Classification Computerized tomography (CT) scan showing brain multiple frontal, parietal, and temporal lobe lesions. The cause of<unk>  is damage in the left hemisphere of the brain<unk>  is usually classified as an acquired reading disorder, as opposed to a developmental dyslexia, in previously literate adults as a consequence of a brain injury. However, recently, developmental<unk>  has also been reported in children with Williams syndrome.<unk>  is considered to be a "central dyslexia" as compared to a "peripheral dyslexia". Peripheral dyslexics have difficulty matching the visual characteristics of letters that comprise a word to a stored memory of this word from prior encounters. Central dyslexics are unable to properly match the visual word to the word's meaning. They may also be incapable of speaking, or phonating, the sequence of written letters that they see into the word these letters represent.<unk>  differs from other forms of central dyslexia (phonological dyslexia and surface dyslexia) in that<unk> s have many more symptoms and these symptoms are generally more severe. According to the "continuum" hypothesis,<unk>  is a more severe form of phonological dyslexia.
Deep dyslexia
Surface dyslexia
Phonological dyslexia
Specific language impairment
Global developmental delay
Nonverbal learning disorder
Intellectual disability
Nonverbal autism