The earliest documented cases of dyslexia, or a language processing disorder that makes it difficult to read, date back more than a century. For decades, it was considered a relatively rare occurrence, but today it is estimated that up to 20 percent of the US population is dyslexic. What is going on?
Advances in childhood diagnosis and treatment of dyslexia have certainly led to higher rates, but that is only part of the story. A national effort over the past two decades to push children to read at ever earlier ages—before many of them may be developmentally ready to do so—is also a likely culprit.
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