Dyslexia is a type of language-based learning disability that interferes with the ability to read and understand printed text.
Many people with dyslexia have trouble reading words accurately. They may reverse letters (b/d), invert letters (b/p), or transpose letters (on/no). Because they read words incorrectly, they misunderstand the meaning of the text.
Some people with dyslexia may read words correctly "in isolation" (when the words are presented one at a time, as in a list) but misread words in the context of a sentence or paragraph. They may substitute similar-looking or similar-sounding words for the words printed on the page.
Most researchers believe that dyslexia is caused by problems with the brain's processing of language-related information. People with dyslexia may have trouble hearing the differences between similar-sounding words, or may have trouble remembering which sounds go with which letters. Because reading and spelling both rely on language processing abilities, people with dyslexia often show spelling problems in addition to their reading deficits.
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