Assistive Listening Devices in Classrooms for Children with Dyslexia

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Two reports from the Auditory Neuroscience Laboratory, Northwestern University show that Bluetooth-style listening devices in the classroom can treat dyslexia.  Sounds suspicious I know, but if nothing else, trust the source enough to read on and you’ll be suitably impressed and hopefully inspired. Their research also uncovers a biological explanation which could lead to earlier diagnosis for this language disorder. The studies were published in Journal of Neuroscience and in Proceedings of the National Academy of Sciences (links provided below).   These important findings further support an already large body of research pointing to a neural explanation for auditory processing in children with language learning problems, including dyslexia.

Assistive Listening Devices in Classrooms for Children with Dyslexia
Dyslexia is the most prevalent learning disability among children. Contrary to widespread public teaching, it is not only an affliction of the visual system; merely causing the eyes to rearrange written words.  Dyslexia stems from problems with auditory processing, a skill necessary to accurately interpret speech. Dyslexics typically have poor “phonological awareness”.  This means they struggle assigning the right sounds to the right letters. For example, they might confuse the words “bean” and “dean” because they cannot clearly distinguish the “b” and “d” sounds. Moreover, many children with poor phonological awareness suffer distractions from background noise, making it even harder to pay attention and focus on what a teacher is saying.

In the J. Neuroscience report, the authors show that poor readers have less stable auditory nervous system function than do good readers.  In the children with inconsistency in response to sound the data point to a biological mechanism and it may contribute to their reading impairment.  The authors proposed that assistive listening devices (classroom FM systems) may enhance acoustic clarity and thus reduce the auditory processing variability so elegantly described in the J.Neuroscience paper.

In the PNAS classroom study, they assessed the impact of classroom FM system use for 1 year on auditory neurophysiology and reading skills in children with dyslexia.  The results were clear and dramatic. Children with dyslexia who used classroom assistive listening devices (FM systems) had more consistent auditory brainstem responses to speech after 1 year.  This improvement was linked to increases in reading and phonological awareness. These changes were not seen for children in the same classrooms who did not use the assistive listening devices. The thinking here is that the enhanced signal-to-noise ratio provided by the FM system improved auditory brainstem function by providing the nervous system with a clearer acoustic signal. This would be particularly true for children with dyslexia who are more adversely affected by background noise than their classmates. It is important to note that the FM systems were not used during testing. The brainstem function had undergone a lasting change by enhancing signal-to-noise ratio over the course of the school year.  (Read more on Brain Plasticity)

Aside from the obvious practical implications of these findings for the home and classroom, they have provoked many questions and lines of inquiries for the research community.  Stay tuned!  Both articles are available as free full text for a closer look at the study set up and data.

J. Hornickel et al., “Assistive listening devices drive neuroplasticity in children with dyslexia,”Proceedings of the National Academy of Sciences, 32:14156-64, 2012.

J. Hornickel, N. Kraus, “Unstable representation of sound: a biological marker of dyslexia,”Journal of Neuroscience, 33:3500–04, 2013.

The Role of Sleep in Learning, Memory, and Health

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“I’ve always envied people who sleep easily. Their brains must be cleaner, the floorboards of the skull well swept, all the little monsters closed up in a steamer trunk at the foot of the bed.” ― David Benioff, City of Thieves

Recent findings in research studies related to sleep and learning lend support to some long-held hypotheses about why we sleep, what happens in the brain during sleep, and why it’s important; especially for learning. In one area of research, the findings provide evidence for a long-held hypothesis that during sleep, the brain cleans itself (1).  Another series of reports illustrate why sleep is so much more important for a child’s learning than it is for an adult.  The findings add a compelling new dimension to our current understanding of how sleep helps the brain reprocess newly learned information thus securing memories and learning (2).

Seminal studies about sleep and learning have shown unequivocally that people trained to complete a procedural memory-based task showed improved performance when a period of sleep followed the training (3).  Even a nap in the middle of the day could benefit some learning.  But to understand what is actually happening in the brain when we sleep we’ve had to wait on the right technological applications to allow us to peer into the brain and accurately measure activities and events during sleep.

Sleep is critically important to a child's learningIn the most recent report, regarding the brain’s self-cleaning mechanism, the research group provides direct evidence of specific cells active in clearing the brain of toxic metabolic byproducts – but only during sleep. Earlier work by the same group showed that the brain anatomy included a network of microscopic, fluid-filled channels that removed toxins from the brain; much like a waste-transport system for the cerebrospinal fluid (CSF). Many questions remained about how and when these channels were regulated.  The most recent studies showed quite elegantly that during sleep, the channels increased in size and flow of CSF.  Relatively large amounts of CSF were flowing through the brain during sleep, but not when awake.   They even demonstrated that certain waste product proteins, known to be associated with Alzheimer’s disease were cleared twice as quickly during sleep.  Although these studies were performed in mice, they results certainly fit with the long-standing view that sleep is for recovery.  The results are tantalizing for their possible implications for sleep disorders as related to Alzheimer’s or other neurological or neuro-developmental diseases in humans.

The other series of reports from behavioral neurobiology labs present exciting and compelling data regarding just how important sleep is for your child.   We all know that children are happier tend to behave better when they’re well-rested.  And the relationship between neurodevelopmental disorders and sleep-related problems has long been recognized.   Specifically, children with attention deficit hyperactivity disorder (ADHD) and learning disabilities (LD) or combined ADHD/LD, have a much higher rate of sleep-related difficulties and it is likely that the sleep difficulties contribute to and/or exacerbate the behavioral manifestation of these disorders (4).  But what about children not specifically diagnosed with a neuro-developmental disorder or a sleep-related problem?  How important is sleep beyond just resting the body for the next busy day of school and play?

