|Classification and external resources|
Dyslexia, also known as reading disorder or alexia, is a learning disability characterized by trouble reading despite a normal intelligence. Different people are affected to different degrees. Problems may include sounding out words, spelling words, reading quickly, writing words, pronouncing words when reading aloud, and understanding what was read. Often these difficulties are first noticed at school. The difficulties are not voluntary and people with this disorder have a normal desire to learn.
The cause of dyslexia is believed to involve both genetic and environmental factors. Some cases run in families. It occurs more often in people with attention deficit hyperactivity disorder (ADHD) and is associated with problems with mathematics. When the condition begins in adults it may be the result of a traumatic brain injury, stroke, or dementia. The underlying mechanism involves problems with the brain's processing of language. Diagnosis is by a series of tests of a person's memory, spelling, ability to see, and reading skills. It is separate from reading difficulties due to poor teaching, or hearing or vision problems.
Treatment usually involves adjusting teaching methods to meet the person's needs. While this does not cure the underlying problem, difficulties can be ameliorated. Treatments aimed at vision are not effective. Dyslexia is the most common learning disability, affecting about 3 to 7 percent of people. While it is diagnosed more often in males, some believe it actually affects males and females equally. Up to 20 percent of the population may have some degree of symptoms. Dyslexia occurs in all areas of the world.
- 1 Classification
- 2 Signs and symptoms
- 3 Causes
- 4 Mechanisms
- 5 Diagnosis
- 6 Management
- 7 Prognosis
- 8 Epidemiology
- 9 History
- 10 Research and society
- 11 See also
- 12 References
- 13 Further reading
- 14 External links
Dyslexia is thought to have two kinds of causes, one related to language processing, and the other, to visual processing. It is considered a cognitive disorder, not a problem with intelligence; there are often emotional problems that arise because of it. There are many published definitions which are purely descriptive or involve proposed causes that encompass a variety of reading skills, deficits, and difficulties with distinct causes rather than a single condition. The National Institute of Neurological Disorders and Stroke definition describes dyslexia as "difficulty with spelling, phonological processing (the manipulation of sounds), or rapid visual-verbal responding." The British Dyslexia Association definition describes dyslexia as "a learning difficulty that primarily affects the skills involved in accurate and fluent word reading and spelling." Characterized by "difficulties in phonological awareness, verbal memory and verbal processing speed."
Acquired dyslexia or alexia may be caused by brain damage due to a stroke or atrophy. Forms of alexia include pure alexia, surface dyslexia, semantic dyslexia, phonological dyslexia, and deep dyslexia.
Signs and symptoms
In early childhood, symptoms that correlate with a later diagnosis of dyslexia include delayed onset of speech, difficulty distinguishing left from right, difficulty with direction, as well as being easily distracted by background noise. While they do occur in people with dyslexia, reversal of letters or words, or mirror writing, is not included in the definition of dyslexia, and its relationship with dyslexia is controversial.
School-age dyslexic children may exhibit signs of difficulty identifying or generating rhyming words, or when counting syllables in words – both of which depend on phonological awareness. They may also show difficulty when segmenting words into individual sounds or may blend sounds when producing words – indicating reduced phonemic awareness. Difficulties with word retrieval or when naming things also feature in dyslexia.:647 Dyslexics are commonly poor spellers, a feature sometimes called dysorthographia or dysgraphia, which depends on orthographic coding.
Problems persist into adolescence and adulthood and may accompany difficulties with summarizing stories, memorization, reading aloud, or learning foreign languages. Adult dyslexics can often read with good comprehension, although they tend to read more slowly than non-dyslexics and perform worse in tests of spelling or when reading nonsense words – a measure of phonological awareness.
A common myth about dyslexia is that its defining feature is reading or writing letters or words backwards; however, this is true of many children as they learn to read and write.
The orthographic complexity of a language directly impacts how difficult learning to read the language is.:266 English and French have comparatively deep orthographies within the Latin alphabet writing system with complex structures employing spelling patterns of several levels: letter-sound correspondence, syllables, and morphemes.:421 Other languages, such as Spanish, Italian and Finnish have mostly alphabetic orthographies which employ primarily letter-sound correspondence, so-called shallow orthographies, making them easier to learn for people with dyslexia.:266 Logographic writing systems such as Chinese characters have graphemes that are in part unlinked to pronunciation, pose problems to dyslexic learners.
Several learning disabilities often occur together with dyslexia, but it is unclear whether they share underlying neurological causes. These disabilities may include:
- 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. In dyslexia, dysgraphia is often multifactorial, due to impaired letter writing automaticity, finger motor sequencing challenges, organizational and elaborative difficulties, and impaired visual word form which makes it more difficult to retrieve the visual picture of words required for spelling.
- Attention deficit disorder – A significant degree of comorbidity has been reported between ADHD and dyslexia or reading disorders, it occurs in 12 to 24 percent of all individuals 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 and may develop their own logographic cues to compensate for this type of deficit. Some research could indicate auditory processing skills could be the primary shortfall in Dyslexia.
- Developmental coordination disorder – 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.
Researchers have been trying to find the neurobiological basis of dyslexia since it was first identified in 1881. An example of one of the problems dyslexics experience would be seeing letters clearly, which may be due to abnormal development of their visual nerve cells. A recent study has identified a possible genetic origin to the disorder.
In the area of neurological research into dyslexia, modern neuroimaging techniques such as functional magnetic resonance imaging (fMRI) and positron emission tomography (PET) have shown a correlation between functional and structural differences in the brains of children with reading difficulties. Some individuals with dyslexia show less electrical activation 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. Brain activation studies using PET to study language have produced a breakthrough in 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). fMRIs in dyslexics have provided important data supporting the interactive role of the cerebellum and cerebral cortex as well as other brain structures.
The cerebellar theory of dyslexia proposes that impairment of cerebellum-controlled muscle movement affecting the formation of words by the tongue and facial muscles may result in the fluency problems that are characteristic of some dyslexics. The cerebellum is also involved in the automatization of some tasks, such as reading. Some dyslexic children are impaired in motor tasks and balance, and this has been used as evidence for a cerebellar role in their reading difficulties. The cerebellar theory lacks the support of controlled research studies.
Genetic research into dyslexia and its inheritance has its roots in the examination of post-autopsy brains of people with dyslexia. When they observed anatomical differences in the language center in a dyslexic brain, they showed microscopic cortical malformations known as ectopias and more rarely vascular micro-malformations, and in some instances these cortical malformations appeared as a microgyrus. These studies and others suggested abnormal cortical development which was presumed to occur before or during the sixth month of fetal brain development. Abnormal cell formations in dyslexics found on autopsy have also been reported in non-language cerebral and subcortical brain structures. Several genes have been associated with dyslexia, including DCDC2 and KIAA0319 on chromosome 6, and DYX1C1 on chromosome 15.
Research has examined gene–environment interactions in reading disability through twin studies, which estimate the proportion of variance associated with environment and the proportion associated with heritability. Studies examining the influence of environmental factors such as parental education and teacher quality have determined that genetics has greater influence in supportive, rather than less optimal, environments. Instead, it may just allow those genetic risk factors to account for more of the variance in outcome, because environmental risk factors that affect that outcome have been minimized. As the environment plays a large role in learning and memory, it is likely that epigenetic modifications play an important role in reading ability. Animal experiments and measures of gene expression and methylation in the human periphery are used to study epigenetic processes, both of which have many limitations in extrapolating results for application to the human brain.
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. One mechanism is the lexical route, which is the process whereby skilled readers can recognize known words by sight alone, through a “dictionary” lookup procedure. The other mechanism is the nonlexical or sublexical route, which is the process whereby the reader can “sound out” a written word. This is done by identifying the word's constituent parts (letters, phonemes, graphemes) and applying knowledge of how these parts are associated with each other, for example how a string of neighboring letters sound together. The dual-route system can provide an explanation for the differences in dyslexia rates between different languages (e.g. the Spanish language dependence on phonological rules account for the fact that Spanish-speaking children show a higher level of performance in non-word reading,when compared to English-speakers).
There are tests that can indicate with high probability if the person is dyslexic. This is often follow up with of a full diagnostic assessment to determine the extent and nature of the disorder, tests can be administered by a teacher or computer.
Central dyslexias include surface dyslexia, semantic dyslexia, phonological dyslexia, and deep dyslexia. ICD-10 reclassified the previous distinction between dyslexia (315.02 in ICD-9) and alexia (315.01 in ICD-9) into a single classification as R48.0. The terms are applied for developmental dyslexia and inherited dyslexia along with developmental aphasia and inherited alexia, which are now read as cognates in meaning and synonymous.
In surface dyslexia, words whose pronunciations are 'regular' (highly consistent with their spelling e.g., mint) are read more accurately than words with irregular pronunciation, such as colonel. Difficulty distinguishing homophones is diagnostic of some forms of surface dyslexia. This disorder is usually accompanied by (surface) agraphia and fluent aphasia. Acquired surface dyslexia arises after brain damage in a previously literate person and results in pronunciation errors that indicate impairment of the lexical route.
In phonological dyslexia, patients can read familiar words but have difficulty reading unfamiliar words (such as invented pseudo-words). It is thought that they can recognize words by accessing lexical memory orthographically but cannot 'sound out' novel words. Phonological dyslexia is associated with lesions in varied locations within the territory of the middle cerebral artery. The superior temporal lobe is often also involved. Furthermore, dyslexics compensate by overusing a front-brain section, called Broca's area, associated with aspects of language and speech. Research has pointed towards the theory that phonological dyslexia is a development of deep dyslexia. A treatment for phonological dyslexia is the Lindamood Phoneme Sequencing Program (LiPS). This program is based on a three-way sensory feedback process. The subject uses their auditory, visual, and oral skills to learn to recognize words and word patterns. This is considered letter-by-letter reading using a bottom-up processing technique. Case studies with a total of three patients found a significant improvement in spelling and reading ability after using LiPS.
Patients with deep dyslexia experience semantic paralexia (para-dyslexia) and phonological dyslexia, which happens when the patient reads a word, and says a related meaning instead of the denoted meaning. Deep alexia is associated with clear phonological processing impairments. Deep dyslexia is caused by lesions that are often widespread and include much of the left frontal lobe; specifically, research suggests that damage to the left perisylvian region of the frontal lobe causes deep dyslexia.
Peripheral dyslexias have been described as a type of acquired dyslexia which is marked by problems in processing the visual factors of terms and, not like other dyslexias, originates from an injury to the system of visual analysis. Hemianopsia is associated with this condition and is a visual field loss on the left/right side of the vertical midline.
Pure dyslexia (phonologically based), also known as agnosic dyslexia, dyslexia without agraphia, and pure word blindness, is dyslexia due to difficulty recognizing written sequences of letters (such as words), or sometimes even letters. It is 'pure' because it is not accompanied by other (significant) language-related impairments. Pure dyslexia does not include speech, handwriting style, language, or comprehension impairments. Pure dyslexia is caused by lesions on the visual word form area (VWFA). The VWFA is composed of the left lateral occipital sulcus and is activated during reading. A lesion in the VWFA stops transmission between the visual cortex and the left angular gyrus. It can also be caused by a lesion involving the left occipital lobe and the splenium of the corpus callosum. It is usually accompanied by a homonymous hemianopsia in the right side of the visual field. Multiple oral re-reading (MOR) is a treatment for pure dyslexia. It is considered a top-down processing technique in which patients read and re-read texts a predetermined number of times or until reading speed or accuracy improves a predetermined amount.
Commonly considered to derive from visual field loss due to damage to the primary visual cortex. Sufferers may complain of slow reading but are able to read individual words normally. This is the most common form of peripheral alexia, and the form with the best evidence of effective treatments.
In neglect dyslexia, some letters are neglected (skipped or misread) during reading – most commonly the letters at the beginning or left side of words. This alexia is associated with right parietal lesions. Use of prism glasses in treatment has been demonstrated to produce substantial benefit.
People with attentional dyslexia complain of letter crowding or migration, sometimes blending elements of two words into one. Sufferers perform better when word stimuli are presented in isolation rather than flanked by other words and letters. Using a large magnifying glass may help as this may reduce the effects of flanking from nearby words; however, no trials of this or indeed any other therapy for left parietal syndromes have been published as of 2014.
Through use of compensation strategies, therapy, and educational support dyslexic individuals can learn to read and write. There are techniques and technical aids that help manage or conceal symptoms of the disorder. Removing stress and anxiety alone can sometimes improve written comprehension. For dyslexia intervention with alphabet writing systems, the fundamental aim is to increase a child's awareness of correspondences between graphemes (letters) and phonemes (sounds), and to relate these to reading and spelling by teaching blending of the sounds into words. It has been found that reinforced collateral training focused towards visual language (reading) and orthography (spelling) yields longer-lasting gains than only oral phonological training. Early intervention – when language areas of the brain are developing – is most successful in reducing long-term impacts of dyslexia. There is some evidence that use of specially tailored fonts may be helpful. Among these fonts are Dyslexie, OpenDyslexic and Lexia Readable which were created with the notion that many of the letters in the Latin alphabet are visually similar and may therefore be confusing for people with dyslexia. Dyslexie, along with OpenDyslexic, puts emphasis on making each letter more unique in order to be identified easier. Font design can have an effect on reading, reading time and the perception of legibility, this is true for all readers, including those who have dyslexia and those who do not.
There have been many studies done regarding intervention, as a result one such meta-analysis found that there was functional activation as a result. Some test results indicate how to carry out teaching strategies.
From an early age, children as they age into adults with dyslexia, require instruction for word analysis and spelling, however, there are fonts which can help the reader better comprehend the material before them. The prognosis, generally speaking is positive for individuals who are identified in childhood, but who also have support from friends and family.
The percentage of people with dyslexia is unknown but it is estimated to vary between 1 to 33 percent of the population. An average estimate is 3 to 4 percent of a given population. Internationally there are different definitions of dyslexia, but despite significant differences in writing systems different populations suffer similarly from dyslexia. Dyslexia is not limited to difficulty in converting letters to sounds, and Chinese dyslexics have difficulty in extracting shapes of Chinese characters into meanings.
Dyslexia was identified by Oswald Berkhan in 1881, but the term dyslexia was coined in 1887 by Rudolf Berlin, an ophthalmologist in Stuttgart. He used the term to refer to a case of a young boy who had a severe impairment in learning to read and write despite showing typical intelligence and physical abilities in all other respects. In 1896, W. Pringle Morgan, a British physician from Seaford, East Sussex published a description of a reading-specific learning disorder in a report to the British Medical Journal titled "Congenital Word Blindness". The distinction between phonological and surface types of Dyslexia is only descriptive, and devoid of any etiological assumption as to the underlying brain mechanisms. However, studies have alluded to potential differences due to variation in performance.
Research and society
The majority of currently available dyslexia research relates to alphabetic writing systems, and especially to European languages. However, substantial research is also available regarding dyslexia in speakers of Arabic, Chinese, Hebrew, as well as other languages.
As is the case with any disorder, society often makes an assessment based on incomplete information. At the end of the 20th century (1980's) dyslexia was thought a consequence of education, rather than a basic disability. As a result, society often misjudges those afflicted with the disorder. Sometimes there is a lack of positive attitude in the work environment towards certain people with dyslexia.
- "What are reading disorders?". National Institutes of Health. Retrieved 15 March 2015.
- "NINDS Dyslexia Information Page". National Institute of Neurological Disorders and Stroke. National Institutes of Health. 30 September 2011. Retrieved 29 April 2015.
- "What are the symptoms of reading disorders?". National Institutes of Health. Retrieved 15 March 2015.
- Peterson, RL; Pennington, BF (26 May 2012). "Developmental dyslexia." (PDF). Lancet 379 (9830): 1997–2007. doi:10.1016/s0140-6736(12)60198-6. PMID 22513218.
- "How are reading disorders diagnosed?". National Institutes of Health. Retrieved 15 March 2015.
- "What are common treatments for reading disorders?". National Institutes of Health. Retrieved 15 March 2015.
- Handler, SM; Fierson, WM; Section on, Ophthalmology; Council on Children with, Disabilities; American Academy of, Ophthalmology; American Association for Pediatric Ophthalmology and, Strabismus; American Association of Certified, Orthoptists (March 2011). "Learning disabilities, dyslexia, and vision.". Pediatrics 127 (3): e818–56. doi:10.1542/peds.2010-3670. PMID 21357342.
- Darcy Ann Umphred; Rolando T. Lazaro; Margaret Roller; Gordon Burton (2013). Neurological Rehabilitation. Elsevier Health Sciences. p. 383. ISBN 978-0-323-26649-9.
- Kooij, J. J. Sandra (2013). Adult ADHD diagnostic assessment and treatment (3rd ed. ed.). London: Springer. p. 83. ISBN 9781447141389.
- "How many people are affected by/at risk for reading disorders?". National Institutes of Health. Retrieved 15 March 2015.
- Campbell, Robert Jean (2009). Campbell's Psychiatric Dictionary. Oxford University Press. pp. 310–312. ISBN 978-0-19-534159-1.
- Lyytinen, Heikki (November 2009). "In Search of a Science Based Application:Learning Tool for Reading Acquisition". Scandinavian Journal of Psychology. 50(6): 668–675. doi:10.1111/j.1467-9450.2009.00791.x. PMID 19930268.
- Sylvia Phillips; Kathleen Kelly; Liz Symes (2013). Assessment of Learners with Dyslexic-Type Difficulties. SAGE. p. 7. ISBN 978-1-4462-8704-0.
- Woollams, Anna M. (9 December 2013). "Connectionist neuropsychology: uncovering ultimate causes of acquired dyslexia". Philosophical Translations of the Royal Society of London; Series B, Biological Sciences 369 (1634): 20120398. doi:10.1098/rstb.2012.0398. PMC 3866427. PMID 24324241. Retrieved 13 February 2015.
- Heilman, Kenneth M.; Valenstein, Edward (2011). Clinical Neuropsychology. Oxford University Press. pp. 115–116. ISBN 978-0-19-538487-1.
- Michael Spivey; Marc Joanisse; Ken McRae (2012). The Cambridge Handbook of Psycholinguistics. Cambridge University Press. pp. 219–220. ISBN 978-0-521-67792-9.
- Hamada, Hiroshi; Tam, Patrick P.L. (December 2014). "Mechanisms of left-right asymmetry and patterning: driver, mediator and responder". F1000 Prime Reports. Retrieved 13 February 2015.
- Schott, G. D. (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.
- "Dyslexia and Related Disorders" (PDF). Alabama Dyslexia Association. International Dyslexia Association. January 2003. Retrieved 29 April 2015.
- Peer, Lindsay; Reid, Gavin (2014). Multilingualism, Literacy and Dyslexia. Routledge. p. 219. ISBN 978-1-136-60899-5.
- Sally E. Shaywitz; Bennett A Shaywitz (2013). "Chapter 34 Making a Hidden Disability Visible: What Has Been Learned from Neurobiological Studies of Dyslexia". In H. Lee Swanson; Karen R. Harris; Steve Graham. Handbook of Learning Disabilities (2 ed.). Guilford Press. ISBN 978-1-4625-0856-3.
- Jarrad, Lum (October 2013). "Procedural learning is impaired in dyslexia: evidence from a meta-analysis of serial reaction time studies.". Research of Developmental Disabilities 34: 3460–76. doi:10.1016/j.ridd.2013.07.017. PMC 3784964. PMID 23920029.
- "Myth 17: The Defining Feature of Dyslexia Is Reversing Letters". Association for psychological science. Retrieved 15 March 2015.
- Eraldo Paulesu, Nicola Brunswick, and Federica Paganelli. "Cross-cultural differences in unimpaired and dyslexic reading: Behavioral and functional anatomical observations in readers of regular and irregular orthographies. Chapter 12 in Reading and Dyslexia in Different Orthographies. Eds. Nicola Brunswick, Sine McDougall, and Paul de Mornay Davies. Psychology Press, 2010. ISBN 9781135167813
- Connie Juel (2013). "The Impact of Early School Experiences on Initial Reading". In David K. Dickinson; Susan B. Neuman. Handbook of Early Literacy Research. Guilford Publications. ISBN 978-1-4625-1470-0.
- Kathrin Klingebiel; Brendan S. Weekes (2009). "Chapter 8: Developmental Dyslexia in Chinese: Behavioral, Genetic, and Neuropsychological Issues". In Sam-po Law; Brendan Weekes; Anita M-Y. Wong. Language Disorders in Speakers of Chinese. Multilingual Matters.
- Nicolson, R. I.; Fawcett, A. J. (September 2009). "Dyslexia, dysgraphia, procedural learning and the cerebellum". Cortex 47 (1): 117–27. doi:10.1016/j.cortex.2009.08.016. PMID 19818437.
- Reynolds, Cecil R.; Fletcher-Janzen, Elaine (2 January 2007). Encyclopedia of Special Education. John Wiley & Sons. p. 771. ISBN 978-0-471-67798-7.
- Ronald Comer; Elizabeth Gould (January 19, 2010). Psychology Around Us. John Wiley & Sons. p. 1. ISBN 978-0-471-38519-6.
- Germanò, E; Gagliano, A; Curatolo, P (2010). "Comorbidity of ADHD and Dyslexia" (PDF). Developmental Neuropsychology 35 (5): 475–493. doi:10.1080/87565641.2010.494748. PMID 20721770.
- S. Hossein Fatemi; Norman Sartorius; Paula J. Clayton (2008). The Medical Basis of Psychiatry (3 ed.). Springer Science & Business Media. p. 308. ISBN 978-1-59745-252-6.
- Simone Aparecida Capellini (2007). Neuropsycholinguistic Perspectives on Dyslexia and Other Learning Disabilities. Nova Publishers. p. 94. ISBN 978-1-60021-537-7.
- Moore, D. R. (July 2011). "The diagnosis and management of auditory processing disorder". Lang Speech Hear Serv Sch 42 (3): 303–8. doi:10.1044/0161-1461(2011/10-0032). PMID 21757566.
- Pammer, Kristen (January 2014). "Brain mechanisms and reading remediation: more questions than answers.". Scientifica 2014: 802741. doi:10.1155/2014/802741. PMC 3913493. PMID 24527259.
- Law, J (2014). "relationship of phonological ability, speech perception, and auditory perception in adults with dyslexia". Frontiers in human neuroscience 8: 482. doi:10.3389/fnhum.2014.00482. PMC 4078926. PMID 25071512.
- Susan J. Pickering (2012). "Chapter 2. Working Memory in Dyslexia". In Tracy Packiam Alloway; Susan E. Gathercole. Working Memory and Neurodevelopmental Disorders. Psychology Press. ISBN 978-1-135-42134-2.
- Paulesu, Eraldo; Danelli, Laura; Berlingeri, Manuela (November 2014). "Reading the dyslexic brain: multiple dysfunctional routes revealed by a new meta-analysis of PET and fMRI activation studies". Frontiers in Human Neuroscience 8. doi:10.3389/fnhum.2014.00830. PMC 4227573. PMID 25426043.
- Berkhan O (1917). "Über die Wortblindheit, ein Stammeln im Sprechen und Schreiben, ein Fehl im Lesen" [About word blindness, adyslalia of speech and writing, a weakness in reading]. Neurologisches Centralblatt (in German) 36: 914–27.
- Gavin Reid; Angela Fawcett; Frank Manis; Linda Siegel (2008). The SAGE Handbook of Dyslexia. SAGE Publications. p. 127. ISBN 978-1-84860-037-9.
- Stein, John (2014). "Dyslexia: the Role of Vision and Visual Attention". Current Developmental Disorders Reports 1 (4): 267–80. doi:10.1007/s40474-014-0030-6. PMC 4203994. PMID 25346883.
- "Science Daily".
- Harry A. Whitaker (2010). Concise Encyclopedia of Brain and Language. Elsevier. p. 180. ISBN 978-0-08-096499-7.
- Price, cathy (August 16, 2012). "A Review and Synthesis of the first 20 years of Pet and fMRI studies of heard Speech,Spoken Language and Reading". Neuroimage. 62(2): 816–847. doi:10.1016/j.neuroimage.2012.04.062. PMC 3398395. PMID 3398395. Retrieved 5 February 2015.
- Sharifi, S (May 2014). "Neuroimaging essentials in essential tremor: a systematic review.". Neuroimage Clinical 5: 217–231. doi:10.1016/j.nicl.2014.05.003. PMC 4110352. PMID 25068111.
- Brandler, William (February 2014). "The genetic relationship between handedness and neurodevelopmental disorders.". Trends in molecular medicine 20: 83–90. doi:10.1016/j.molmed.2013.10.008. PMC 3969300. PMID 24275328.
- Cain, Kate (2010). Reading development and dificulties (1st ed.). TJ International. p. 134. Retrieved 21 March 2015.
- Levav, Itzhak (2009). Psychiatric and Behavioral Disorders in Israel: From Epidemiology to Mental health. Green Publishing. p. 52. Retrieved 21 March 2015.
- Faust, Miriam (2012). The Handbook of the Neuropsychology of Language. John Wiley & Sons. pp. 941–43. ISBN 978-1-4443-3040-3.
- Benitez, A (November 2010). "Neurobiology and neurogenetics of dyslexia". Neurology (in spanish) 25: 563–81. doi:10.1016/j.nrl.2009.12.010. PMID 21093706. Retrieved 13 February 2015.
- Kere, Julia (September 2014). "The molecular genetics and neurobiology of developmental dyslexia as model of a complex phenotype.". Biochemical and biophysical research communication 452: 236–43. doi:10.1016/j.bbrc.2014.07.102. Retrieved 14 February 2015.
- Marshall, Chloë R. (2012). Current Issues in Developmental Disorders. Psychology Press. pp. 53–56. ISBN 978-1-136-23067-7.
- Rosen, Glenn D. (2013). The Dyslexic Brain: New Pathways in Neuroscience Discovery. Psychology Press. p. 342. ISBN 1-134-81550-6.
- Friend, A; Defries, J. C.; Olson, R. K. (November 2008). "Parental Education Moderates Genetic Influences on Reading Disability". Psychol Sci. 19 (11): 1124–30. doi:10.1111/j.1467-9280.2008.02213.x. PMC 2605635. PMID 19076484.
- Taylor, J.; Roehrig, A. D.; Hensler, B. Soden; Connor, C. M.; Schatschneider, C. (2010). "Teacher Quality Moderates the Genetic Effects on Early Reading". Science 328 (5977): 512–4. Bibcode:2010Sci...328..512T. doi:10.1126/science.1186149. PMC 2905841. PMID 20413504.
- Pennington, Bruce F.; McGrath, Lauren M.; Rosenberg, Jenni; Barnard, Holly; Smith, Shelley D.; Willcutt, Erik G.; Friend, Angela; Defries, John C.; Olson, Richard K. (January 2009). "Gene × Environment Interactions in Reading Disability and Attention-Deficit/Hyperactivity Disorder". Developmental Psychology 45 (1): 77–89. doi:10.1037/a0014549. PMC 2743891. PMID 19209992.
- Roth, Tania L.; Roth, Eric D.; Sweatt, J. David (September 2010). "Epigenetic regulation of genes in learning and memory". Essays in Biochemistry 48 (1): 263–74. doi:10.1042/bse0480263. PMID 20822498.
- Pritchard SC, Coltheart M, Palethorpe S, Castles A; Coltheart; Palethorpe; Castles (October 2012). "Nonword reading: comparing dual-route cascaded and connectionist dual-process models with human data". J Exp Psychol Hum Percept Perform 38 (5): 1268–88. doi:10.1037/a0026703. PMID 22309087.
- Michael Eysenck; Mark T. Keane (2013). Cognitive Psychology 6e. Psychology Press. p. 373. ISBN 1-134-44046-4.
- Michael Eysenck; Mark T. Keane (2013). Cognitive Psychology 6e. Psychology Press. p. 450. ISBN 1-134-44046-4.
- Hulme, Charles; Joshi, R. Malatesha; Snowling, Margaret J. (2012). Reading and Spelling: Development and Disorders. Routledge. p. 151. ISBN 978-1-136-49807-7.
- Sprenger-Charolles,, Liliane (2011). "Prevalence and Reliability of Phonological, Surface, and Mixed Profiles in Dyslexia: A Review of Studies Conducted in Languages Varying in Orthographic Depth". Scientific studies of reading 15: 498–521. doi:10.1080/10888438.2010.524463. Retrieved 11 March 2015.
