Wikipedia:WikiProject Dyslexia/Developmental dyslexia reorganisation
|This is not a Wikipedia article: This is a workpage, a collection of material and work in progress that may or may not be incorporated into an article. It should not necessarily be considered factual or authoritative.|
Below is the content of the current dyslexia article (July 2010). The content of which does not cover all dyslexia, but only Developmental Dyslexia
|Classification and external resources|
Dyslexia is a learning disability that impairs a person's ability to read, and which can manifest itself as a difficulty with phonological awareness, phonological decoding, orthographic coding, auditory short-term memory, and/or rapid naming. Dyslexia 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 and 17 percent of the population.
There are three proposed cognitive subtypes of dyslexia: auditory, visual and attentional. Although dyslexia is not an intellectual disability, it is considered both a learning disability and a reading disability. Dyslexia and IQ are not interrelated, since reading and cognition develop independently in individuals who have dyslexia.
Spoken Language is a universal form of man made communication. The visual notation of speech, written language is not found in all cultures and is a recent development with regard to human evolution.
There are many definitions of dyslexia but no official consensus has been reached.
The World Federation of Neurology defines dyslexia as "a disorder manifested by difficulty in learning to read despite conventional instruction, adequate intelligence and sociocultural opportunity".
The National Institute of Neurological Disorders and Stroke gives the following definition for dyslexia:
"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".
Other published definitions are purely descriptive or embody causal theories. Varying definitions are used for dyslexia from researchers and organizations around the world; it appears that this disorder encompasses a number of reading skills, deficits and difficulties with a number of causes rather than a single condition.
Castles and Coltheart describe phonological and surface types of developmental dyslexia by analogy to classical subtypes of Alexia (acquired dyslexia) which are classified according to the rate of errors in reading non-words. However, the distinction between surface and phonological dyslexia has not replaced the old empirical terminology of dysphonetic versus dyseidetic types of dyslexia. The surface/phonological distinction is only descriptive, and devoid of any aetiological assumption as to the underlying brain mechanisms. In contrast, the dysphonetic/dyseidetic distinction refers to two different mechanisms; one that relates to a speech discrimination deficit, and another that relates to a visual perception impairment.
Signs and symptoms
The symptoms of dyslexia vary according to the severity of the disorder as well as the age of the individual.
It is difficult to obtain a certain diagnosis of dyslexia before a child begins school, but many dyslexic individuals have a history of difficulties that began well before kindergarten. Children who exhibit these symptoms early in life have a higher likelihood of being diagnosed as dyslexic than other children. These symptoms include:
- delays in speech
- slow learning of new words
- difficulty in rhyming words, as in nursery rhymes
- low letter knowledge
- letter reversal or mirror writing (for example, "Я" instead of "R")
Early primary school children
- Difficulty learning the alphabet or letters order
- Difficulty with associating sounds with the letters that represent them (sound-symbol correspondence)
- Difficulty identifying or generating rhyming words, or counting syllables in words (phonological awareness)
- Difficulty segmenting words into individual sounds, or blending sounds to make words  (phonemic awareness)
- Difficulty with word retrieval or naming problems
- Difficulty learning to decode written words
- Difficulty distinguishing between similar sounds in words; mixing up sounds in polysyllabic words (auditory discrimination) (for example, "aminal" for animal, "bisghetti" for spaghetti)
Older primary school children
- Slow or inaccurate reading (although these individuals can read to an extent).
- Very poor spelling
- Difficulty reading out loud, reads word in the wrong order, skips words and sometimes says a word similar to another word (auditory processing disorder)
- Difficulty associating individual words with their correct meanings
- Difficulty with time keeping and concept of time when doing a certain task
- Difficulty with organization skills (working memory)
- Children with dyslexia may fail to see (and occasionally to hear) similarities and differences in letters and words, may not recognize the spacing that organizes letters into separate words, and may be unable to sound out the pronunciation of an unfamiliar word (auditory processing disorder).
One common misconception about dyslexia is that dyslexic readers write words backwards or move letters around when reading. In fact, this only occurs in a very small population of dyslexic readers. Dyslexic people are better identified by writing that does not seem to match their level of intelligence from prior observations. Additionally, dyslexic people often substitute similar-looking, but unrelated, words in place of the ones intended (what/want, say/saw, help/held, run/fun, fell/fall, to/too, etc.).
Several learning disabilities often occur with dyslexia, but it is unclear whether these learning disabilities share underlying neurological causes with dyslexia. These disabilities include, but are not limited to:
- Cluttering— a speech fluency disorder involving both the rate and rhythm of speech, resulting in impaired speech intelligibility. Speech is erratic and nonrhythmic, consisting of rapid and jerky spurts that usually involve faulty phrasing. The personality of people with cluttering bears striking resemblance to the personalities of those with learning disabilities. 
- Dysgraphia— a disorder which expresses itself primarily through writing or typing, although in some cases it may also affect eye–hand coordination direction or sequence oriented processes such as tying knots or carrying out a repetitive task. Dysgraphia is distinct from dyspraxia in that the person may have the word to be written or the proper order of steps in mind clearly, but carries the sequence out in the wrong order.
- Dyscalculia— a neurological condition characterized by a problem with learning fundamentals and one or more of the basic numerical skills. Often people with this condition can understand very complex mathematical concepts and principles but have difficulty processing formulas or even basic addition and subtraction.
The following theories should not be viewed as competing, but viewed as theories trying to explain the underlying causes of a similar set of symptoms from a variety of research perspectives and background.
- Cerebellar theory
One view is represented by the automaticity/cerebellar theory of dyslexia. Here the biological claim is that the cerebellum of people with dyslexia is mildly dysfunctional and that a number of cognitive difficulties ensue.
- Evolutionary hypothesis
This theory posits that reading is an unnatural act carried out by humans for an exceedingly brief period in our evolutionary history. It has been less than a hundred years that western societies promoted reading to the mass population and therefore the forces that shape our reading behavior have been weak. Many areas of the world still do not even have access to reading for the majority of the population.
- Magnocellular theory
There is a unifying theory that attempts to integrate all the findings mentioned above. A generalization of the visual theory, the magnocellular theory postulates that the magnocellular dysfunction is not restricted to the visual pathways but is generalized to all modalities (visual and auditory as well as tactile).
- Naming speed deficit and double deficit theories
The speed with which an individual can engage in the rapid automatized naming of familiar objects or letters is a strong predictor of dyslexia. Slow naming speed can be identified as early as kindergarten and persists in adults with dyslexia.
A deficit in naming speed is hypothesized to represent a deficit that is separate from phonological processing deficit. Wolf identified four types of readers: readers with no deficits, readers with phonological processing deficit, readers with naming speed deficit, and readers with double deficit (that is, problems both with phonological processing and naming speed). Students with double deficits are most likely to have some sort of severe reading impairment.
Distinguishing among these deficits has important implications for instructional intervention. If students with double deficits receive instruction only in phonological processing, they are only receiving part of what they need.
- Perceptual visual-noise exclusion hypothesis
The concept of a perceptual noise exclusion (impaired filtering of behaviorally irrelevant visual information in dyslexia or visual-noise) deficit is an emerging hypothesis, supported by research showing that subjects with dyslexia experience difficulty in performing visual tasks (such as motion detection in the presence of perceptual distractions) but do not show the same impairment when the distracting factors are removed in an experimental setting.  The researchers have analogized their findings concerning visual discrimination tasks to findings in other research related to auditory discrimination tasks. They assert that dyslexic symptoms arise because of an impaired ability to filter out both visual and auditory distractions, and to categorize information so as to distinguish the important sensory data from the irrelevant. 
- Phonological deficit theory
The phonological deficit theory postulates that people with dyslexia have a specific impairment in the representation, storage and/or retrieval of speech sounds. It explains the reading impairment of dyslexic persons on the basis that learning to read an alphabetic system requires learning the grapheme/phoneme correspondence, i.e. the correspondence between letters and constituent sounds of speech.
- Rapid auditory processing theory
The rapid auditory processing theory is an alternative to the phonological deficit theory, which specifies that the primary deficit lies in the perception of short or rapidly varying sounds. Support for this theory arises from evidence that people with dyslexia show poor performance on a number of auditory tasks, including frequency discrimination and temporal order judgment.
- Visual theory
The visual theory reflects another long standing tradition in the study of dyslexia, that of considering it as a visual impairment giving rise to difficulties with the processing of letters and words on a page of text. This may take the form of unstable binocular fixations, poor vergence, or increased visual crowding. The visual theory does not exclude a phonological deficit.
Effect of language orthography
The complexity of a language's orthography or spelling system – formally, its orthographic depth – has a direct impact on how difficult it is to learn to read that language. English has a comparatively deep orthography within the Latin alphabet writing system, with a complex orthographic structure that employs spelling patterns at several levels: principally, letter-sound correspondences, syllables, and morphemes. Other languages, such as Spanish, have alphabetic orthographies that employ only letter-sound correspondences, so-called shallow orthographies. It is relatively easy to learn to read languages like Spanish; it is much more difficult to learn to read languages with more complex orthographies, such as English. Logographic writing systems, notably Japanese and Chinese characters, have a purer direct relationship between the sound of a word and the representative visual symbols, which pose a different type of dyslexic difficulty.
From a neurological perspective, different types of writing system, for example alphabetic as compared to logographic writing systems, require different neurological pathways in order to read, write and spell. Because different writing systems require different parts of the brain to process the visual notation of speech, children with reading problems in one language might not have a reading problem in a language with a different orthography. The neurological skills required to perform the tasks of reading, writing, and spelling can vary between different writing systems and as a result different neurological deficits can cause dyslexic problems in relation to different orthographies.
The following conditions may be contributory or overlapping factors, as they can lead to difficulties reading:
- Aphasia - The multiples issues which can cause Alexia (acquired dyslexia).
- Attention deficit hyperactivity disorder -  A disorder that occurs in between 12% and 24% of those with dyslexia.
- Auditory processing disorder - A condition that affects the ability to process auditory information. Auditory processing disorder is a listening disability. It can lead to problems with auditory memory and auditory sequencing. Many people with dyslexia have auditory processing problems including history of auditory reversals, and may develop their own logographic cues to compensate for this type of deficit. Auditory processing disorder is recognized as one of the major causes of dyslexia. Some children can acquire auditory processing disorder as a result of experiencing otitis media with effusion (glue ear, sticky ear, grommets) and other severe ear conditions.
- Developmental dyspraxia - A neurological condition characterized by a marked difficulty in carrying out routine tasks involving balance, fine-motor control, kinesthetic coordination, difficulty in the use of speech sounds, problems with short term memory and organization are typical of dyspraxics.
- Scotopic sensitivity syndrome, also known as Irlen Syndrome - A term used to describe sensitivity to certain wavelengths of light which interfere with visual processing.
- Specific language impairment (SLI) - A developmental language disorder that can affect both expressive and receptive language. SLI is defined as a "pure" language impairment, meaning that is not related to or caused by other developmental disorders, hearing loss or acquired brain injury. A study by the Universities of Maastricht and Utrecht examined speech perception and speech production in 3-year-old Dutch children at familial risk of developing dyslexia. Their performance in speech sound categorization and their production of words was compared to that of age-matched children with SLI and typically developing controls. The results of the at-risk and SLI-group were highly similar. Analysis of the individual data revealed that both groups contained subgroups with good and poorly performing children. Their impaired expressive phonology seemed to be related to a deficit in speech perception. The findings indicate that both dyslexia and SLI can be explained by a multi-risk model which includes cognitive processes as well as genetic factors.
Experience of speech acquisition delays and speech and language problems can be due to problems processing and decoding auditory input prior to reproducing their own version of speech, and may be observed as stuttering, cluttering or hesitant speech.
There is no cure for dyslexia, but dyslexic individuals can learn to read and write with appropriate educational support.
For alphabet writing systems the fundamental aim is to increase a child's awareness of correspondences between graphemes and phonemes, and to relate these to reading and spelling. It has been found that training focused towards visual language and orthographic issues yields longer-lasting gains than mere oral phonological training.
The best approach is determined by the underlying neurological cause(s) of the dyslexic symptoms.
Context sensitive spell checkers combined with text-to-speech systems and aimed for dyslexia assistance, such as Ghotit Dyslexia Spellchecker, is the new direction in helping to adults and kids with dyslexia to write successfully. 
- Identified by Oswald Berkhan in 1881, the term 'dyslexia' was later coined in 1887 by Rudolf Berlin, an ophthalmologist practising in Stuttgart, Germany.
- In 1896, W. Pringle Morgan published a description of a reading-specific learning disorder in the British Medical Journal titled "Congenital Word Blindness".
- During the 1890s and early 1900s, James Hinshelwood published a series of articles in medical journals describing similar cases of congenital word blindness. In his 1917 book Congenital Word Blindness, Hinshelwood asserted that the primary disability was in visual memory for words and letters, and described symptoms including letter reversals, and difficulties with spelling and reading comprehension.
- 1925 Samuel T. Orton determined that there was a syndrome unrelated to brain damage that made learning to read difficult. Orton's theory strephosymbolia described individuals with dyslexia having difficulty associating the visual forms of words with their spoken forms. Orton observed that reading deficits in dyslexia did not seem to stem from strictly visual deficits. He believed the condition was caused by the failure to establish hemispheric dominance in the brain. Orton later worked with the psychologist and educator Anna Gillingham to develop an educational intervention that pioneered the use of simultaneous multisensory instruction.
- In contrast, Dearborn, Gates, Bennet and Blau considered a faulty guidance of the seeing mechanism to be the cause. They sought to discover if a conflict between spontaneous orientation of the scanning action of the eyes from right to left and training aimed at the acquisition of an opposite direction would allow an interpretation of the facts observed in the dyslexic disorder and especially of the ability to mirror-read.
- 1949 Research conducted under G. Mahec show that the phenomenon is clearly linked to the dynamics of sight as it disappears when the space between letters is increased, transforming the reading into spelling. This experience also explains the ability to mirror-read.
- 1968 Makita suggested that dyslexia was mostly absent among Japanese children. A 2005 study shows that Makita's claim of rarity of incidence of reading disabilities in Japan to be incorrect.
- In the 1970s a new hypothesis emerged: that dyslexia stems from a deficit in phonological processing or difficulty in recognizing that spoken words are formed by discrete phonemes. Affected individuals have difficulty associating these sounds with the visual letters that make up written words. Key studies suggested the importance of phonological awareness,
- 1979 Galaburda and Kemper, and Galaburda et al. 1985, reported observations from the examination of post autopsy brains of people with dyslexia. Their studies reporting observed anatomical differences in the language center in a dyslexic brain, taken with the similar work of Cohen et al. 1989, suggested abnormal cortical development, which was presumed to occur before or during the sixth month of foetal brain development.
- 1993 Castles and Coltheart describe developmental dyslexia as two prevalent and distinct varieties using the subtypes of Alexia (acquired dyslexia), Surface and Phonological Dyslexia. Manis et al. 1996, concluded that there were probably more than two subtypes of dyslexia, which would be related to multiple underlying deficits.
- 1994 From post autopsy specimens Galaburda et al., reported : Abnormal auditory processing in people with dyslexia suggests that accompanying anatomical abnormalities might be present in the auditory system. Supported the reported behavioral findings of a left hemisphere-based phonological defect in dyslexic individuals.
- The development of neuroimaging technologies during the 1980s and 1990s enabled dyslexia research to make significant advances. Positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) studies have revealed the neural signature of adult normal reading (e.g. Fiez and Petersen, 1998; Turkeltaub et al., 2002) and phonological processing (e.g., Gelfand and Bookheimer, 2003; Poldrack et al., 1999). Employing various experimental approaches and paradigms (e.g., the detection or judgment of rhymes, nonword reading, and implicit reading), these studies have localized dysfunctional phonological processing in dyslexia to left-hemisphere perisylvian regions, especially for the alphabetic writing system (Paulesu et al., 2001; for review, see Eden and Zeffiro, 1998). However, it has been demonstrated that in nonalphabetic scripts, where reading places less demands on phonemic processing and the integration of visual-orthographic information is crucial, dyslexia is associated with under activity of the left middle frontal gyrus (Siok et al., 2004).
- 1999 Wydell and Butterworth reported the case study of an English-Japanese bilingual with monolingual dyslexia. Suggesting that any language where orthography-to-phonology mapping is transparent, or even opaque, or any language whose orthographic unit representing sound is coarse (i.e. at a whole character or word level) should not produce a high incidence of developmental phonological dyslexia, and that orthography can influence dyslexic symptoms.
- 2003 A review by Collins and Rourke concluded that the current models of the relation between the brain and dyslexia generally focus on some form of defective or delayed brain maturation. The same year Ziegler claimed that the dyslexia suffered by German or Italian dyslexics is very similar to the one suffered by English dyslexics (readers of different—shallow versus deep orthographic systems), supporting the idea that the origin of dyslexia is mostly biological.
- 2007 Lyytinen et al. Researchers are seeking a link between the neurological and genetic findings, and the reading disorder.
- 2008 S Heim et al. in a paper titled "Cognitive subtypes of dyslexia" describe how they compared different sub-groups of dyslexics in comparison with a control group. This is one of the first studies not to just compare dyslexics with a non dyslexic control, but to go further and compared the different cognitive sub groups with a non dyslexic control group.
- 2008 Wai Ting Siok et al. in a paper titled "A structural–functional basis for dyslexia in the cortex of Chinese readers" describe how dyslexia is language dependent, and especially between alphabetic and non-alphabetic writing systems.
- 2010 KK Chung et al. investigated the "Cognitive profiles of Hong Kong Chinese adolescents with dyslexia".
- 2010 T. Hadzibeganovic et al. in a "Cross-Linguistic Neuroimaging and Dyslexia" review noted that recent neuroimaging studies have indicate that there is no single cognitive cause of dyslexia due to the different cognitive skills sets required for different orthographies, and even in the same language there are different sub types of dyslexia.
Society and culture
There are many different national legal statutes and different national special education support structures with regard to special education provision which relate to the management of dyslexia.
Film, television, and literature
There have been a number of films, television programs, and works of fiction which focus on the topic of dyslexia.
The majority of currently available dyslexia research relates to the alphabetic writing system, and especially to languages of European origin. However, substantial research is also available regarding dyslexia for speakers of Arabic, Chinese, and Hebrew.
Modern neuroimaging techniques such as functional Magnetic Resonance Imaging (fMRI) and Positron Emission Tomography (PET) have produced clear evidence of structural differences in the brains of children with reading difficulties. It has been found that people with dyslexia have a deficit in parts of the left hemisphere of the brain involved in reading, which includes the inferior frontal gyrus, inferior parietal lobule, and middle and ventral temporal cortex.
That dyslexia is neurobiological in origin is supported by what Lyon et al. proclaimed as "overwhelming and converging data from functional brain imaging investigations" (2003, p. 3). The results of these studies suggest that there are observable differences in how the dyslexic brain functions when compared to the brain of a typical reader. Using fMRI, Shaywitz found that good readers show a consistent pattern of strong activation in the back of the brain with weaker activation in the front of the brain during reading tasks. In contrast, the brain activation pattern in dyslexics is the opposite during reading tasks—the frontal part of the brain becomes overactive with weaker activation in the back. Shaywitz points out "It is as if these struggling readers are using the systems in the front of the brain to try to compensate for the disruption in the back of the brain."
Brain activation studies using PET to study language have produced a breakthrough in our understanding of the neural basis of language over the past decade. A neural basis for the visual lexicon and for auditory verbal short term memory components have been proposed. with some implication that the observed neural manifestation of developmental dyslexia is task-specific (i.e., functional rather than structural)
A University of Hong Kong study argues that dyslexia affects different structural parts of children's brains depending on the language which the children read. The study focused on comparing children that were raised reading English and children raised reading Chinese. This is supported in a review by T. Hadzibeganovic et al. (2010).
Molecular studies have linked several forms of dyslexia to genetic markers for dyslexia. Several candidate genes have been identified, including at the two regions first related to dyslexia: DCDC2 and KIAA0319 on chromosome 6, and DYX1C1 on chromosome 15.
A 2007 review reported that no specific cognitive processes are known to be influenced by the proposed susceptibility genes.
A unifying theoretical framework of three working memory components provides a systems perspective for discussing past and new findings in a 12-year research program that point to heterogeneity in the genetic and brain basis and behavioral expression of dyslexia.
In recent years there has been significant debate on the categorization of dyslexia. In particular, Elliot and Gibbs argue that "attempts to distinguish between categories of 'dyslexia' and 'poor reader' or 'reading disabled' are scientifically unsupportable, arbitrary and thus potentially discriminatory". 
While acknowledging that reading disability is a valid scientific curiosity, and that "seeking greater understanding of the relationship between visual symbols and spoken language is crucial" and that while there was "potential of genetics and neuroscience for guiding assessment and educational practice at some stage in the future", they conclude that "there is a mistaken belief that current knowledge in these fields is sufficient to justify a category of dyslexia as a subset of those who encounter reading difficulties".
- "Dyslexia Information Page". National Institute of Neurological Disorders and Stroke. 2010-05-12. Retrieved 2010-07-05.
- Grigorenko EL (January 2001). "Developmental dyslexia: an update on genes, brains, and environments". J Child Psychol Psychiatry 42 (1): 91–125. doi:10.1111/1469-7610.00704. PMID 11205626.
- Schulte-Körne G, Warnke A, Remschmidt H (November 2006). "[Genetics of dyslexia]". Z Kinder Jugendpsychiatr Psychother (in German) 34 (6): 435–44. doi:10.1024/1422-4918.104.22.1685. PMID 17094062.
- Stanovich KE (December 1988). "Explaining the differences between the dyslexic and the garden-variety poor reader: the phonological-core variable-difference model". Journal of Learning Disabilities 21 (10): 590–604. doi:10.1177/002221948802101003. PMID 2465364.
- Warnke, Andreas (1999-09-19). "Reading and spelling disorders: Clinical features and causes". Journal European Child & Adolescent Psychiatry 8 (3): S2–S12. doi:10.1007/PL00010689. Retrieved 2010-07-11.
