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:12/8/2016)... ... , ... STAT courier is pleased to announce that due to customer demand, ... expanding their presence in Dallas. One of the most exciting parts for STAT is ... the Dallas and Forth Worth market. STAT takes pride in treating their employees with ...
(Date:12/8/2016)... ... December 08, 2016 , ... Vida Health, the digital health ... led by Canvas Ventures . Other investors include Nokia Growth Partners (NGP) and ... to serve more consumers who are managing chronic conditions or simply want ...
(Date:12/8/2016)... ... December 08, 2016 , ... Peter Zipp Insurance, an ... around the greater Phoenix metropolitan region, is announcing a charity event to provide ... the Homeless Youth Connection is to promote community awareness of the ongoing needs ...
(Date:12/8/2016)... ... 08, 2016 , ... Bill Mull Agencies, a Wichita-based firm ... around central Kansas, is joining the Youth Horizons organization for a charity event ... in Wichita, Youth Horizons works to empower area children from unstable, troubled, or ...
(Date:12/7/2016)... ... , ... Kenall Manufacturing, a leader in sealed healthcare lighting for more than ... multi-function, sealed, LED luminaire that meets the needs of everyone in the patient room ... , A 2’ x 4’ model features four modes: reading, ambient, standard and ...
Breaking Medicine News(10 mins):
(Date:12/8/2016)... 8, 2016  Boehringer Ingelheim announced today that it ... (CEI). This is the ninth time that the company ... a Best Place to Work for LGBT Equality. Administered ... a national benchmarking report on corporate policies and practices ... transgender (LGBT) employees. "We are committed ...
(Date:12/8/2016)... , December 8, 2016 ... "Sugar-Based Excipients Market by Product (Actual Sugars, Sugar ... (Filler & Diluent, Tonicity Agents), Formulation (Oral, Topical, ... MarketsandMarkets, the market has witnessed healthy growth during ... at a CAGR of 4.3% between 2016 and ...
(Date:12/8/2016)... 2016 According to a new market research report ... Therapeutic (Pain, Insulin)), End Use (Sports, Fitness, RPM), Type (Smart watch, Patch), ... global market, in terms of value, is projected to reach 12.14 Billion ... 18.0% during the forecast period. Continue Reading ... ...
Breaking Medicine Technology: