11 Facts About the Math Disorder Dyscalculia


Chances are you’ve heard of the reading disability dyslexia. It reportedly affects up to 15 percent of the population, and public figures from the fictional Jaime Lannister in HBO’s Game of Thrones to real-life comic Eddie Izzard have grappled with the learning disorder. But have you ever heard of dyscalculia, the math disability? Probably not, even though up to six percent of elementary school students in the U.S. may struggle with it.

A big part of the general population's unfamiliarity with dyscalculia has to do with our culture’s general discomfort with numbers, and our ingrained belief that math—compared to reading—is just supposed to be hard. Dr. Gavin Price, an assistant professor at Vanderbilt University who has researched dyscalculia in several countries, says, "When I teach classes, I’ll ask at the beginning, 'How many people think they’re not good at math, they’re bad at math?' And half of them put their hands up. Then I ask, 'Are any of you bad at reading?' And nobody puts their hand up."

Dr. Edward Hubbard, an assistant professor at the University of Wisconsin-Madison, echoes this sentiment, and adds that attitudes toward math may play a part not just in our overall lack of dyscalculia awareness, but in the fact that dyscalculia research is at least two decades behind dyslexia research.

“I think some of it is cultural attitudes towards math,” says Hubbard, who has researched dyscalculia in France and the United States and heads up his university’s Educational Neuroscience lab, which is embarking on a new dyscalculia study. “If you look around, the number of people who sort of say, 'I’m bad at math,' and laugh about it, or will say, without batting an eye, 'I’m just not a math person,' is striking.”

So, in the interest of raising dyscalculia awareness, begin your crash course on the little-known mathematical disorder with these 11 facts.

1. The term dyscalculia was coined in the 1940s, but didn’t really become fully recognized until the 1974 work of Czechoslovakian researcher Ladislav Kosc.

Kosc defined the disorder as "a structural disorder of mathematical abilities" caused by impairment to the parts of the brain used in mathematical calculations, without simultaneous impairment to one's general mental abilities. (In layman's terms: You're bad at math because parts of your brain aren't working properly, but you're not otherwise mentally handicapped.) Today, some research communities also use the terms “math dyslexia” and “math learning disability” to refer to the condition.

2. There are two types of dyscalculia.

Most people diagnosed with the disorder have developmental dyscalculia, which means they were born with it. But, with what's known as acquired dyscalculia, the disorder can also arise later in life, usually as the result of a stroke or injury.

3. Struggling with matrices in algebra or flunking calculus in college doesn’t usually mean you have dyscalculia.

This disability tends to impede your most basic skills. “Somebody who has dyscalculia will struggle with the most basic arithmetic facts, 5+2=7,” Hubbard says. “They will struggle to tell you seven is larger than five. We’ll see them counting on their fingers for basic addition.”

4. Dyscalculia may be rooted in the brain's parietal lobe.

What causes dyscalculia? To date, the most popular theory maintains that dyscalculia is connected to an inability to judge quantities, a sense that is concentrated in the parietal lobe.

“One of the theories that exists is that dyscalculia is really caused by an impairment in what’s known as either the number sense or the approximate number system,” Price says. “And that system is what allows us to know that, for example, a group of five apples is more than three apples. It allows us to compare, and order, and process quantities without the use of verbal symbols or labels."

"And so what we did [in a study in Finland]," Price continues, "was scan these dyscalculic kids while they were doing those type of tasks, and we compared their brain activation to the typically developing kids, and we found that indeed this region in the parietal cortex, the intraparietal sulcus, behaved atypically in these kids when they were processing these non-symbolic numerical magnitudes.”

5. Researchers have been able to induce dyscalculia in patients.

In 2007, a group of researchers at University College London were able to engender temporary dyscalculia in people who don’t have the disorder by using transcranial magnetic stimulation, or TMS. TMS is often used to treat depression, and involves placing a large electromagnetic coil against the scalp.

In the study, researchers applied TMS to the right parietal lobe while their subjects were comparing quantities, and found that the stimulation briefly made it hard for the subject to tell if one quantity was bigger than the other.

6. Dyscalculia may manifest itself in different ways. 

While the above research shows that dyscalculia is closely associated with problems in the parietal lobe that affect one's understanding of the number system, researchers like Hubbard think some people who suffer from dyscalculia might feel the disorder differently.

“The problem may not be with number sense itself, but with linking number symbols with number sense,” Hubbard says. “Maybe it differs across other people. Maybe there is a subgroup of people for whom their difficulties are in the number system itself, for other people it’s in symbols.” 

7. Dyscalculia is represented in pop culture.

While dyslexic characters are much more common in popular culture, there are some examples of dyscalculics to be found. Fans of Canadian teen drama Degrassi: The Next Generation may remember Liberty Van Zandt having it, and X-Men fans may know that Wolverine's sidekick Jubilee is a whiz at manipulating pyrotechnics but not numbers.

8. Dyscalculia doesn't discriminate by gender.

You may have noticed that both our pop culture examples were female, but dyscalculia, at least at this juncture, does not appear to have a gender gap.

“My sense is that it’s pretty even. But at the same time, I feel like the gender ratio has been less a focus of investigation than it was for dyslexia,” Hubbard says, adding that research saying boys are more prone to dyslexia than girls is “pretty well supported.”

Hubbard is aware that this flies in the face of the (offensive) stereotype that women are worse at math than men—a generalization that seems to have little basis in fact. “What we see is that the gender differences [in mathematical ability] have gotten smaller and smaller. As we have better role models for girls in math, we’ve had greater opportunities and fewer impediments to girls being able to do well. The differences that we’re seeing are largely due to cultural differences.”

9. However, some groups are at greater risk of dyscalculia than others.

People with Turner syndrome, epilepsy, and Fragile X syndrome are more likely to have dyscalculia. You are also at greater risk for dyscalculia if you have attention deficit hyperactivity disorder (ADHD), if your mother drank during her pregnancy, or if you were born prematurely.

10. It can be tough to diagnose.

“One of the problems, one of the challenges with dyscalculia, the reason that it hasn’t gotten the same attention [as dyslexia], is that it is a highly co-morbid disorder,” Price says. “Often, people who are bad at math are bad at a number of things.”

But while a diagnosis may be difficult to come by, treating a patient's other conditions may also alleviate his or her dyscalculia. For example, one study of people with ADHD who both were and weren’t dyscalculic found that putting them on a stimulant improved their calculating ability, but not their basic numerical skills.

11. There is no cure for dyscalculia.

But don't lose hope! Dyscalculics can learn math, even if they may always struggle with parts of it because of their neurological differences. Luckily, you use more than the parietal part of your brain when doing math, Price says. “Multiple skills come under the umbrella of math, and all of these things will engage all of the lobes of the brain.”

Therefore, early detection is key in helping children cope with dyscalculia. And for adults struggling with the disorder, a shift in attitude may be the first step in overcoming the obstacles dyscalculia presents.

“When we think of struggling with reading, most adults would not think of going back and listening to the sounds of language,” Hubbard says. “Similarly, if you recognize that you’re struggling with math, your first thought isn’t probably that you should go back to trying to see how much stuff is out there, use this basic sense of number that I have, and try to link that to basic number symbol. People would probably try to work at a higher level. What you should really be doing is going back and looking at these foundational skills, things that most teachers, most parents, and most people assume we all just have.”

Kerry Hayes, Warner Bros. Entertainment Inc. and Legendary Pictures
10 Monster Facts About Pacific Rim
Kerry Hayes, Warner Bros. Entertainment Inc. and Legendary Pictures
Kerry Hayes, Warner Bros. Entertainment Inc. and Legendary Pictures

Legendary Pictures took a gamble on Pacific Rim, Guillermo del Toro’s 2013 monster/robot slugfest. Since it wasn’t based on a preexisting franchise, it lacked a built-in fanbase. That can be a serious drawback in our current age of blockbuster remakes and reboots. The movie underperformed domestically; in America, it grossed just over $100 million against its $180 million budget. Yet Pacific Rim was a huge hit overseas and acquired enough fans to earn itself a sequel, Pacific Rim Uprising, which arrives in theaters this week. Here are 10 things you might not have known about the movie that started it all.


Idris Elba in 'Pacific Rim' (2013)
Warner Bros.

One foggy day in 2007, Beacham—who’d recently moved to California—was walking along Santa Monica Beach. As he looked out at the Ferris wheel on the city’s eponymous pier, he pictured a looming sea monster. Then he imagined an equally large robot gearing up to fight the beast. “They just sort of materialized out of the fog, these vast godlike things,” Beacham said. He decided to pursue the concept further after coming up with the idea of human co-pilots who’d need to operate their robot as a team, which added a new thematic dimension.

“I didn’t know I had something I wanted to write until I realized these robots are driven by two pilots, and what happens when one of those people dies? What happens to the leftovers? Then it became a story about loss, moving on after loss, and dealing with survivor’s guilt," Beacham said. "That made the monsters scarier because now you care about the people who are in these robots.”


Pacific Rim was picked up by Legendary Pictures and handed over to director Guillermo del Toro. A huge fan of monster cinema, del Toro enthusiastically co-wrote the final screenplay with Beacham. Sixteen concept artists were hired to sketch original robot and creature designs for the film. “We would get together every day like kids and draw all day,” del Toro told the New York Daily News. “We designed about a hundred Kaijus and about a hundred Jaegers and every week we would do an American Idol and we would vote [some of] them out.”


In “Charlie Kelly: King of the Rats,” the tenth episode of It's Always Sunny in Philadelphia's sixth season, Charlie Day’s character gives us a darkly comedic monologue about rodent extermination. Little did the actor know that the performance would open a big opportunity for him. Impressed by the rat speech, del Toro offered Day the part of Dr. Newton Geizler, Pacific Rim’s socially-inept kaiju expert. “He said to himself, ‘That’s my guy. That guy should be in my next movie because if he killed rats, he can kill the monster,’” Day recalled during an appearance on Late Night with Jimmy Fallon. On the movie set, del Toro often joked about how much he enjoys It’s Always Sunny. As a way of repaying his director, Day helped get del Toro a minor role in the series.


Most of the film’s special effects were computer-generated, but not everything was digital. For the robot cockpit scenes, del Toro had his team build the interior of a full-scale Jaeger head. The finished product stood four stories tall and weighed 20 tons. And like a Tilt-A-Whirl from hell, it was designed to rock around violently on its platform via a network of hydraulics. Once inside, the actors were forced to don 40-pound suits of armor. Then the crew strapped their feet into an apparatus that Charlie Hunnam has compared to a high-resistance elliptical machine.

Certain shots also required del Toro to dump gallons of water all over his exhausted, physically-strained stars. So yeah, the experience wasn’t much fun. “We saw every one of the actors break down on that set except for the female lead actress Rinko Kikuchi," del Toro said. "She’s the only actor that didn’t snap."


Del Toro wanted Gipsy Danger, his ‘bot, to have the self-confident air of a wild west gunslinger. To that end, he and concept artist Oscar Chichoni developed a swaggering gait that was based on John Wayne’s signature hip movements. The Jaeger’s Art Deco-like design was influenced by the Chrysler and Empire State Buildings.


Hailed as the “fortieth greatest guitarist of all time” by Rolling Stone, Rage Against the Machine's Tom Morello rocked the MTV generation with hits like “Bulls on Parade” and “Killing in the Name.” Pacific Rim bears his mark as well. The film’s lead composer was Ramin Djawadi, whose other works include the Game of Thrones theme. Wanting to add a “rock element” to the Pacific Rim soundtrack, he and del Toro reached out to Morello. The guitarist didn’t need much persuading.

“When they asked me to put some giant robot riffs and screaming underwater monster licks on the film score, I was all in,” Morello said. Djwadi was pleased with the rocker's contributions to the project. As he told the press: “Tom’s unique style and sounds really defined our robots.”


A definite highlight of this movie is Gipsy Danger’s duel with the winged kaiju Otachi in downtown Hong Kong. Both characters were computer-generated, as were the majority of the streets, cars, and towers in this epic sequence. However, there is one moment which was at least partly realized with practical effects. Gipsy punches through the wall of an office building early in the fight. We see her fist rip through a series of cubicles and gradually decelerate until it lightly taps a chair with just enough force to set off a Newton’s Cradle desktop toy. For that shot, effects artists at 32Ten Studios constructed a miniature office building interior featuring 1/4-scale desks, cubicles, and padded chairs. The level of detail here was amazing: 32Ten’s staff adorned each individual workspace with lamps, computers, wastebaskets, and teeny, tiny Post-it notes.


Rinko Kikuchi in 'Pacific Rim' (2013)
Kerry Hayes, Warner Bros. Entertainment Inc. and Legendary Pictures

Audiences reacted strongly to Kikuchi’s character Mako Mori, who inspired an alternative to the famous Bechdel test. Some critics praised the culmination of her relationship with Raleigh Beckett (Hunnam). Although it’s common practice for the male and female leads in an action flick to end their movie with a smooch, Mori and Beckett share a platonic hug as Pacific Rim draws to a close. Del Toro revealed that he shot three different versions of that final scene. “We did one version where they kiss and it almost felt weird. They’re good friends, they’re pals, good colleagues,” del Toro said.


At the end of the credits, there’s a tribute that reads: “This film is dedicated to the memories of monster masters Ray Harryhausen and Ishiro Honda.” Harryhausen passed away on May 7, 2013—two months before Pacific Rim’s release. A great stop-motion animator, he breathed life into such creatures as the towering Rhedosaurus in 1953’s The Beast From 20,000 Fathoms.

Ishiro Honda was another giant of the kaiju genre, having directed Rodan, War of the Gargantuas, and numerous Godzilla films. Del Toro has great respect for both men. When Harryhausen died, the director said, “I lost a member of my family today, a man who was as present in my childhood as any of my relatives.” He also adores the Japanese monster classics and says he’d love to see a Pacific Rim-Godzilla crossover someday. Maybe it’ll happen.


If you’re not familiar with the practice of “Sweding,” let us fill you in: The 2008 comedy Be Kind, Rewind is about two co-workers at a VHS rental store who accidentally erase every tape in stock. Hoping to save their skins, they create ultra low-budget remakes of all the films they’ve destroyed using cardboard sets and cheap costumes. It’s a process these guys call “Sweding” as a ploy to convince everyone that their (unintentionally hilarious) knockoffs were produced in Sweden. Since Be Kind, Rewind was released, Sweding has become a legitimate art form.

When Pacific Rim’s first trailer debuted in 2013, YouTubers Brian Harley and Brodie Mash created a shot-for-shot, Sweded duplicate of the preview. Instead of state-of-the-art CG effects, their version used toy helicopters, duct-tape monster masks, and an ocean of packing peanuts—and del Toro loved it. At WonderCon 2013, he praised the video, saying that it inspired the editing used in Pacific Rim’s third trailer. Harley and Mash happened to be at the same gathering. When del Toro met the comedic duo, he exclaimed “I loved it! My daughters loved it, we watched it a bunch of times!” Then he invited the Sweding duo to attend Pacific Rim’s premiere in Hollywood.

5 Ways to Define a Sandwich, According to the Law

It’s easy to say what a sandwich is. Grilled cheese? Definitely a sandwich. Bacon, lettuce, and tomato? There’s no question. Things start to get messy when you specify what a sandwich isn’t. Is a hot dog a sandwich? What about a burrito, or an open-faced turkey melt?

The question of sandwich-hood sounds like something a monk might ponder on a mountaintop. But the answer has real-world implications. On several occasions, governments have ruled on the food industry’s right to use the delectable label. Now, Ruth Bader Ginsburg—pop culture icon, scrunchie connoisseur, and Supreme Court Justice—has weighed in on the matter.

When pressed on the hot-button issue as to whether a hot dog is a sandwich while appearing on The Late Show with Stephen Colbert, Ginsburg proved her extreme judiciousness by throwing the question back at Colbert and asking for his definition of sandwich before making a ruling. Her summation? A hot dog fits Colbert's definition of a sandwich, and therefore can be considered one.

While RBG's ruling may not be an official one, it matches Merriam-Webster's bold declaration that a hot dog is a sandwich (even if the Hot Dog Council disagrees). Officially, here’s where the law stands on the great sandwich debate.


Hot dogs are often snagged in the center of the sandwich semantics drama. Despite fitting the description of a food product served on a bread-like product, many sandwich purists insist that hot dogs deserve their own category. California joins Merriam-Webster in declaring that a hot dog is a sandwich nonetheless. The bold word choice appears in the state’s tax law, which mentions “hot dog and hamburger sandwiches” served from “sandwich stands or booths.” Applying the sandwich label to burgers is less controversial, but it’s still worth debating.


When Qdoba threatened to encroach on the territory of a Panera Bread in Shrewsbury, Massachusetts, the owners of the bakery franchise fought back. They claimed the Mexican chain’s arrival would violate their lease agreement with the White City Shopping Center—specifically the clause that prohibits the strip mall from renting to other sandwich restaurants. “We were surprised at the suit because we think it’s common sense that a burrito is not a sandwich,” Jeff Ackerman, owner of the Qdoba franchise group, told The Boston Globe.

The Worcester County Superior Court agreed. When the issue went before the court in 2006, Cambridge chef and food writer Christopher Schlesinger testified against Panera [PDF], saying, “I know of no chef or culinary historian who would call a burrito a sandwich. Indeed, the notion would be absurd to any credible chef or culinary historian.”

Justice Jeffrey A. Locke ruled that Qdoba would be allowed to move into the shopping center citing an entry in Merriam-Webster as the most damning evidence against Panera’s case. “The New Webster Third International Dictionary describes a ‘sandwich’ as ‘two thin pieces of bread, usually buttered, with a thin layer (as of meat, cheese, or savory mixture) spread between them,’” he said. “Under this definition and as dictated by common sense, this court finds that the term ‘sandwich’ is not commonly understood to include burritos, tacos, and quesadillas.”


If you want to know the definition of a certain dish, the officials at the U.S. Department of Agriculture are good people to ask. It’s their job to make sure that the nation’s supply of meat is correctly labeled. When it comes to sandwiches, the agency follows strict criteria. “A sandwich is a meat or poultry filling between two slices of bread, a bun, or a biscuit,” Mark Wheeler, who works in food and safety at the USDA, told NPR. His definition comes from the Food Standards and Labeling Policy Book used by the department (the USDA only covers the “labeling of meat, poultry, and egg products,” while the FDA handles everything else, which is why the USDA's definition excludes things like grilled cheese). Not included under their umbrella of foodstuff served between bread are burritos, wraps, and hot dogs.


The USDA’s definition may not be as simple and elegant as it seems. A sandwich is one thing, but a “sandwich-like product” is different territory. The same labeling policy book Mark Wheeler referred to when describing a sandwich lumps burritos into this vague category. Fajitas “may also be” a sandwich-like product, as long as the strips of meat in question come bundled in a tortilla. Another section of the book lists hot dogs and hamburgers as examples of sandwich-type products when laying out inspection policies for pre-packaged dinners. So is there an example of a meat-wrapped-in-carb dish that doesn’t belong to the sandwich family? Apparently strombolis are where the USDA draws the line. The Food Standards and Labeling Policy Book clearly states the product “is not considered a traditional sandwich” [PDF].


When it comes to sandwiches, New York doesn’t discriminate. In a bulletin outlining the state’s tax policy, a description of what constitutes a sandwich warrants its own subhead. The article reads:

“Sandwiches include cold and hot sandwiches of every kind that are prepared and ready to be eaten, whether made on bread, on bagels, on rolls, in pitas, in wraps, or otherwise, and regardless of the filling or number of layers. A sandwich can be as simple as a buttered bagel or roll, or as elaborate as a six-foot, toasted submarine sandwich.”

It then moves on to examples of taxable sandwiches. The list includes items widely-believed to bear the label, like Reubens, paninis, club sandwiches, and peanut butter and jelly sandwiches. Other entries, like burritos, gyros, open-faced sandwiches, and hot dogs, may cause confusion among diners.