban. Up to now, people could kill or oppress you but they couldn’t be you, couldn’t steal your essence. That was then.

E3. The government bans it for everyone other than themselves, for good national-security reasons. We wouldn’t want super-smart terrorists, would we? Shortly thereafter, hereditary rule is imposed. it now works because regression to the mean doesn’t make the nephew stupid; intelligence is a perk of office.

E4. The government only allows use on the slow: only for leveling. Never work of course.

Fear and Loathing at the Airport

Tuesday, September 11th, 2007

Why do we find so much Fear and Loathing at the Airport?

One of the big reasons flying is so miserable is because airlines schedule more flights at desirable times than airports can handle — much as they sell seats to more passengers than their planes can hold. On a typical Tuesday morning in August at New York’s John F. Kennedy International, the airport has enough capacity for around 44 departures between 8 and 9 a.m. But airlines schedule 57, guaranteeing delays, even under perfect conditions.

The carriers are well aware that their commitments to travelers are often impossible to keep, but they make them anyway because they like to give passengers what they want. And everyone prefers to fly in the morning or early evening so they can get in a day of work or play on the day they fly. “We don’t schedule flights at one o’clock in the morning because people don’t want to travel at that time,” says Peter McDonald, chief operating officer of UAL Corp.
[...]
In the short term, the most effective way to solve the congestion problem would be for Congress to authorize auctioning off the right to fly into overburdened airports — a move that would allow the FAA to limit the number of takeoffs. The rights could expire every few years, opening up the market to competitors, while the money raised could pay for airport improvements. Underbidders could schedule more flights at smaller, less crowded airports or at off hours. “If we auctioned off the space at the 10 worst airports, it would go a long way towards fixing the national problem,” says George Donohue, a former FAA official who now teaches engineering at George Mason University.

But the airline industry, which is just now getting back on its feet after a horrible few years of losses, layoffs, bankruptcies, and restructurings, opposes the idea. Auctions would raise costs for the carriers, who have fought their way back to solvency by economizing on customer service. It is now considered unlikely that Congress, which took away the federal bureaucratic authority over routes and pricing when it deregulated the airline industry in 1978, will consider the auction proposal this year. “If you can’t deal with scheduling,” observes former Transportation Dept. inspector general Ken Mead, “you don’t have as much authority as people think.”

As George Donohue, the former FAA official, points out, auctioning off space would fix much of the problem. It’s yet another example of a tragedy of the commons. Each airline wants to schedule as many flights as possible during prime flying times, but an airline does not pay for using up scarce prime-time space.

The article asserts that auctions would raise costs for carriers — and they would, if they stopped there — but the carriers could easily be given credit for the space they’re already using, so that the auctions end up revenue-neutral overall.

Also, it’s a shame that the article notes that carriers “sell seats to more passengers than their planes can hold” without explaining why. It’s not simply because the airlines are evil. Air fares aren’t fair — or don’t seem that way — because, unlike most tangible goods you buy, a flight has very high fixed costs and very low variable costs. Virginia Postrel explains:

The essential problem is matching capacity with demand, which requires making spending decisions far in advance of ticket sales. That may not sound unusual — many businesses have to guess how much product to make — but the problem is harder for airlines than for manufacturers. If they plan for too many passengers, they can’t carry the extra seats in inventory.

“Either you sell the seat for this particular flight for this hour or you don’t sell it,” said Pablo Spiller, an economist at the Haas School of Business at the University of California at Berkeley. “You can’t say, ‘I’ll keep the Thursday, Oct. 4, seat at 5 for next week.’ No, it went away, that seat.”

If planes fly with few passengers because an airline overestimated demand, those flights tend to lose money. For a given flight, the costs of fuel, labor and the aircraft itself are essentially fixed, regardless of how many passengers the plane is carrying. That’s why the airline’s “load factor,” the percentage of seats filled, is such an important indicator of how well it is doing.

When the load factor drops, airlines tend to get into fare wars. Adding another passenger to a given flight costs almost nothing, so any additional revenue will help cover those fixed costs. If one airline has too much capacity, it will sharply reduce fares to fill up its planes. Competitors will drop their fares to match, lest they lose their passengers.

Repeated Drills To Learn Material Should Be Spread Over Time

Tuesday, September 11th, 2007

Randall Parker (FuturePundit) cites a study showing that “overlearning” — continuing to study after you’ve mastered the material — has some benefits, but they rapidly fade:

University of South Florida psychologist Doug Rohrer decided to explore this question scientifically. Working with Hal Pashler of the University of California, San Diego, he had two groups of students study new vocabulary in different ways. One group ran through the list five times; these students got a perfect score no more than once. The others kept drilling, for a total of ten trials; with this extra effort, the students had at least three perfect run-throughs. Then the psychologists tested all the students, some one week later and others four weeks later.

The results were interesting. For students who took the test a week later, those who had done the extra drilling performed better. But this benefit of overlearning completely disappeared by four weeks. In other words, if students are interested in learning that lasts, that extra effort is really a waste. They should instead spend this time looking at material from last week or last month or even last year.

In other words, as reported in the August issue of Current Directions in Psychological Science, “massing” all the study on a single topic into a single session reduces long-term retention. It’s better to leave it alone for a while and then return to it. Rohrer and Pashler also wanted to see if the duration of study breaks might make a difference in learning. It did. When two study sessions were separated by breaks ranging from five minutes to six months, with a final test given six months later, students did much better if their break lasted at least a month. So, rather than distribute their study of some material across just a few days, as millions of school children do when given a different list of vocabulary or spelling words each week, students would be better off seeing the same words throughout the school year.

