Dyslexia Not Correlated to IQ

January 4, 2010 by Geoff Nixon

Dyslexia Yale Study Results

We were interested to read the recent results of a Yale study of 445 CT children over twelve years which concludes dyslexia is not correlated to IQ. 

At Gemm Learning we have always felt this to be true.  We feel pretty much everyone can read well, regardless of IQ.   Decoding text on a page requires lightning speed subconscious processing skills not unlike the hand to eye skills required to hit a baseball. 

Reading requires sound cognitive skills — auditory processing so that sounds can be heard separately as phonemes for decoding, sequencing so that words can be spelled and words in a line understood, working memory so that words can be retained and meaning extracted, etc.

The study finds a correlation between reading and IQ for good readers, but not between dyslexia and IQ.  The good reader correlation says more about the impact of IQ in reading comprehension than in the learning to read process.

The fact is the acquisition of the cognitive skills required for reading are not related to IQ eventually.  In the early stages of reading a high IQ can actually be problematical in fact!  Bright kids are able to muster a bunch of coping strategies and awesome memory powers to make it appear that they are reading — decoding to please their parents — when they are not.

So in the early stages IQ can matter —  it can hurt.  But eventually, readers need to develop sound cognitive skills, learning skills unrelated to smarts.  Isn’t this great news for all kids, as it suggests what we know to be true.  Everyone can learn to read well, regardless of IQ.

Article as first reported here:

http://www.medicalnewstoday.com/articles/174488.php

Article:   (January 1, 2010).   Contrary to popular belief, some very smart, accomplished people cannot read well. This unexpected difficulty in reading in relation to intelligence, education and professional status is called dyslexia, and researchers at Yale School of Medicine and University of California Davis, have presented new data that explain how otherwise bright and intelligent people struggle to read.

The study, which will be published in the January 1, 2010 issue of the journal Psychological Science,provides a validated definition of dyslexia. “For the first time, we’ve found empirical evidence that shows the relationship between IQ and reading over time differs for typical compared to dyslexic readers,” said Sally E. Shaywitz, M.D., the Audrey G. Ratner Professor in Learning Development at Yale School of Medicine’s Department of Pediatrics, and co-director of the newly formed Yale Center for Dyslexia and Creativity.

Using data from the Connecticut Longitudinal Study, an ongoing 12-year study of cognitive and behavioral development in a representative sample of 445 Connecticut schoolchildren, Shaywitz and her team tested each child in reading every year and tested for IQ every other year. They were looking for evidence to show how the dissociation between cognitive ability and reading ability might develop in children.

The researchers found that in typical readers, IQ and reading not only track together, but also influence each other over time. But in children with dyslexia, IQ and reading are not linked over time and do not influence one another. This explains why a dyslexic can be both bright and not read well.

“I’ve seen so many children who are struggling to read but have a high IQ,” said Shaywitz. “Our findings of an uncoupling between IQ and reading, and the influence of this uncoupling on the developmental trajectory of reading, provide evidence to support the concept that dyslexia is an unexpected difficulty with reading in children who otherwise have the intelligence to learn to read.”

Typical readers learn how to associate letters with a specific sound. “All they have to do is look at the letters and it’s automatic,” Shaywitz explained. “It’s like breathing; you don’t have to tell your lungs to take in air. In dyslexia, this process remains manual.” Each time a dyslexic sees a word, it’s as if they’ve never seen it before. People with dyslexia have to read slowly, re-read, and sometimes use a marker so they don’t lose their place.

“A key characteristic of dyslexia is that the unexpected difficulty refers to a disparity within the person rather than, for example, a relative weakness compared to the general population,” said co-author Bennett A. Shaywitz, M.D., the Charles and Helen Schwab Professor in Dyslexia and Learning Development and co-director of the Yale Center for Dyslexia and Creativity.

Sally Shaywitz estimates that one in five people are dyslexic and points to many accomplished writers, physicians and attorneys with dyslexia who struggle with the condition in their daily lives, including Carol Greider, the 2009 Nobel laureate in medicine. She hopes to dispel many of the myths surrounding the condition.

“High-performing dyslexics are very intelligent, often out-of-the box thinkers and problem-solvers,” she said. “The neural signature for dyslexia is seen in children and adults. You don’t outgrow dyslexia. Once you’re diagnosed, it is with you for life.”

Shaywitz also stresses that the problem is with both basic spoken and written language. People with dyslexia take a long time to retrieve words, so they might not speak or read as fluidly as others. In students, the time pressure around standardized tests like the SATs and entrance exams for professional schools increases anxiety and can make dyslexia worse, so the need for accommodations is key in helping those with the disorder realize their potential, she says.

Other authors on the study include Emilio Ferrer at the University of California Davis and John M. Holahan and Karen Marchione at Yale School of Medicine.

The study was funded by the National Institute of Child Health and Human Development, the National Science Foundation, and the National Institute of Neurological Disorders and Stroke.

Citation: