Navigation Links
In dyslexia, less brain tissue not to blame for reading difficulties
Date:1/14/2014

WASHINGTON In people with dyslexia, less gray matter in the brain has been linked to reading disabilities, but now new evidence suggests this is a consequence of poorer reading experiences and not the root cause of the disorder.

It has been assumed that the difference in the amount of gray matter might, in part, explain why dyslexic children have difficulties correctly and fluently mapping the sounds in words to their written counterparts during reading. But this assumption of causality has now been turned on its head.

The findings from anatomical brain studies conducted at Georgetown University Medical Center (GUMC) in the Center for the Study of Learning led by neuroscientist Guinevere Eden, DPhil, were published online today in The Journal of Neuroscience.

The study compared a group of dyslexic children with two different control groups: an age-matched group included in most previous studies, and a group of younger children who were matched at the same reading level as the children with dyslexia.

"This kind of approach allows us to control for both age as well as reading experience," explains Eden, a professor of pediatrics at GUMC. "If the differences in brain anatomy in dyslexia were seen in comparison with both control groups, it would have suggested that reduced gray matter reflects an underlying cause of the reading deficit. But that's not what we observed."

The dyslexic groups showed less gray matter compared with a control group matched by age, consistent with previous findings. However, the result was not replicated when a control group matched by reading level was used as the comparison group with the dyslexics.

"This suggests that the anatomical differences reported in left hemisphere language processing regions appear to be a consequence of reading experience as opposed to a cause of dyslexia," says Anthony Krafnick, PhD, lead author of the publication. "These results have an impact on how we interpret the previous anatomical literature on dyslexia and it suggests the use of anatomical MRI would not be a suitable way to identify children with dyslexia," he says.

The work also helps to determine the fine line between experience-induced changes in the brain and differences that are the cause of cognitive impairment. For example, it is known from studies in illiterate people who attain reading skills as adults that this type of learning induces growth of brain matter. Similar learning-induced changes in typical readers may result in discrepancies between them and their dyslexic peers, who have not enjoyed the same reading experiences and thus have not undergone similar changes in brain structure.


'/>"/>

Contact: Karen Teber
km463@georgetown.edu
Georgetown University Medical Center
Source:Eurekalert

Related medicine news :

1. Study Suggests Vaccine May Help Kids With Brain Cancer
2. Epilepsy Leads to More Brain Abnormalities Over Time
3. UCLA Brain Injury Research Center gets NCAA funding for research on sports concussions
4. Why is traumatic brain injury increasing among the elderly?
5. Brain Falters Near End of Life, but Games, Puzzles Might Slow Decline
6. Dental X-Rays May Be Linked to Benign Brain Tumors
7. Nonsurgical Method to Measure Brain Pressure Shows Promise
8. Researchers Map Brain Regions Linked to Intelligence
9. Football-related catastrophic brain injuries on the rise
10. Brain Tumor Vaccine Shows Promise in Early Trial
11. Brain Surgery Might Ease Tough-to-Treat OCD
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/25/2016)... ... June 25, 2016 , ... Experts from ... at AcademyHealth’s Annual Research Meeting June 26-28, 2016, at the Hynes Convention Center ... care topics including advance care planning, healthcare costs and patient and family engagement. ...
(Date:6/25/2016)... ... June 25, 2016 , ... As a lifelong Southern Californian, Dr. Omkar Marathe ... from the David Geffen School of Medicine at UCLA. He trained in Internal Medicine ... his fellowship in hematology/oncology at the UCLA-Olive View-Cedars Sinai program where he had the ...
(Date:6/24/2016)... , ... June 24, 2016 , ... Those who have ... these feelings, many turn to unhealthy avenues, such as drug or alcohol abuse, as ... Michigan, has released tools for healthy coping following a traumatic event. , Trauma sufferers ...
(Date:6/24/2016)... San Francisco, CA (PRWEB) , ... June 24, ... ... at CitiDent, is now offering micro-osteoperforation for accelerated orthodontic treatment. Dr. Cheng has ... , self-ligating Damon brackets , AcceleDent, and accelerated osteogenic orthodontics. , ...
(Date:6/24/2016)... NY (PRWEB) , ... June 24, 2016 , ... ... Haute Living, is proud to recognize Dr. Barry M. Weintraub as a prominent ... “the most beautiful women in the world, and the most handsome men, look ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... 2016  Collagen Matrix, Inc., ("Collagen Matrix") the ... of collagen and mineral based medical devices for ... Bill Messer has joined the company as ... the growing portfolio of oral surgery, neurosurgery, orthopaedic ... joins the Collagen Matrix executive team as an ...
(Date:6/24/2016)... -- The Academy of Managed Care Pharmacy (AMCP) today ... allow biopharmaceutical companies to more easily share health care ... coverage decisions, a move that addresses the growing need ... The recommendations address restrictions in the sharing of product ... a prohibition that hinders decision makers from accessing HCEI ...
(Date:6/24/2016)... --  Pulmatrix, Inc ., (NASDAQ: PULM ), ... today that it was added to the Russell Microcap ... set of U.S. and global equity indexes on June ... for Pulmatrix," said Chief Executive Officer Robert Clarke ... in developing drugs for crucial unmet medical needs, and ...
Breaking Medicine Technology: