Listen Up: Abnormality In Auditory Processing Underlies Dyslexia
Cell Press. (2012, January 2). "Listen Up: Abnormality In Auditory Processing Underlies Dyslexia." Medical News Today.
People with dyslexia often struggle with the ability to accurately decode and identify what they read. Although disrupted processing of speech sounds has been implicated in the underlying pathology of dyslexia, the basis of this disruption and how it interferes with reading comprehension has not been fully explained. Now, new research published by Cell Press in the December 22 issue of the journal Neuron finds that a specific abnormality in the processing of auditory signals accounts for the main symptoms of dyslexia.
"It is widely agreed that for a majority of dyslexic children, the main cause is related to a deficit in the processing of speech sounds," explains senior study author, Dr. Anne-Lise Giraud and Franck Ramus from the Ecole Normale Supérieure in Paris, France. "It is also well established that there are three main symptoms of this deficit: difficulty paying attention to individual speech sounds, a limited ability to repeat a list of pseudowords or numbers, and a slow performance when asked to name a series of pictures, colors, or numbers as quickly as possible. However, the underlying basis of these symptoms has not been elucidated."
Dr. Giraud and colleagues examined whether an abnormality in the early steps of auditory processing in the brain, called "sampling," is linked with dyslexia by focusing on the idea that an anomaly in the initial processing of phonemes, the smallest units of sound that can be used to make a word, might have a direct impact on the processing of speech.
The researchers found that typical brain processing of auditory rhythms associated with phonemes was disrupted in the left auditory cortex of dyslexics and that this deficit correlated with measures of speech sound processing. Further, dyslexics exhibited an enhanced response to high-frequency rhythms that indirectly interfered with verbal memory. It is possible that this "oversampling" might result in a distortion of the representation of speech sounds.
"Our results suggest that the left auditory cortex of dyslexic people may be less responsive to modulations at very specific frequencies that are optimal for analysis of speech sounds and overly responsive to higher frequencies, which is potentially detrimental to their verbal short-term memory abilities," concludes Dr. Giraud. "Taken together, our data suggest that the auditory cortex of dyslexic individuals is less fine-tuned to the specific needs of speech processing."
Kasting Connections' Perspective:
This brief article states what I've known to be true for a while. What it doesn't state is that there are some ways to improve auditory processing.
In the clinic setting, I have been successful in using a three prong approach:
1) Occupational Therapy -Sensory Integration Approach:
Find an occupational therapist that has been trained in Sensory Integration, maybe through The STAR Center in Denver, Colorado via a mentor ship given by the top O.T. in the field, Dr. Lucy Jane Miller or maybe through S.I.P.T training. The O.T. should have sought out extra training that what was given in school. Ask about their experience, look at their sensory gym space. It should have at least 6 to 8 ceiling hooks that equipment can hang from and rotate 360 degrees. Their gym should have many options available for fine motor, gross motor, auditory processing, visual processing, etc. Ask if they are trained in astronaut training through Dr. Sheila Frick (Vital Links) which uses a spinning protocol to help the vestibular system improve along with the connection to eye movement needed for reading!
The use of Listening Therapy retrains the brain how to take in sensory information through all the senses and teaches the brain how to efficiently process the sensory information. We have had great success with students of all ages. There are several listening therapies out there; I would recommend the use of 3: Vital Links, Samonas, and Integrated Listening Systems.
3) Direct Academic intervention:
I have used Phonological Awareness Kit from Lingui Systems as a step to help students with auditory discrimination issues. In conjunction with that curriculum, I have used Earobics Software for all ages to give students an engaging way to work on auditory processing skills. If that software is too expensive for you, a reasonable alternative is Hear Builder: Phonological Awareness through Super Duper Publications.
Good Luck and let me know how your interventions are working!
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