Navigation Links
Scientists Probe the Origins of Dyslexia
Date:12/21/2011

By Amanda Gardner
HealthDay Reporter

WEDNESDAY, Dec. 21 (HealthDay News) -- Problems in how people with dyslexia process the sounds they hear may be at the heart of this learning disorder, new research suggests.

The study findings, published in the Dec. 22 issue of the journal Neuron, may one day lead to better therapies for children and adults who are diagnosed with this common yet still ultimately mysterious condition.

And different people with dyslexia may have differences in brain-processing patterns, which could help distinguish subtypes of the disorder.

Dyslexia affects about 5 percent of school-aged children.

Although we "typically think of dyslexia as an impairment of reading or the printed word, previous research has suggested that there's an auditory-processing component. . . It's not just the printed word but also auditory," said Dr. Andrew Adesman, who was not involved with the study but is familiar with the findings.

Indeed, one of the biggest risk factors for dyslexia is delays in spoken language in young children, said Adesman, chief of developmental and behavioral pediatrics at the Steven & Alexandra Cohen Children's Medical Center of New York, in New Hyde Park.

Previous brain imaging studies had shown abnormal processing of brief sounds in people with dyslexia, but it has been unclear what the neurophysiological mechanism was behind the abnormalities, according to study authors Katia Lehongre, from the Ecole Normale Superieure in Paris, and colleagues.

The French authors focused on a phenomenon called "sampling," which refers to how the brain initially responds to sounds. Specifically, sampling involves the processing of phonemes, which are the basic elements of sound.

"They're looking at where and how sound is processed," Adesman explained.

What the investigators found in people with dyslexia, as compared to people who did not have dyslexia (control-group members), were abnormalities in the left auditory cortex of the brain.

The brains of people with dyslexia may "overreact" to phonemes at high-frequency rhythms. This could interfere with verbal memory and, hence, speech, the study found.

"The left auditory cortex may be less responsive to certain sound frequencies that are optimal [for processing] phonemes," Adesman explained.

Although the research is "important," said Dr. Harold Levinson, clinical/research director of the Levinson Medical Center for Learning Disabilities in Great Neck, N.Y., it may not take into account the complexity of dyslexia and the many brain processes involved.

The particular brain abnormalities identified in this study may just be a reflection of other problems in the cerebellum region of the brain, he said.

A number of questions remained unanswered, Levinson added.

More information

The U.S. National Library of Medicine has more on dyslexia.

SOURCES: Andrew Adesman, M.D., chief, developmental and behavioral pediatrics, Steven & Alexandra Cohen Children's Medical Center of New York, New Hyde Park, N.Y.; Harold Levinson, M.D., clinical/research director, Levinson Medical Center for Learning Disabilities, Great Neck, N.Y.; Dec. 22, 2011, Neuron


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Scientists Pinpoint Area of Brain That Fears Losing Money
2. Scientists Discover How HIV Is Transmitted Between Men
3. Prevention Is Key Research Goal for Premature Babies, Scientists Say
4. Scientists Discover Molecular Pathway for Organ Tissue Regeneration and Repair
5. Scientists find donut-shaped structure of enzyme involved in energy metabolism
6. Neuroscientists reveal new links that regulate brain electrical activity
7. Two UCSF Scientists to Receive Prestigious Dementia Research Honor
8. Johns Hopkins scientists develop personalized blood tests for cancer using whole genome sequencing
9. Scientists Spot Genetic Fingerprints of Individual Cancers
10. Scientists Unravel Mysteries of Intelligence
11. MSU scientists develop more effective method of predicting lead-poisoning risk
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Scientists Probe the Origins of Dyslexia
(Date:8/23/2017)... TX (PRWEB) , ... August 23, 2017 , ... ... in the healthcare industry, made the 2017 Inc. 5000 with a three-year ... of the nation’s fastest-growing private companies and comprises the most comprehensive look at ...
(Date:8/23/2017)... Francisco, CA (PRWEB) , ... August 23, 2017 , ... ... proud to announce a new blog archive organized month-by-month. The new rotation of archived ... treatments. Local Bay Area residents searching information about hair transplantation can review details online ...
(Date:8/22/2017)... ... August 22, 2017 , ... ... of unique masks and serums that perfectly fuse the beauty of naturally derived ... the 2017 Indie Beauty Expo on August 23rd & 24th in New York ...
(Date:8/22/2017)... , ... August 22, 2017 , ... Each of the past six years, Lightning Labels ... pictures of these labels and stickers, demonstrating the variety and creativity of their designs. Submissions ... label images came in. Now, it's time to announce the winners of the sixth annual ...
(Date:8/22/2017)... ... August 22, 2017 , ... “Wilderness Voices”: a collection of ... “Wilderness Voices” is the creation of published author, Martha McKown, an ordained United ... inspired as a very young child when her older sisters studied High School literature. ...
Breaking Medicine News(10 mins):
(Date:8/15/2017)... 15, 2017   Mostyn Law and Gulf Coast Regional ... Texas . The Mostyn Law family has had ... That is why Mostyn Law is partnering with Gulf ... show its appreciation. Blood supplies are running low. Gulf ... of hospital needs in August. That is why the blood center ...
(Date:8/14/2017)... Israel , Aug. 15, 2017  BrainStorm ... adult stem cell technologies for neurodegenerative diseases, announced financial ... "We are in ... 3 trial to investigate NurOwn ® in ALS," ... Officer of BrainStorm. "We have agreements with Mass. General ...
(Date:8/7/2017)... Aug. 7, 2017 Insightin Health, provider ... retention, and engagement, announced the selection of ... Product Development, effective as of February 2017. In this ... implementation strategy for our clients. Wood brings with ... consulting and business analytics within the healthcare industry. ...
Breaking Medicine Technology: