Featured Research

from universities, journals, and other organizations

Dyslexia Varies Across Languages

Date:
October 13, 2009
Source:
Cell Press
Summary:
Chinese-speaking children with dyslexia have a disorder that is distinctly different, and perhaps more complicated and severe, than that of English speakers. Those differences can be seen in the brain and in the performance of Chinese children on visual and oral language tasks, reveals a new report.

Chinese-speaking children with dyslexia have a disorder that is distinctly different, and perhaps more complicated and severe, than that of English speakers. Those differences can be seen in the brain and in the performance of Chinese children on visual and oral language tasks, reveals a report published online on October 12th in Current Biology.

Related Articles


English dyslexia consists of a "phonological disorder," meaning that people with the condition have trouble detecting or manipulating the sound structure of oral language, which in turn leads to problems in mapping speech sounds onto letters, explained Wai Ting Siok of the University of Hong Kong. In contrast, the new findings show that developmental dyslexia in Chinese is really two disorders: a visuospatial deficit and a phonological disorder combined.

Siok and her colleague Li Hai Tan say the difference can be traced to the characteristics of the two languages. "In English, the alphabetic letters that form visual words are pronounceable, so access to the pronunciation of English words is made possible by using letter-to-sound conversion rules," Siok said. "Written Chinese maps graphic forms—i.e., characters—onto meanings; Chinese characters possess a number of intricate strokes packed into a square configuration, and their pronunciations must be memorized by rote. This characteristic suggests that a fine-grained visuospatial analysis must be performed by the visual system in order to activate the characters' phonological and semantic information. Consequently, disordered phonological processing may commonly coexist with abnormal visuospatial processing in Chinese dyslexia."

The researchers asked normal and dyslexic Chinese readers to judge the physical size of visual stimuli and found that normal readers performed significantly better than dyslexic readers. Brain scans showed that, compared with normal readers, dyslexics exhibited weaker activation in a portion of the brain known to mediate visuospatial processing. Crucially, Siok said, most Chinese dyslexics with the visuospatial problem also exhibited a phonological processing disorder, as demonstrated by their poor performance in a phonology-related rhyme judgment task, suggesting the coexistence of two disorders.

"Our study for the first time demonstrates the coexistence of visuospatial and phonological disorders in dyslexics," which presents a challenge to current theories to explain developmental dyslexia, Tan said. "Our results strongly indicate the need for a unifying theory of sufficient scope to accommodate the full complexity of the observed dysfunctions and interactions of the brain systems underlying reading impairments."

The researchers include Wai Ting Siok, The University of Hong Kong, Hong Kong, China; John A. Spinks, The University of Hong Kong, Hong Kong, China; Zhen Jin, Beijing Hospital, Beijing, China; and Li Hai Tan, The University of Hong Kong, Hong Kong, China.


Story Source:

The above story is based on materials provided by Cell Press. Note: Materials may be edited for content and length.


Cite This Page:

Cell Press. "Dyslexia Varies Across Languages." ScienceDaily. ScienceDaily, 13 October 2009. <www.sciencedaily.com/releases/2009/10/091012121333.htm>.
Cell Press. (2009, October 13). Dyslexia Varies Across Languages. ScienceDaily. Retrieved January 30, 2015 from www.sciencedaily.com/releases/2009/10/091012121333.htm
Cell Press. "Dyslexia Varies Across Languages." ScienceDaily. www.sciencedaily.com/releases/2009/10/091012121333.htm (accessed January 30, 2015).

Share This


More From ScienceDaily



More Mind & Brain News

Friday, January 30, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Binge-Watching TV Linked To Loneliness

Binge-Watching TV Linked To Loneliness

Newsy (Jan. 29, 2015) Researchers at University of Texas at Austin found a link between binge-watching TV shows and feelings of loneliness and depression. Video provided by Newsy
Powered by NewsLook.com
Signs You Might Be The Passive Aggressive Friend

Signs You Might Be The Passive Aggressive Friend

BuzzFeed (Jan. 28, 2015) "No, I&apos;m not mad. Why, are you mad?" Video provided by BuzzFeed
Powered by NewsLook.com
City Divided: A Look at Model Schools in the TDSB

City Divided: A Look at Model Schools in the TDSB

The Toronto Star (Jan. 27, 2015) Model schools are rethinking how they engage with the community to help enhance the lives of the students and their parents. Video provided by The Toronto Star
Powered by NewsLook.com
Man Saves Pennies For 65 Years

Man Saves Pennies For 65 Years

Rooftop Comedy (Jan. 26, 2015) A man in Texas saved every penny he found for 65 years, and this week he finally cashed them in. Bank tellers at Prosperity Bank in Slaton, Texas were shocked when Ira Keys arrived at their bank with over 500 pounds of loose pennies stored in coffee cans. After more than an hour of sorting and counting, it turned out the 81 year-old was in possession of 81,600 pennies, or $816. And he&apos;s got more at home! Video provided by Rooftop Comedy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins