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Dyslexia Facts

What is dyslexia?

  • Dyslexia is a specific learning disability that is neurological in origin.

It is characterized by difficulties with accurate and / or fluent word recognition and by poor spelling and decoding abilities.

  • ›These difficulties typically result from a deficit in the phonological component of language that is often unexpected in relation to other cognitive abilities and the provision of effective classroom instruction.
  • ›Secondary consequences may include problems in reading comprehension and reduced reading experience that can impede growth of vocabulary and background knowledge.
  • Adopted by the IDA Board of Directors, Nov. 12, 2002. This Definition is also used by the National Institute of Child Health and Human Development (NICHD).

What causes dyslexia?

  • The exact causes of dyslexia are still not completely clear, but anatomical and brain imagery studies show differences in the way the brain of a dyslexic person develops and functions.
  • Moreover, most people with dyslexia have been found to have problems with identifying the separate speech sounds within a word and/or learning how letters represent those sounds, a key factor in their reading difficulties.

How many students have dyslexia?

  • Various sources report that between 5 and 20% of all students have dyslexia.
  • There is no standardized identification system and no clear definition.
  • Overlapping conditions confuse the data further.