The study, funded by the National Institutes of Health, was undertaken because many educators diagnose dyslexia based on a lag between reading scores and overall IQ scores. Researchers, led by Dr. Fumiko Hoeft at Stanford University, measured brain activity in 131 children ages 7 to 16. The group reflected a range of reading abilities and IQ scores, but evidence of dyslexia was shown to be independent of IQ score.
If IQ score is abandoned as a way to diagnose dyslexia, more children with lower-than-average IQs who have trouble reading should get needed reading-comprehension services.
“The evidence indicates that any child with a reading difficulty, regardless of his or her general level of cognitive abilities (IQ), should be encouraged to seek reading intervention,” the authors wrote.