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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 reads. Often these difficulties are first noticed at school. The difficulties are involuntary, and people with this disorder have a normal desire to learn. People with dyslexia have higher rates of attention deficit hyperactivity disorder (ADHD), developmental language disorders, and difficulties with numbers.
Whole language is a philosophy of reading and a discredited educational method originally developed for teaching literacy in English to young children. The method became a major model for education in the United States, Canada, New Zealand, and the UK in the 1980s and 1990s, despite there being no scientific support for the method's effectiveness. It is based on the premise that learning to read English comes naturally to humans, especially young children, in the same way that learning to speak develops naturally.
Phonics is a method for teaching people how to read and write an alphabetic language. It is done by demonstrating the relationship between the sounds of the spoken language (phonemes), and the letters or groups of letters (graphemes) or syllables of the written language. In English, this is also known as the alphabetic principle or the alphabetic code.
Reading for special needs has become an area of interest as the understanding of reading has improved. Teaching children with special needs how to read was not historically pursued due to perspectives of a Reading Readiness model. This model assumes that a reader must learn to read in a hierarchical manner such that one skill must be mastered before learning the next skill. This approach often led to teaching sub-skills of reading in a decontextualized manner. This style of teaching made it difficult for children to master these early skills, and as a result, did not advance to more advanced literacy instruction and often continued to receive age-inappropriate instruction.
Phonological awareness is an individual's awareness of the phonological structure, or sound structure, of words. Phonological awareness is an important and reliable predictor of later reading ability and has, therefore, been the focus of much research.
Synthetic phonics, also known as blended phonics or inductive phonics, is a method of teaching English reading which first teaches the letter sounds and then builds up to blending these sounds together to achieve full pronunciation of whole words.
A reading disability is a condition in which a person displays difficulty reading. Examples of reading disabilities include: developmental dyslexia, alexia, and hyperlexia.
The Geschwind–Galaburda hypothesis is a neurological theory proposed by Norman Geschwind and Albert Galaburda in 1987. The hypothesis posits there are sex differences in cognitive abilities by relating them to lateralisation of brain function. The maturation rates of cerebral hemispheres differ and are mediated by circuiting testosterone levels, which are substantially influenced during the foetal and post-puberty development stages.
Samuel Torrey Orton was an American physician who pioneered the study of learning disabilities. He examined the causes and treatment of dyslexia.
Management of dyslexia depends on a multiple of variables; there is no one specific strategy or set of strategies that will work for all who have dyslexia.
Deep dyslexia is a form of dyslexia that disrupts reading processes. Deep dyslexia may occur as a result of a head injury, stroke, disease, or operation. This injury results in the occurrence of semantic errors during reading and the impairment of nonword reading.
Analytic phonics refers to a very common approach to the teaching of reading that starts at the word level, not at the sound (phoneme) level. It does not teach the blending of sounds together as is done in synthetic phonics. One method is to have students identify a common sound in a set of words that each contain that same sound. For example, the teacher and student discuss how the following words are alike: pat, park, push and pen. Analytic phonics is often taught together with levelled-reading books, look-say practice, and the use of aids such as phonics worksheets.
Reading is the process of taking in the sense or meaning of letters, symbols, etc., especially by sight or touch.
The history of dyslexia research spans from the late 1800s to the present.
Dyslexia is a reading disorder wherein an individual experiences trouble with reading. Individuals with dyslexia have normal levels of intelligence but can exhibit difficulties with spelling, reading fluency, pronunciation, "sounding out" words, writing out words, and reading comprehension. The neurological nature and underlying causes of dyslexia are an active area of research. However, some experts believe that the distinction of dyslexia as a separate reading disorder and therefore recognized disability is a topic of some controversy.
Dyslexia is a complex, lifelong disorder involving difficulty in learning to read or interpret words, letters and other symbols. Dyslexia does not affect general intelligence, but is often co-diagnosed with ADHD. There are at least three sub-types of dyslexia that have been recognized by researchers: orthographic, or surface dyslexia, phonological dyslexia and mixed dyslexia where individuals exhibit symptoms of both orthographic and phonological dyslexia. Studies have shown that dyslexia is genetic and can be passed down through families, but it is important to note that, although a genetic disorder, there is no specific locus in the brain for reading and writing. The human brain does have language centers, but written language is a cultural artifact, and a very complex one requiring brain regions designed to recognize and interpret written symbols as representations of language in rapid synchronization. The complexity of the system and the lack of genetic predisposition for it is one possible explanation for the difficulty in acquiring and understanding written language.
Dyslexia is a disorder characterized by problems with the visual notation of speech, which in most languages of European origin are problems with alphabet writing systems which have a phonetic construction. Examples of these issues can be problems speaking in full sentences, problems correctly articulating Rs and Ls as well as Ms and Ns, mixing up sounds in multi-syllabic words, problems of immature speech such as "wed and gween" instead of "red and green".
Rapid automatized naming (RAN) is a task that measures how quickly individuals can name aloud objects, pictures, colors, or symbols. Variations in rapid automatized naming time in children provide a strong predictor of their later ability to read, and is independent from other predictors such as phonological awareness, verbal IQ, and existing reading skills. Importantly, rapid automatized naming of pictures and letters can predict later reading abilities for pre-literate children.
Phonological dyslexia is a reading disability that is a form of alexia, resulting from brain injury, stroke, or progressive illness and that affects previously acquired reading abilities. The major distinguishing symptom of acquired phonological dyslexia is that a selective impairment of the ability to read pronounceable non-words occurs although the ability to read familiar words is not affected. It has also been found that the ability to read non-words can be improved if the non-words belong to a family of pseudohomophones.
The dual-route theory of reading aloud was first described in the early 1970s. This theory suggests that two separate mental mechanisms, or cognitive routes, are involved in reading aloud, with output of both mechanisms contributing to the pronunciation of a written stimulus.
References
- 1 2 Ramus, Franck (2001). "Dyslexia: Talk of two theories". Nature. Nature Publishing Group. 412 (6845): 393–394. doi: 10.1038/35086683 . PMID 11473297. S2CID 39927964.
- ↑ Vellutino, Frank R.; Jack M. Fletcher; Margaret J. Snowling; Donna M. Scanlon (January 2004). "Specific reading disability (dyslexia): what have we learned in the past four decades?". Journal of Child Psychology and Psychiatry. 45 (1): 2–40. doi:10.1046/j.0021-9630.2003.00305.x. PMID 14959801.
- ↑ Uppstad, Per Henning; Finn Egil Tønnessen (2007). "The notion of phonology in dyslexia research: cognitivism - and beyond". Dyslexia. John Wiley & Sons, Ltd. 13 (3): 154–74. doi:10.1002/dys.332. hdl: 11250/185924 . PMID 17624910. Archived from the original on 2012-12-16. Retrieved 2007-06-13.
General references
- Shaywitz, Sally (2005). Overcoming Dyslexia. Vintage. ISBN 0-679-78159-5.