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Dyslexia, previously known as word blindness, is a learning disability that affects either reading or writing. Different people are affected to different degrees. Problems may include difficulties in spelling words, reading quickly, writing words, "sounding out" words in the head, pronouncing words when reading aloud and understanding what one ...
Letter addition/subtraction - People with dyslexia may perceive a word with letters added, subtracted, or repeated. This can lead to confusion between two words containing most of the same letters. Highly phoneticized spelling - People with dyslexia also commonly spell words inconsistently, but in a highly phonetic form, such as writing "shud ...
Strephosymbolia was Samuel Orton's theory of dyslexia which he first published in 1925. The root strepho is Ancient Greek for "twisted" or "reversed" and he used this in preference to the phrase "word blindness", which he thought inaccurate as the difficulty was not that those with strephosymbolia could not see the words but that they had difficulty comprehending them.
Dyslexia is a common language-based learning disability. Dyslexia can affect reading fluency, decoding, reading comprehension, recall, writing, spelling, and sometimes speech and can exist along with other related disorders. [15] The greatest difficult those with the disorder have is with spoken and the written word.
The word is drawn from the Greek prefix δυσ- (dus-), "hard, bad, difficult" [6] + λέξις (lexis), "speech, word". [ 7 ] [ 8 ] He used the term to refer to a case of a young boy who had a severe impairment in learning to read and write in spite of showing typical intellectual and physical abilities in all other respects.
For these dyslexic readers, learning to decode words may take a long time—indeed, in the deepest orthographies a distinctive symptom of dyslexia is the inability to read at the word level—but many dyslexic readers have fewer problems with fluency and comprehension once some level of decoding has been mastered.
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Dyslexia that develops due to a traumatic brain injury, stroke, or dementia is sometimes called "acquired dyslexia" [1] or alexia. [3] The underlying mechanisms of dyslexia result from differences within the brain's language processing. [3] Dyslexia is diagnosed through a series of tests of memory, vision, spelling, and reading skills. [4]