Reading disability
Encyclopedia
A reading disability is a condition in which a sufferer displays difficulty reading resulting primarily from neurological factors. Developmental Dyslexia
Dyslexia
Dyslexia is a very broad term defining a learning disability that impairs a person's fluency or comprehension accuracy in being able to read, and which can manifest itself as a difficulty with phonological awareness, phonological decoding, orthographic coding, auditory short-term memory, or rapid...

, Alexia (acquired dyslexia)
Alexia (acquired dyslexia)
Alexia occurs when damage to the brain causes a patient to lose the ability to read...

, and Hyperlexia
Hyperlexia
Hyperlexia was initially identified by Silberg and Silberg , who defined it as the precocious ability to read words without prior training in learning to read typically before the age of 5. They indicated that children with hyperlexia have a significantly higher word decoding ability than their...

.

Definition

National Institute of Neurological Disorders and Stroke
National Institute of Neurological Disorders and Stroke
The National Institute of Neurological Disorders and Stroke is a part of the U.S. National Institutes of Health . It conducts and funds research on brain and nervous system disorders and has a budget of just over US$1.5 billion...

 defines reading disability or dyslexia as follows: "Dyslexia is a brain-based type of learning disability that specifically impairs a person's ability to read. These individuals typically read at levels significantly lower than expected despite having normal intelligence. Although the disorder varies from person to person, common characteristics among people with dyslexia are difficulty with spelling, phonological processing (the manipulation of sounds), and/or rapid visual-verbal responding. In adults, dyslexia usually occurs after a brain injury or in the context of dementia. It can also be inherited in some families, and recent studies have identified a number of genes that may predispose an individual to developing dyslexia."

Dyslexia

Dyslexia is a learning disability
Learning disability
Learning disability is a classification including several disorders in which a person has difficulty learning in a typical manner, usually caused by an unknown factor or factors...

 that manifests itself as a difficulty with reading decoding, reading comprehension and/or reading fluency. It is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or hearing, or from poor or inadequate reading instruction. It is estimated that dyslexia affects between 5-17% of the population. Dyslexia has been proposed to have three cognitive subtypes: auditory, visual and attentional. Although not an intellectual disability, it is considered both a learning disability and a reading disability.
Dyslexia and IQ
Intelligence quotient
An intelligence quotient, or IQ, is a score derived from one of several different standardized tests designed to assess intelligence. When modern IQ tests are constructed, the mean score within an age group is set to 100 and the standard deviation to 15...

 are not interrelated, since reading and cognition develop independently in individuals who have dyslexia.

Hyperlexia

Hyperlexic children are characterized by having average or above average IQs and word-reading ability well above what would be expected given their ages and IQs. Hyperlexia can be viewed as a superability in which word recognition ability goes far above expected levels of skill. Some hyperlexics, however, have trouble understanding speech. Most or perhaps all children with hyperlexia lie on the autism spectrum
Autism spectrum
The term "autism spectrum" is often used to describe disorders that are currently classified as pervasive developmental disorders. Pervasive developmental disorders include autism, Asperger syndrome, Childhood disintegrative disorder, Rett syndrome and Pervasive Developmental Disorder Not Otherwise...

. Between 5-10% of autistic children have been estimated to be hyperlexic.

See also

  • Attention deficit hyperactivity disorder
  • Alexia (acquired dyslexia)
    Alexia (acquired dyslexia)
    Alexia occurs when damage to the brain causes a patient to lose the ability to read...

  • Aphasia
    Aphasia
    Aphasia is an impairment of language ability. This class of language disorder ranges from having difficulty remembering words to being completely unable to speak, read, or write....

  • Auditory processing disorder
    Auditory processing disorder
    Auditory Processing Disorder , also known as Central Auditory Processing Disorder is an umbrella term for a variety of disorders that affect the way the brain processes auditory information. It is not a peripheral hearing disorder as individuals with APD usually have normal peripheral hearing...

  • Dyscalculia
    Dyscalculia
    Dyscalculia is a specific learning disability involving innate difficulty in learning or comprehending simple arithmetic. It is akin to dyslexia and includes difficulty in understanding numbers, learning how to manipulate numbers, learning maths facts, and a number of other related symptoms...

  • Dysgraphia
    Dysgraphia
    Dysgraphia is a deficiency in the ability to write primarily in terms of handwriting, but also in terms of coherence. It occurs regardless of the ability to read and is not due to intellectual impairment...

  • Dyslexia
    Dyslexia
    Dyslexia is a very broad term defining a learning disability that impairs a person's fluency or comprehension accuracy in being able to read, and which can manifest itself as a difficulty with phonological awareness, phonological decoding, orthographic coding, auditory short-term memory, or rapid...

  • Developmental dyspraxia
  • Hyperlexia
    Hyperlexia
    Hyperlexia was initially identified by Silberg and Silberg , who defined it as the precocious ability to read words without prior training in learning to read typically before the age of 5. They indicated that children with hyperlexia have a significantly higher word decoding ability than their...

  • Orthography
    Orthography
    The orthography of a language specifies a standardized way of using a specific writing system to write the language. Where more than one writing system is used for a language, for example Kurdish, Uyghur, Serbian or Inuktitut, there can be more than one orthography...

  • Scotopic sensitivity syndrome
    Scotopic sensitivity syndrome
    Scotopic sensitivity syndrome, also known as Irlen Syndrome and Visual Stress Syndrome, approximating in some ways to Meares Irlen syndrome, and 'Visual Stress', refers to visual perceptual disorder affecting primarily reading and writing based activities...

     (also called Irlen Syndrome)
  • Specific language impairment
    Specific language impairment
    Specific language impairment is diagnosed when a child's language does not develop normally and the difficulties cannot be accounted for by generally slow development , physical abnormality of the speech apparatus, autistic disorder, acquired brain damage or hearing loss.-Overview:Specific...

  • Writing system
    Writing system
    A writing system is a symbolic system used to represent elements or statements expressible in language.-General properties:Writing systems are distinguished from other possible symbolic communication systems in that the reader must usually understand something of the associated spoken language to...

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
x
OK