- McCandliss BD, Noble KG (2003). "The development of reading impairment: a cognitive neuroscience model". Ment Retard Dev Disabil Res Rev 9 (3): 196–204. doi:10.1002/mrdd.10080. PMID 12953299.
- Czepita D, Lodygowska E (2006). "[Role of the organ of vision in the course of developmental dyslexia]". Klin Oczna (in Polish) 108 (1–3): 110–3. PMID 16883955.
- Birsh, Judith R. (2005). "Research and reading disability". In Judith R. Birsh. Multisensory Teaching of Basic Language Skills. Baltimore, Maryland: Paul H. Brookes Publishing. p. 8. ISBN 978-1-55766-678-5 Check
|isbn=value (help). OCLC 234335596.
- Valdois S, Bosse ML, Tainturier MJ (November 2004). "The cognitive deficits responsible for developmental dyslexia: review of evidence for a selective visual attentional disorder". Dyslexia 10 (4): 339–63. doi:10.1002/dys.284. PMID 15573964.
- Heim S, Tschierse J, Amunts K (2008). "Cognitive subtypes of dyslexia". Acta Neurobiologiae Experimentalis 68 (1): 73–82. ISSN 0065-1400. PMID 18389017.
- Facoetti A, Lorusso ML, Paganoni P, et al. (April 2003). "Auditory and visual automatic attention deficits in developmental dyslexia". Brain Res Cogn Brain Res 16 (2): 185–91. doi:10.1016/S0926-6410(02)00270-7. PMID 12668226.
- Ahissar M (November 2007). "Dyslexia and the anchoring-deficit hypothesis". Trends Cogn. Sci. (Regul. Ed.) 11 (11): 458–65. doi:10.1016/j.tics.2007.08.015. PMID 17983834.
- Chung KK, Ho CS, Chan DW, Tsang SM, Lee SH (February 2010). "Cognitive profiles of Chinese adolescents with dyslexia". Dyslexia 16 (1): 2–23. doi:10.1002/dys.392. PMID 19544588.
- "Learning Disorders: MeSH Result". NLM MeSH Browser. Retrieved 2009-11-06.
- "Dyslexia". The National Center for Learning Disabilities, Inc. Retrieved 2009-11-07.
- "Dyslexia". Mayo Foundation for Medical Education and Research. Retrieved 2009-11-07.
- Ferrer E, Shaywitz BA, Holahan JM, Marchione K, Shaywitz SE (January 2010). "Uncoupling of reading and IQ over time: empirical evidence for a definition of dyslexia". Psychol Sci 21 (1): 93–101. doi:10.1177/0956797609354084. PMID 20424029.
- Bishop DV (March 2009). "Genes, cognition, and communication: insights from neurodevelopmental disorders". Ann. N. Y. Acad. Sci. 1156: 1–18. doi:10.1111/j.1749-6632.2009.04419.x. PMC 2805335. PMID 19338500.
- "What Is Dyslexia?". AVKO Education Research Foundation. Retrieved 2010-07-05.
- "Developmental reading disorder". MedlinePlus Medical Encyclopedia. 2008-10-15. Retrieved 2010-07-05.
- "Developmental dyslexia in adults: a research review". National Research and Development Centre for Adult Literacy and Numeracy. 2004-05-01. pp. *133–147. Retrieved 2009-05-13.
- Brazeau-Ward, Louise (2001). Dyslexia and the University. Canada: Canadian Dyslexia Centre. pp. 1–3. ISBN 1-894964-71-3.
- Castles A, Coltheart M (May 1993). "Varieties of developmental dyslexia". Cognition 47 (2): 149–80. doi:10.1016/0010-0277(93)90003-E. PMID 8324999.
- Habib M (December 2000). "The neurological basis of developmental dyslexia: an overview and working hypothesis". Brain 123 (12): 2373–99. doi:10.1093/brain/123.12.2373. PMID 11099442.
- Boder E (October 1973). "Developmental dyslexia: a diagnostic approach based on three atypical reading-spelling patterns". Developmental Medicine and Child Neurology 15 (5): 663–87. doi:10.1111/j.1469-8749.1973.tb05180.x. PMID 4765237.
- Galaburda AM, Cestnick L (February 2003). "[Developmental dyslexia]". Rev Neurol (in Spanish; Castilian). 36 Suppl 1: S3–9. PMID 12599096.
- Schott GD, Schott JM (December 2004). "Mirror writing, left-handedness, and leftward scripts". Arch. Neurol. 61 (12): 1849–51. doi:10.1001/archneur.61.12.1849. PMID 15596604.
- Schott GD (January 2007). "Mirror writing: neurological reflections on an unusual phenomenon". J. Neurol. Neurosurg. Psychiatr. 78 (1): 5–13. doi:10.1136/jnnp.2006.094870. PMC 2117809. PMID 16963501.
- Lovio R, Näätänen R, Kujala T (June 2010). "Abnormal pattern of cortical speech feature discrimination in 6-year-old children at risk for dyslexia". Brain Res. 1335: 53–62. doi:10.1016/j.brainres.2010.03.097. PMID 20381471.
- Nicolson RI, Fawcett AJ (September 2009). "Dyslexia, dysgraphia, procedural learning and the cerebellum". Cortex. doi:10.1016/j.cortex.2009.08.016. PMID 19818437.
- Tiger, Ruth J.; Irvine, Terry L.; Reis, Ronald P. (1 January 1980). "Cluttering as a Complex of Learning Disabilities". Language, Speech, and Hearing Services in Schools 11 (1): 3–14.
- Ramus F, Rosen S, Dakin SC (April 2003). "Theories of developmental dyslexia: insights from a multiple case study of dyslexic adults". Brain 126 (4): 841–65. doi:10.1093/brain/awg076. PMID 12615643.
- Nicolson RI, Fawcett AJ (April 2007). "Procedural learning difficulties: reuniting the developmental disorders?". Trends Neurosci. 30 (4): 135–41. doi:10.1016/j.tins.2007.02.003. PMID 17328970.
- Stoodley CJ, Stein JF (October 2009). "The cerebellum and dyslexia". Cortex. doi:10.1016/j.cortex.2009.10.005. PMID 20060110.
- Dalby JT (September 1986). "An ultimate view of reading ability". The International Journal of Neuroscience 30 (3): 227–30. doi:10.3109/00207458608985671. PMID 3759349.
- Ray NJ, Fowler S, Stein JF (April 2005). "Yellow filters can improve magnocellular function: motion sensitivity, convergence, accommodation, and reading". Ann. N. Y. Acad. Sci. 1039: 283–93. doi:10.1196/annals.1325.027. PMID 15826982.
- Denckla MB, Rudel RG (1976). "Rapid "automatized" naming (R.A.N): dyslexia differentiated from other learning disabilities". Neuropsychologia 14 (4): 471–9. doi:10.1016/0028-3932(76)90075-0. PMID 995240.
- Birsh, Judith R. (2005). "Alphabet knowledge: letter recognition, naming and sequencing". In Judith R. Birsh. Multisensory Teaching of Basic Language Skills. Baltimore, Maryland: Paul H. Brookes Publishing. p. 119. ISBN 978-1-55766-678-5 Check
|isbn=value (help). OCLC 234335596.
- Sperling AJ, Lu ZL, Manis FR, Seidenberg MS (December 2006). "Motion-perception deficits and reading impairment: it's the noise, not the motion". Psychological Science 17 (12): 1047–53. doi:10.1111/j.1467-9280.2006.01825.x. PMID 17201786.
- Roach NW, Hogben JH (March 2007). "Impaired filtering of behaviourally irrelevant visual information in dyslexia". Brain 130 (3): 771–85. doi:10.1093/brain/awl353. PMID 17237361.
- Sperling AJ, Lu ZL, Manis FR, Seidenberg MS (July 2005). "Deficits in perceptual noise exclusion in developmental dyslexia". Nature Neuroscience 8 (7): 862–3. doi:10.1038/nn1474. PMID 15924138.
- Henry, Marcia K. (2005). "The history and structure of the English language". In Judith R. Birsh. Multisensory Teaching of Basic Language Skills. Baltimore, Maryland: Paul H. Brookes Publishing. p. 154. ISBN 978-1-55766-678-5 Check
|isbn=value (help). |oclc=234335596
- Seki A, Kassai K, Uchiyama H, Koeda T (March 2008). "Reading ability and phonological awareness in Japanese children with dyslexia". Brain Dev. 30 (3): 179–88. doi:10.1016/j.braindev.2007.07.006. PMID 17720344.
- Siok WT, Niu Z, Jin Z, Perfetti CA, Tan LH (April 2008). "A structural-functional basis for dyslexia in the cortex of Chinese readers" (Free full text). Proc. Natl. Acad. Sci. U.S.A. 105 (14): 5561–6. doi:10.1073/pnas.0801750105. PMC 2291101. PMID 18391194.
- Wydell TN, Butterworth B (April 1999). "A case study of an English-Japanese bilingual with monolingual dyslexia". Cognition 70 (3): 273–305. doi:10.1016/S0010-0277(99)00016-5. PMID 10384738.
- Ramus F, Pidgeon E, Frith U (July 2003). "The relationship between motor control and phonology in dyslexic children". Journal of Child Psychology and Psychiatry, and Allied Disciplines 44 (5): 712–22. doi:10.1111/1469-7610.00157. PMID 12831115.
- Rochelle KS, Witton C, Talcott JB (February 2009). "Symptoms of hyperactivity and inattention can mediate deficits of postural stability in developmental dyslexia". Experimental Brain Research 192 (4): 627–33. doi:10.1007/s00221-008-1568-5. PMID 18830588.
- Katz, Jack (2007-05-14). "APD Evaluation to Therapy: The Buffalo Model". AudiologyOnline. Retrieved 2009-05-16.
- Ramus F (April 2003). "Developmental dyslexia: specific phonological deficit or general sensorimotor dysfunction?". Current Opinion in Neurobiology 13 (2): 212–8. doi:10.1016/S0959-4388(03)00035-7. PMID 12744976.
- Moncrieff, Deborah (2004-02-02). "Temporal Processing Deficits in Children with Dyslexia". speechpathology.com (speechpathology.com). Retrieved 2009-05-13.
- Moncrieff, Deborah (2002-09-23). "Auditory Processing Disorders and Dyslexic Children". audiologyonline.com (audiologyonline.com). Retrieved 2009-05-13.
- Moore DR (2007). "Auditory processing disorders: acquisition and treatment". J Commun Disord 40 (4): 295–304. doi:10.1016/j.jcomdis.2007.03.005. PMID 17467002.
- Kruk R, Sumbler K, Willows D (January 2008). "Visual processing characteristics of children with Meares-Irlen syndrome". Ophthalmic & Physiological Optics 28 (1): 35–46. doi:10.1111/j.1475-1313.2007.00532.x. PMID 18201334.
- Evans BJ, Busby A, Jeanes R, Wilkins AJ (September 1995). "Optometric correlates of Meares-Irlen syndrome: a matched group study". Ophthalmic & Physiological Optics 15 (5): 481–7. doi:10.1016/0275-5408(95)00063-J. PMID 8524579.
- Pennington BF, Lefly DL (May 2001). "Early reading development in children at family risk for dyslexia". Child Development 72 (3): 816–33. doi:10.1111/1467-8624.00317. PMID 11405584.