Recent studies are showing that sleep is even more important for children than it is for adults when it comes to learning.  Dr. Ines Wilhelm at the University of Tübingen’s Institute for Medical Psychology and Behavioral Neurobiology has shown that when sleep followed training, children showed greater gains in the specific training knowledge than adults. The studies indicate that there is enhanced processing of memory during sleep in children compared to adults.  The children benefitted more from sleep when challenged with recall of specific learned tasks.

This may come as no surprise when one considers that during development of humans, as with most species, most of the basic lessons of life and survival need to occur in childhood.  Children sleep longer and deeper, and they must take on enormous amounts of information every day. And the children’s ability to excel at recall of specific learned information is linked with the large amount of deep sleep they get at night. In other types of memory, the children benefitted only as much as the adults; not more so.

If your child/student is not performing to his potential academically, you really need to look at the whole picture: healthy eating, positive social experiences, and quality, deep, undisturbed sleep at night.  If they are having trouble getting to sleep and staying asleep, this could be undermining all the other measures you’re taking to try to help them and ensure their success in school and beyond.

Therapeutic Literacy Center in Solana Beach offers assessments for learning disabilities as well programs and exercises using state of the art methods and technologies for developing underlying “mental tools” needed for success.

“Each night, when I go to sleep, I die. And the next morning, when I wake up, I am reborn.” ― Mahatma Gandhi

(1) http://www.sciencemag.org/content/342/6156/373  Science 18 October 2013: Vol. 342 no. 6156 pp. 373-377
(2) http://www.nature.com/neuro/journal/v16/n4/abs/nn.3343.html Nature Neuroscience 16 391–393 (2013)
(3) http://www.sciencemag.org/content/294/5544/1048.full Science 294, 1048 (2001); Pierre Maquet, et al.
(4) http://psycnet.apa.org/psycinfo/1998-04437-005   Journal of Developmental and Behavioral Pediatrics, Vol 19(3), Jun 1998, 178-186.

The Upside of Dyslexia?

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My son is Dyslexic and I admit that I all too often fall into the mode of lamenting that he (and my family) must ‘deal’ with his condition.  I wallow and worry about how he struggles in school and at home.  Together we suffer through the standard approaches to learning and doing things, and we spend time and money for targeted therapy and remediation.  I muse to myself that it sure would be nice to spend time and money on other endeavors instead.

People are always talking about the need to find the upside of situations, of pointing out strengths instead of weaknesses, of celebrating achievements instead of noting shortcomings.  This is supposed to be the ‘new age’ of appreciating differences and lauding what the differences bring to the table, right? At the smorgasbord of humanity should we really be complaining that all the burgers don’t have the same shape and taste?  That someone is ‘doing it wrong’?  Most of us ‘get’ this but we still fall into societal expectations (limitations?) about performance and achievement.  We keep finding ourselves spending too much time lamenting the inability to measure up.

Consider the situation of the dyslexic child who is having academic difficulties in school.  You know they’re not lazy so you get help and do everything you can to help them struggle less and feel good more often.  So What’s the Upside of Dyslexia? Is there anything else besides waiting for results to celebrate?  Waiting to say “Hooray, you’re fixed.â€

In all that waiting, I forget to remind him and myself of his unusual strengths and gifts. I KNOW Dyslexics experience the world differently and I need to find a way to appreciate that – and believe it.  But I always end up immersing myself in literature and other venues to figure out how to ‘fix’ that.  I gotta step out of that kind of thinking more often.  We all do and maybe what I found can give you a boost as well.

I recently came across the work of Dr. Matthew H. Schneps, a founding member of the Science Education Department at the Harvard-Smithsonian Center for Astrophysics.

Astrophysics?  Yes. But wait, it gets better.

Schneps founded the Laboratory for Visual Learning (LVL) to carry out research on how individual differences in neurology such as those associated with dyslexia, ADHD, and autism spectrum disorders, affect how people learn science.  His work has led to a number of spinoffs such as the development of an innovative technique for reading for people with dyslexia using mobile devices, but what I found most rewarding were the descriptions of visual advantages that dyslexics have in our world.

Dyslexics get the whole pictureFor example did you know that that many people with dyslexia have sharper peripheral vision than others?  The brain processes separately the information from the central versus the peripheral areas of the visual field.  And the brain seems to trade off on these capacities. The key to reading is being adept focusing on details located in the center of the visual field while being less proficient at recognizing features and patterns in the periphery.  As it turns out, people with dyslexia have a bias in favor of the periphery and so can quickly take in a scene as a whole; they get the “visual gist†more readily.

As an astrophysicist, Schneps and other scientists in his line of work must make sense of vast quantities of visual data and accurately detect patterns or anomalies.  He suggested that a condition of dyslexia may actually enhance the ability to carry out just such a task.  Indeed, one study he conducted showed that astrophysicists with dyslexia outperformed their non-dyslexic colleagues in assessing visual data (radiographs) to identify distinctive characteristics of black holes.  In another simple experiment, he blurred regular photographs to the extent that they resembled astronomical images.  Dyslexics easily caught on whereas typical readers failed to do so.  Still more studies demonstrate enhanced peripheral capture and whole scene capture by dyslexics as compared to non-dyslexics .

I’m only scratching the surface here and I certainly don’t want to leave anyone with the impression that we should simply ‘celebrate’ the gift of dyslexia and leave it at that.  Reading and other academic pursuits remain a real challenge for those with dyslexia and other related disabilities.  We have lifetimes of work ahead of us as we work to remediate weaknesses. But identifying the distinctive aptitudes of those with dyslexia helps us understand the condition more completely.  I plan on keeping an eye on Schneps’ work and LVL to increase my understanding and help me appreciate my son and other dyslexics for their unique abilities – not just their ability to overcome certain learning challenges.

Happy New Year!