Researchers Identify a Biological Marker of Dyslexia

Learning to read proceeds smoothly for most children, but some suffer from dyslexia, a constellation of impairments unrelated to intelligence, hearing or vision that make learning to read a struggle.

Northwestern University researchers report they have found a biological mechanism that appears to play an important role in the reading process. Generally, learning to read proceeds smoothly for most children, but as many as one in 10 is estimated to suffer from dyslexia, a constellation of impairments unrelated to intelligence, hearing or vision that make learning to read a struggle.

"We discovered a systematic relationship between reading ability and the consistency with which the brain encodes sounds," says Nina Kraus, Hugh Knowles Professor of Neurobiology, Physiology and Communication. "Unstable Representation of Sound: A Biological Marker of Dyslexia," co-authored by Jane Hornickel, will appear in the Feb. 20 issue of The Journal of Neuroscience.

Dyslexia - Causes, Symptoms, Diagnosis, Treatment
Dyslexia is a reading disability that occurs when the brain does not properly recognize and process certain symbols.

Recording the automatic brain wave responses of 100 school-aged children to speech sounds, the Northwestern researchers found that the very best readers encoded the sound most consistently while the poorest readers encoded it with the greatest inconsistency. Presumably, the brain's response to sound stabilizes when children learn to successfully connect sounds with their meanings.

Happily biology is not destiny. In prior work in Northwestern's Auditory Neuroscience Laboratory, Kraus and her colleagues found that the inconsistency with which the poorest readers encode sound could be "fixed" through training.

In that study, children with reading impairments were fitted for a year with assistive listening devices that transmitted their teacher's voice directly into their ears. After a year, the children showed improvement not only in reading but also in the consistency with which their brains encoded speech sounds, particularly consonants.

Key Neural Mechanism Underlying Dyslexia Identified
Researchers have discovered faulty signal processing in brain behind dyslexia - a learning disability.

"Use of the devices focused youngsters' brains on the "meaningful" sounds coming from their teacher, diminishing other, extraneous distractions," said Kraus. "After a year of use, the students had honed their auditory systems and no longer required the assistive devices to keep their reading and encoding advantage."

People rarely have difficulty encoding vowel sounds, which are relatively simple and long, according to Kraus. It is consonant sounds -- sounds which are shorter and more acoustically complex -- that are most likely to be incorrectly categorized by the brain.

Chess Enhances Mental Ability - FIDE Trainer Speaks
Chess encourages the overall development of a person where the game prepares one to handle life with astuteness and sensibility.

"Understanding the biological mechanisms of reading puts us in a better position to both understand how normal reading works and to ameliorate it where it goes awry," says Kraus.

"Our results suggest that good readers profit from a stable neural representation of sound, and that children with inconsistent neural responses are likely at a disadvantage when learning to read," Kraus adds. "The good news is that response consistency can be improved with auditory training."

Multiple Intelligences
Gardner’s theory of Multiple intelligences is a salutation to the different types of intelligences that are inherent in humans. It has strong implications on children’s education & adult lifestyles.

Decades of research from laboratories worldwide have shown that reading ability is associated with auditory skills, including auditory memory and attention, the ability to rhyme sounds and the ability to categorize rapidly occurring sounds.

Source-Eurekalert