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11 Facts About the Math Disorder Dyscalculia

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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.”

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15 Things You Might Not Know About Chewbacca
ANTONIN THUILLIER, AFP/Getty Images
ANTONIN THUILLIER, AFP/Getty Images

Even if you don't know the name Peter Mayhew, you surely know about Chewbacca—the seven-foot tall Wookiee he has played onscreen for over three decades. In honor of Mayhew’s birthday, here are 15 things you might not know about Han Solo's BFF.

1. HE WAS INSPIRED BY GEORGE LUCAS'S DOG.

The character of Chewbacca was inspired by George Lucas’s big, hairy Alaskan malamute, Indiana. According to Lucas, the dog would always sit in the passenger seat of his car like a copilot, and people would confuse the dog for an actual person. And in case you're wondering: yes, that same dog was also the inspiration behind the name of one of Lucas’s other creations, Indiana Jones.

2. HIS NAME IS OF RUSSIAN ORIGIN.

The name “Chewbacca” was derived from the Russian word Sobaka (собака), meaning “dog.” The term “Wookiee” came from voice actor Terry McGovern; when he was doing voiceover tracks for Lucas's directorial debut, THX 1138, McGovern randomly improvised the line, “I think I just ran over a Wookiee” during one of the sessions.

3. HE'S REALLY, REALLY OLD.

In Star Wars Episode IV: A New Hope, Chewbacca is 200 years old.

4. PETER MAYHEW'S HEIGHT HELPED HIM LAND THE ROLE.

Peter Mayhew
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Mayhew was chosen to play everyone’s favorite Wookiee primarily because of his tremendous height: He's 7 feet 3 inches tall.

5. HIS SUIT IS MADE FROM A MIX OF ANIMAL HAIRS, AND EVENTUALLY INCLUDED A COOLING SYSTEM.

For the original trilogy (and the infamous holiday special), the Chewbacca costume was made with a combination of real yak and rabbit hair knitted into a base of mohair. A slightly altered original Chewie costume was used in 1999's The Phantom Menace for the Wookiee senator character Yarua, and a new costume used during Episode III included a specially made water-cooling system so that Mayhew could wear the suit for long periods of time and not be overheated.

6. ONE OF STANLEY KUBRICK'S CLOSEST CREATORS DESIGNED THE COSTUME.

Chewbacca's costume
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To create the original costume for Chewbacca, Lucas hired legendary makeup supervisor Stuart Freeborn, who was recruited because of his work on the apes in the “Dawn of Man” sequence in Stanley Kubrick’s 2001: A Space Odyssey. (Freeborn had also previously worked with Kubrick on Dr. Strangelove to effectively disguise Peter Sellers in each of his three roles in that film.) Freeborn would go on to supervise the creation of Yoda in The Empire Strike Back and Jabba the Hutt and the Ewoks in Return of the Jedi.

Lucas originally wanted Freeborn’s costume for Chewie to be a combination of a monkey, a dog, and a cat. According to Freeborn, the biggest problem during production with the costume was with Mayhew’s eyes. The actor’s body heat in the mask caused his face to detach from the costume's eyes and made them look separate from the mask.

7. FINDING CHEWBACCA'S VOICE WAS BEN BURTT'S FIRST ASSIGNMENT.

The first sound effect that director George Lucas hired now-legendary sound designer Ben Burtt for on Star Wars was Chewbacca’s voice (this was all the way back during the script stage). During the year of preliminary sound recording, Burtt principally used the vocalization of a black bear named Tarik from Happy Hollow Zoo in San Jose, California for Chewbacca. He would eventually synchronize those sounds with further walrus, lion, and badger vocalizations for the complete voice. The name of the language Chewbacca speaks came to be known in the Star Wars universe as “Shyriiwook.”

8. ROGER EBERT WAS NOT A FAN.

Roger Ebert was not a fan of the big guy. In his 1997 review of the Special Edition of The Empire Strikes Back, Ebert basically called Chewbacca the worst character in the series. “This character was thrown into the first film as window dressing, was never thought through, and as a result has been saddled with one facial expression and one mournful yelp," the famed critic wrote. "Much more could have been done. How can you be a space pilot and not be able to communicate in any meaningful way? Does Han Solo really understand Chewie's monotonous noises? Do they have long chats sometimes? Never mind.”

9. HE WAS ORIGINALLY MUCH MORE SCANTILY CLAD.

In the summary for Lucas’s second draft (dated January 28, 1975, when the film was called “Adventures of the Starkiller, Episode I: The Star Wars”), Chewbacca is described as “an eight-foot tall, savage-looking creature resembling a huge gray bushbaby-monkey with fierce ‘baboon’-like fangs. His large yellow eyes dominate a fur-covered face … [and] over his matted, furry body he wears two chrome bandoliers, a flak jacket painted in a bizarre camouflage pattern, brown cloth shorts, and little else.”

10. HIS DESIGN WAS BASED ON RALPH MCQUARRIE'S CONCEPT ART.

Chewbacca’s character design was based on concept art drawn by Ralph McQuarrie. Lucas had originally given McQuarrie a photo of a lemur for inspiration, and McQuarrie proceeded to draw the character as a female—but Chewbacca was soon changed to a male. McQuarrie based his furry design on an illustration by artist John Schoenherr, which was commissioned for Game of Thrones scribe George R.R. Martin’s short story “And Seven Times Never Kill a Man.” Sharp-eyed Chewbacca fans will recognize that Schoenherr’s drawing even includes what resembles the Wookiee’s signature weapon, the Bowcaster.

11. HE WON A LIFETIME ACHIEVEMENT AWARD.

Fans were angry for decades that Chewie didn’t receive a medal of valor like Luke and Han did at the end of A New Hope, so MTV gave him a Lifetime Achievement Award at the 1997 MTV Movie Awards. The medal was given to Mayhew—decked out in full costume—by Princess Leia herself, actress Carrie Fisher. His acceptance speech, made entirely in Wookiee grunts, lasted 16 seconds. When asked why Chewbacca didn’t receive a medal at the end of the first film, Lucas explained, “Medals really don’t mean much to Wookiees. They don’t really put too much credence in them. They have different kinds of ceremonies.”

12. HE HAS A FAMILY BACK HOME.

According to the infamous Star Wars Holiday Special, Chewbacca had a wife named Mallatobuck, a son named Lumpawaroo (a.k.a. “Lumpy”), and a father named Attichitcuk (aka “Itchy”). In the special, Chewie and Han visit the Wookiee home planet of Kashyyyk to celebrate “Life Day,” a celebration of the Wookiee home planet’s diverse ecosystem. The special featured appearances and musical numbers by Jefferson Starship, Diahann Carroll, Art Carney, Harvey Korman, and Bea Arthur, and marked the first appearance of Boba Fett. Lucas hated the special so much that he limited its availability following its original airdate on November 17, 1978.

13. MAYHEW'S BIG FEET ARE WHAT KICKSTARTED HIS CAREER.

Mayhew’s path to playing Chewbacca began with a string of lucky breaks—and his big feet. A local London reporter was doing a story on people with big feet and happened to profile Mayhew. A movie producer saw the article and cast him—in an uncredited role—as Minoton the minotaur in the film Sinbad and the Eye of the Tiger. One of the makeup men on Sinbad was also working on the Wookiee costume with Stuart Freeborn for Star Wars and suggested to the producers that they screen test Mayhew. The rest is Wookiee history.

14. MAYHEW KEPT HIS DAY JOB WHILE SHOOTING STAR WARS.

Peter Mayhew
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During the shooting of Star Wars, Mayhew kept working his day job as a deputy head porter in a London hospital. Though he was let go because of his sudden varying shooting schedule at Elstree Studios, he was eventually hired back after production wrapped.

15. DARTH VADER COULD HAVE BEEN CHEWBACCA.

Darth Vader
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David Prowse, the 6’5” actor who ended up portraying Darth Vader—in costume only—originally turned down the role of Chewbacca.  When given the choice between portraying the two characters, Prowse said, “I turned down the role of Chewbacca at once. I know that people remember villains longer than heroes. At the time I didn’t know I’d be wearing a mask, and throughout production I thought Vader’s voice would be mine.”

Additional Sources: Star Wars DVD special features
The Making of Star Wars: The definitive Story Behind the Original Film, J.W. Rinzler

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Stones, Bones, and Wrecks
6 Priceless Treasures Lost in Shipwrecks
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In the lore around treasures lost at sea, most of the excitement goes to pirate’s gold and the sunken luxuries of the Titanic. But in the centuries of human seafaring, many lesser-known priceless objects, from literary manuscripts to scientific research, have been claimed by the depths. Here are some tales of those losses, from a lifetime of work by a 19th-century woman who was an expert in cephalopods, to a rare book by Dickens that went down with the Lusitania.

1. LOUIS DE JAUCOURT'S ANATOMICAL LEXICON

Always, always, always back up your work. Of course, that's easier now than it was in the 18th century, when French scholar Louis de Jaucourt dispatched his six-volume Lexicon medicum universale to his Amsterdam publisher, a move intended to evade French censorship. The medical dictionary, on which he'd spent 20 years, was completely lost when the ship it was on sank off Holland's coast. Luckily, Jaucourt rebounded when Denis Diderot asked him to contribute to the Encyclopédie, now considered one of the greatest works of Enlightenment thought, for which he used his notes from the lost manuscript. Jaucourt became the publication's most prolific author, penning 40,000 articles—so many he was nicknamed l'esclave de l’Encyclopédie, or the "slave of the Encyclopedia."

2. THE FIELDWORK OF ALFRED RUSSEL WALLACE

Portrait of Alfred Russel Wallace, Welsh naturalist and explorer
Hulton Archive/Getty Images

In 1852, following four years of research in the Amazon, the British naturalist Alfred Russel Wallace was ready to return to England. He loaded his copious notes, animal and plant specimens, and drawings onto the brig Helen. Just 26 days into the voyage, the vessel caught fire. Wallace only had time to hastily fill a tin box with a few drawings of fish and palms and some scientific notes before joining the crew in the lifeboat. After 10 days marooned at sea, they were rescued by the brig Jordeson—but most of Wallace's work was gone forever. As he lamented in an October 19, 1852 letter, "The only things which I saved were my watch, my drawings of fishes, and a portion of my notes and journals. Most of my journals, notes on the habits of animals, and drawings of the transformations of insects, were lost.” While he continued as a leading naturalist—albeit one overshadowed in his evolution research by Charles Darwin—Wallace was never able to reconstruct those years of fieldwork.

3. THE CEPHALOPOD RESEARCH OF JEANNE VILLEPREUX-POWER

Before Jeanne Villepreux-Power’s 19th-century research, most scientists thought the Argonauta argo, or paper nautilus, scavenged its shell from other animals. But by inventing the modern aquarium, Villepreux-Power could study the species first-hand, and witness how it grows and repairs its own shell. The breakthrough was one of many discoveries made by the pioneer in cephalopod research, one of the few women to achieve prominence in Victorian science. She might be better known today if it weren't for the fact that when she and her husband decided to move from Sicily to London, the vessel on which they’d shipped their possessions—including the majority of her drawings, notes, and equipment—foundered off the coast of France in 1843. After the devastating loss, she never published again.

4. A COPY OF A CHRISTMAS CAROL OWNED BY CHARLES DICKENS

Sinking of the Lusitania
Three Lions/Getty Images

When Boston bookseller Charles Lauriat realized the RMS Lusitania was doomed that fateful day in 1915, he dashed to his cabin, using the light from a few matches to try to find the literary treasures he’d brought aboard. These included original drawings by Vanity Fair author William Makepeace Thackeray, as well as an edition of A Christmas Carol owned by Charles Dickens himself. The edition was irreplaceable, since it included Dickens’s notes related to his 1844 copyright suit against the illicit republishing of his story. In the book Dead Wake: The Last Crossing of the Lusitania, Erik Larson vividly describes Lauriat’s harrowing experience when the ocean liner was torpedoed by a German U-boat off the coast of Ireland: Lauriat grabbed the leather briefcase containing the Dickens, but left the Thackeray sketches behind. Rushing out to the deck, he saw a lifeboat packed with women and children that was being dragged down by the sinking ship. He jumped in with the briefcase, yet was unable to free the lifeboat, and in the escape into the water he lost the precious cargo. Out in the waves, he managed to evade entanglement with an antenna, swim to a collapsible lifeboat, and survive. One of the few items he managed to save were photographs of his baby, which he told his wife were his "mascot."

5. WRITINGS OF JOSÉ ASUNCIÓN SILVA

Portrait of José Asunción Silva

Many Colombians can recite the first lines from the influential Modernist poet José Asunción Silva's "Nocturne III"—"A night / A night full of hushings, of the curled wool of perfume / And incanting wing"—and it’s even printed in microtext on the 5000 Colombian peso bill. The poem, written in 1892, is believed to be a tribute to Silva’s half-sister. Silva suffered another blow in 1895, when many of his manuscripts, including a draft of a novel, were lost in a shipwreck. He left his diplomatic post in Venezuela, and dedicated all his time to reconstructing the drowned novel. But his melancholy continued: After visiting a doctor to ask the exact position of his heart, he shot himself in 1896. His rewritten novel—After-Dinner Conversation (De sobremesa) —wasn’t published until 1925.

6. THE ART OF GIOVANNI BATTISTA LUSIERI

The South-east Corner of the Parthenon, Athens by Giovanni Battista Lusieri
Giovanni Battista Lusieri, Wikimedia Commons // Public Domain

Giovanni Battista Lusieri was a meticulous painter of the Italian landscape, particularly its classical ruins. In large panoramas and more compact watercolors, he depicted the Acropolis, views of Rome and Naples, and, his favorite, the eruption of Mount Vesuvius. Some of his most striking works captured the volcano at night, illuminating the darkness with its orange glow. Lord Byron called him "an Italian painter of the first eminence." Yet his name is now obscure. This is partly due to the years he stopped painting to help Lord Elgin remove and ship the Parthenon Marbles to London. But when Lusieri's artwork was being sent home from Greece after his death in 1821, a shipwreck destroyed nearly half of it (including a spectacular 25-foot-long panorama of Athens), helping to ensure his fall from fame.

BONUS: PEKING MAN

A replica of the Peking Man Skull
A replica of the Peking Man Skull

When paleontologists discovered the bones of "Peking man" in a dig near Beijing in the 1920s, they were the oldest hominid fossils ever found. However, scientists can now only study the bones—thought to be about half a million years old—from casts. The Peking Man fossils were last seen in December 1941, but vanished during the Japanese occupation of China while they were being sent to the United States for safekeeping. There are many conjectures on their fate, from being secretly stored away in Japan, to being under a parking lot in China. Yet one enduring theory is that they were lost at sea on the Japanese freighter Awa Maru: In 1945, the ship was torpedoed in the Taiwan Strait by the USS Queenfish despite being guaranteed safe passage by the United States, leading to the loss of more than 2000 lives—and, it's said, the priceless Peking fossils [PDF].

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