- Schuele CM (2004). "The impact of developmental speech and language impairments on the acquisition of literacy skills". Ment Retard Dev Disabil Res Rev 10 (3): 176–83. doi:10.1002/mrdd.20014. PMID 15611989.
- Peterson RL, McGrath LM, Smith SD, Pennington BF (June 2007). "Neuropsychology and genetics of speech, language, and literacy disorders". Pediatr. Clin. North Am. 54 (3): 543–61, vii. doi:10.1016/j.pcl.2007.02.009. PMID 17543909.
- Lyytinen, Heikki, Erskine, Jane, Aro, Mikko, Richardson, Ulla (2007). "Reading and reading disorders". In Hoff, Erika. Blackwell Handbook of Language Development. Blackwell. pp. 454–474. ISBN 978-1-4051-3253-4.
- Berkhan O (1917). Neur. Zent 28.
- Wagner, Rudolph (January, 1973). "Rudolf Berlin: Originator of the term dyslexia". Annals of Dyslexia 23 (1): 57–63. doi:10.1007/BF02653841.
- "Uber Dyslexie". Archiv fur Psychiatrie 15: 276–278.
- Snowling MJ (November 1996). "Dyslexia: a hundred years on". BMJ 313 (7065): 1096–7. PMC 2352421. PMID 8916687.
- Hinshelwood, James (1917). Congenital Word-blindness. London: H.K. Lewis. OCLC 9713889.[page needed]
- Orton, Samuel (1925). "Word-blindness in school children.". Archives of Neurology and Psychiatry 14 (5): 285–516. doi:10.1001/archneurpsyc.1925.02200170002001 (inactive 2009-08-07).
- Henry, Marcia K. (December 1998). "Structured, sequential, multisensory teaching: The Orton legacy". Annals of Dyslexia 48 (1): 1–26. doi:10.1007/s11881-998-0002-9.
- Orton, Samuel T. (1928-04-07). "Specific Reading Disability — Strephosymbolia". Journal of the American Medical Association 90 (14): 1095–9.
reprinted: Orton, Samuel T. (December 1963). "Specific reading disability — Strephosymbolia". Annals of Dyslexia 13 (1): 9–17. doi:10.1007/BF02653604.
- Goeke, Jennifer; Goeke, J. L. (2006). "Orton-Gillingham and Orton-Gillingham-based reading instruction: a review of the literature". Journal of Special Education 40 (3): 171–183. doi:10.1177/00224669060400030501.
- Makita K. (1968). "The rarity of reading disability in Japanese children." American Journal of Orthopsychiatry 38:599–614.
- "Reading disabilities in modern Japanese children. Takehiko Hirose. 2005; Journal of Research in Reading – Wiley InterScience".
- Bradley, L; Bryant, P. E. (1983). "Categorizing sounds and learning to read—a causal connection". Nature 30 (2): 419–421. doi:10.1038/301419a0.
- Galaburda AM, Kemper TL (August 1979). "Cytoarchitectonic abnormalities in developmental dyslexia: a case study" (Free full text). Annals of Neurology 6 (2): 94–100. doi:10.1002/ana.410060203. PMID 496415.
- Galaburda AM, Sherman GF, Rosen GD, Aboitiz F, Geschwind N (August 1985). "Developmental dyslexia: four consecutive patients with cortical anomalies". Annals of Neurology 18 (2): 222–33. doi:10.1002/ana.410180210. PMID 4037763.
- Cohen M, Campbell R, Yaghmai F (June 1989). "Neuropathological abnormalities in developmental dysphasia" (Free full text). Annals of Neurology 25 (6): 567–70. doi:10.1002/ana.410250607. PMID 2472772.
- Manis FR, Seidenberg MS, Doi LM, McBride-Chang C, Petersen A (February 1996). "On the bases of two subtypes of developmental [corrected] dyslexia". Cognition 58 (2): 157–95. doi:10.1016/0010-0277(95)00679-6. PMID 8820386.
- Galaburda AM, Menard MT, Rosen GD (August 1994). "Evidence for aberrant auditory anatomy in developmental dyslexia". Proc. Natl. Acad. Sci. U.S.A. 91 (17): 8010–3. doi:10.1073/pnas.91.17.8010. PMC 44534. PMID 8058748.
- Fiez JA, Petersen SE (February 1998). "Neuroimaging studies of word reading". Proc. Natl. Acad. Sci. U.S.A. 95 (3): 914–21. doi:10.1073/pnas.95.3.914. PMC 33816. PMID 9448259.
- Turkeltaub PE, Eden GF, Jones KM, Zeffiro TA (July 2002). "Meta-analysis of the functional neuroanatomy of single-word reading: method and validation". NeuroImage 16 (3 Pt 1): 765–80. doi:10.1006/nimg.2002.1131. PMID 12169260.
- Gelfand JR, Bookheimer SY (June 2003). "Dissociating neural mechanisms of temporal sequencing and processing phonemes". Neuron 38 (5): 831–42. doi:10.1016/S0896-6273(03)00285-X. PMID 12797966.
- Poldrack RA, Wagner AD, Prull MW, Desmond JE, Glover GH, Gabrieli JD (July 1999). "Functional specialization for semantic and phonological processing in the left inferior prefrontal cortex". NeuroImage 10 (1): 15–35. doi:10.1006/nimg.1999.0441. PMID 10385578.
- Eden GF, Zeffiro TA (August 1998). "Neural systems affected in developmental dyslexia revealed by functional neuroimaging". Neuron 21 (2): 279–82. doi:10.1016/S0896-6273(00)80537-1. PMID 9728909.
- Eden GF, Jones KM, Cappell K (October 2004). "Neural changes following remediation in adult developmental dyslexia". Neuron 44 (3): 411–22. doi:10.1016/j.neuron.2004.10.019. PMID 15504323.
- Collins DW, Rourke BP (October 2003). "Learning-disabled brains: a review of the literature". Journal of Clinical and Experimental Neuropsychology 25 (7): 1011–34. doi:10.1076/jcen.25.7.1011.16487. PMID 13680447.
- Ziegler JC, Perry C, Ma-Wyatt A, Ladner D, Schulte-Körne G (November 2003). "Developmental dyslexia in different languages: language-specific or universal?". J Exp Child Psychol 86 (3): 169–93. doi:10.1016/S0022-0965(03)00139-5. PMID 14559203.
- Hadzibeganovic, Tarik; Maurits van den Noort, Peggy Bosche, Matjaz Perc, Rosalinde van Kralingen, Katrien Mondt and Max Coltheart (2010). "Cross-Linguistic Neuroimaging and Dyslexia: A Critical View". Cortex. doi:10.1016/j.cortex.2010.06.011. Retrieved 2010-07-17.
- "Dyslexia assessment in Arabic. Gad Elbeheri. 2006; Journal of Research in Special Educational Needs – Wiley InterScience".
- Smythe I, Everatt J, Al-Menaye N, et al. (August 2008). "Predictors of word-level literacy amongst Grade 3 children in five diverse languages". Dyslexia 14 (3): 170–87. doi:10.1002/dys.369. PMID 18697190.
- Friedmann N, Rahamim E (September 2007). "Developmental letter position dyslexia". J Neuropsychol 1 (Pt 2): 201–36. doi:10.1348/174866407X204227. PMID 19331018.
- Schiff R, Raveh M (May 2007). "Deficient morphological processing in adults with developmental dyslexia: another barrier to efficient word recognition?". Dyslexia 13 (2): 110–29. doi:10.1002/dys.322. PMID 17557687.
- Cao F, Bitan T, Chou TL, Burman DD, Booth JR (October 2006). "Deficient orthographic and phonological representations in children with dyslexia revealed by brain activation patterns". Journal of Child Psychology and Psychiatry, and Allied Disciplines 47 (10): 1041–50. doi:10.1111/j.1469-7610.2006.01684.x. PMC 2617739. PMID 17073983.
- Shaywitz, Sally (2003). Overcoming dyslexia: a new and complete science-based program for reading problems at any level. Vintage Books. p. 81. ISBN 0-679-78159-5.
- Chertkow H, Murtha S (1997). "PET activation and language" (Free full text). Clinical Neuroscience 4 (2): 78–86. PMID 9059757.
- McCrory E, Frith U, Brunswick N, Price C (September 2000). "Abnormal functional activation during a simple word repetition task: A PET study of adult dyslexics". Journal of Cognitive Neuroscience 12 (5): 753–62. doi:10.1162/089892900562570. PMID 11054918.
- Blau V, van Atteveldt N, Ekkebus M, Goebel R, Blomert L (March 2009). "Reduced neural integration of letters and speech sounds links phonological and reading deficits in adult dyslexia". Current Biology 19 (6): 503–8. doi:10.1016/j.cub.2009.01.065. PMID 19285401.
- Grigorenko EL, Wood FB, Meyer MS (January 1997). "Susceptibility loci for distinct components of developmental dyslexia on chromosomes 6 and 15". American Journal of Human Genetics 60 (1): 27–39. PMC 1712535. PMID 8981944.
- Meng H, Smith SD, Hager K (November 2005). "DCDC2 is associated with reading disability and modulates neuronal development in the brain". Proc. Natl. Acad. Sci. U.S.A. 102 (47): 17053–8. doi:10.1073/pnas.0508591102. PMC 1278934. PMID 16278297.
- Paracchini S, Steer CD, Buckingham LL (December 2008). "Association of the KIAA0319 dyslexia susceptibility gene with reading skills in the general population". The American Journal of Psychiatry 165 (12): 1576–84. doi:10.1176/appi.ajp.2008.07121872. PMID 18829873.
- Grigorenko EL, Wood FB, Meyer MS, Pauls DL (February 2000). "Chromosome 6p influences on different dyslexia-related cognitive processes: further confirmation". American Journal of Human Genetics 66 (2): 715–23. doi:10.1086/302755. PMC 1288124. PMID 10677331.
- Schumacher J, Hoffmann P, Schmäl C, Schulte-Körne G, Nöthen MM (May 2007). "Genetics of dyslexia: the evolving landscape". Journal of Medical Genetics 44 (5): 289–97. doi:10.1136/jmg.2006.046516. PMC 2597981. PMID 17307837.
- Berninger VW, Raskind W, Richards T, Abbott R, Stock P (2008). "A multidisciplinary approach to understanding developmental dyslexia within working-memory architecture: genotypes, phenotypes, brain, and instruction". Developmental Neuropsychology 33 (6): 707–44. doi:10.1080/87565640802418662. PMID 19005912.
- Elliott, Julian G.; Gibbs, Simon (2008). "Does Dyslexia Exist?". Journal of Philosophy of Education, 42 (3–4): 475–491. doi:10.1111/j.1467-9752.2008.00653.x.
- Research papers, articles and media
- Auditory and Visual Dynamic Processing: Separate Influences in Reading? by Caroline Witton, Joel B. Talcott, Peter C. Hansen, Catherine J. Stoodley & John F. Stein
- Evaluating Alternative Solutions for Dyslexia by Professor Dorothy Bishop
- International Dyslexia Association
- British Dyslexics Charity
- British Dyslexia Association
- European Dyslexia Association
- Dyslexia Research Trust