All these experiments involved rote learning, but Rohrer and Pashler have also found similar effects with more abstract learning, like math. This is particularly troubling, the psychologists say, because most mathematics textbooks today are organized to encourage both overlearning and massing. So students end up working 20 problems on the same concept (which they learned earlier that day) when they should be working 20 problems drawn from different lessons learned since the beginning of the school year. In brief, students are wasting a lot of precious learning time.

Institutional changes prerequisite to the industrial revolution

Tuesday, September 11th, 2007

In discussing Gregory Clark’s A Farewell to Alms, Nick Szabo counters Clark’s claim that England experienced no significant institutional improvements from 1300 to 1800. Here is his list of institutional changes prerequisite to the industrial revolution:

  • The mechanical clock, 14th century. The resulting rise of clock culture and the time wage may have slowly but radically improved the coordination and work habits of Europeans. Earlier adaptation to clock culture, a process that may take centuries to evolve, may explain the large discrepencies between European and many non-European laborer work habits that Clark cites.
  • The printing press and the rise of book consciousness, which radically decreased the costs of teaching economically important knowledge to both children and adults. The rise of book consciousness, reflected in the literacy and book cost data Clark graphs, explains the most prominent puzzle revealed by Clark’s data: the fact that skills and innovation rose dramatically even as the rewards to skills were stagnant or declined.
  • Nationalization the Church in England and secularization of family law, 16th century.
  • The incorporation of the Lex Mercatoria into the common law, and the resulting rise of modern contract law, 18th century. Indeed, much of this occured in the same decades as the start of the industrial revolution.
  • The “Romanization” of property law, rendering land more freely saleable, divisible, and mortgageable, which Adam Smith noted was an important improvement still in process at his time.
  • The rise of marine insurance (e.g. Lloyd’s of London) and the associated rise of colonialism and world trade, 17th-18th century.
  • The decline of guilds and monopolies, 16th-18th centuries. Medieval England was certainly not a highly competitive market economy. Commerce in goods was dominated rather by monopolies and a variety of price and quality controls instituted by guilds and towns.

Sparq Training

Tuesday, September 11th, 2007

I was watching the season premiere of The Contender, when they decided to put the fighters through a series of high-tech Sparq Training tests to assess their power, agility, endurance, and reflexes. It was so very Rocky IV:

The lightboard test, which tests perception and reflexes, might make a good general screening tool, but it doesn’t test the sport-specific perception that’s crucial to high-level performance:

“Top tennis players can predict the direction and speed of the ball before it leaves the racket,” Farrow says. “So what is it these experts intuitively see that the rest of us don’t? What cues are they picking up on, and when?”

To understand what experts were seeing, Farrow meticulously dismantled the mechanics of the serve. He recruited two groups of players — novices and experts — and outfitted each with earmuffs and occlusion goggles, clear glasses that turn opaque when an assistant on the sidelines flips an electronic switch. He then put the athletes on court opposite an expert server. As the server’s arm went back for the shot, Farrow would black out the goggles, leaving players to swing blindly at the incoming ball.

The experiment was not for the faint of heart. Even relatively gentle serves arrived at 60 miles per hour, battering receivers who happened to step into the shot. “The men in particular got uneasy,” Farrow says dryly. He pulls out a faded photo of a man in tennis whites, standing in the ready position and peering through an oversize pair of plastic lenses. “You can see that he has a nervous grin on his face.”

The point of the exercise was to identify exactly when a seasoned player knew where the ball would head. Farrow established five possible windows: First, he blackened the goggles just as the ball’s flight path over the net was determined; second, as the server’s racket made contact with the ball. Then he gave players less and less information — cutting off the image when the server’s arm was cocked, as it was being drawn back, and, finally, at the very start of the toss.

Not surprisingly, receivers were better at guessing the ball’s direction the later their vision cut out. But the results also revealed something more interesting. Graphs of the amateurs’ reactions showed that they could anticipate where the ball would go only if they witnessed the racket making contact with it. Experts knew what would happen roughly a third of a second earlier, when the server’s cocked arm was still unfolding.

What happened in that fraction of a second? A lot, Farrow reasoned. Up to a point, he theorized, the direction of a serve was fundamentally unpredictable: Whatever clues existed weren’t ones that an opposing player could discern. By the time the ball had been hit, on the other hand, even a novice could make a plausible guess at its trajectory. What separated the pros from everyone else was the ability to pull directional information out of the early stages of a swing and therefore to predict a split second earlier where to head. This fraction of time is game- changing. A serve going 120 miles per hour takes approximately a third of a second to travel the 60 feet from baseline to service line. This means that an expert, who doesn’t have to wait until contact, has twice as long to move, plant his feet, and swing.

This discovery fit with something Farrow and other tennis researchers had already suspected: Reflex speed is not the key factor in returning a serve. “People have tested casual players and experts, and their reaction times are essentially the same,” Farrow says. The fact that Roger Federer can drill back a 140-mile-per-hour serve is partly a matter of muscle control. But it’s also about processing subtle visual cues to predict where the ball will go and get to the right spot.

Stay Away From Stocks

Monday, September 10th, 2007



When I first learned about call options, they struck me as something that should appeal to the average investor, because they limit downside risk — and most people don’t mind a volatile upside so much.

As Stay Away From Stocks notes, Boston University’s Zvi Bodie has been recommending “risk-free” investments, like Treasury inflation-protected securities, or TIPS, and — for the daring investor — “out of the money” call options on a market index.

I suppose that matches most people’s risk profile.