- "Tests for Dyslexia and Learning Disabilities". University of Michigan. Retrieved 15 March 2015.
- Lindsay Peer; Gavin Reid (2013). Introduction to Dyslexia. Taylor & Francis. pp. 35–40. ISBN 978-1-135-37290-3.
- Verga, Laura (September 2013). "How relevant is social interaction in second language learning". Frontiers in human Neuroscience 7: 550. doi:10.3389/fnhum.2013.00550. PMC 3759854. PMID 24027521.
- Brandler, William M.; Paracchini, Silvia (2014). "The genetic relationship between handedness and neurodevelopmental disorders". Trends in Molecular Medicine 20 (2): 83–90. doi:10.1016/j.molmed.2013.10.008. PMC 3969300. PMID 24275328.
- Wilson, Stephen (March 2013). "Dysfunctional visual word form processing in progressive alexia". Brain: 1260–73. doi:10.1093/brain/awt034. Retrieved 7 February 2015.
- Johnson, Juliene (April 2013). "Jean-Martin Charcot's role in the 19th century study of music aphasia". Brain: 1662–70. doi:10.1093/brain/awt055. Retrieved 7 February 2015.
- Harley, Trevor (2014). The Psychology of Language: From Data to Theory (4th ed.). Psychology Press. p. 227. Retrieved 14 February 2015.
- Wandell, Brian (January 2012). "Learning to See Words". Annual Review of Psychology 63: 31–53. doi:10.1146/annurev-psych-120710-100434. PMC 3228885. PMID 21801018.
- Vandermosten, Maaike (2012). "tractography study in dyslexia: neuroanatomic correlates of orthographic, phonological and speech processing". Brain. doi:10.1093/brain/awr363. Retrieved 4 March 2015.
- Susan Ayers; Andrew Baum; Chris McManus; Stanton Newman; Kenneth Wallston; John Weinman; Robert West (2007). Cambridge Handbook of Psychology, Health and Medicine. Cambridge University Press. p. 689. ISBN 978-1-139-46526-7.
- Heim, Stefan; Wehnelt, Anke; Grande, Marion; Huber, Walter; Amunts, Katrin (May 2013). "Effects of lexicality and word frequency on brain activation in dyslexic readers". Brain and Language 125 (2): 194–202. doi:10.1016/j.bandl.2011.12.005. PMID 22230039.
- Nancy Mather; Barbara J. Wendling (2011). Essentials of Dyslexia Assessment and Intervention. John Wiley & Sons. p. 272. ISBN 978-1-118-15266-9.
- Beeson, Pélagie M.; Rising, Kindle; Kim, Esther S.; Rapcsak, Steven Z. (April 2010). "A Treatment Sequence for Phonological Alexia/Agraphia". Journal of Speech, Language, and Hearing Research 53 (2): 450–68. doi:10.1044/1092-4388(2009/08-0229). PMC 3522177. PMID 20360466.
- Joseph M. Tonkonogy; Antonio E. Puente (2009). Localization of Clinical Syndromes in Neuropsychology and Neuroscience. Springer Publishing Company. p. 409. ISBN 978-0-8261-1968-1.
- Jeffries, Elizabeth (April 2007). "Do Deep Dyslexia , Dysgraphia,and Dysphasia share a common phonological impairment?". Neuropsycologia 45: 1553–70. doi:10.1016/j.neuropsychologia.2006.12.002. PMC 1894936. PMID 17227679.
- Levi, Dennis (February 2008). "Crowding an essential bottleneck for object recognition: a mini-review.". Vision Research 48: 635–54. doi:10.1016/j.visres.2007.12.009. PMC 2268888. PMID 18226828.
- Yanoff, Myron (2009). Ophthalmology (2nd ed.). Mosby Elsevier. p. 1092. ISBN 978-0-323-04332-8. Retrieved 14 February 2015.
- Brown, Thomas E. (2009). ADHD Comorbidities: Handbook for ADHD Complications in Children and Adults. American Psychiatric Pub. p. 236. ISBN 978-1-58562-158-3.
- Starrfelt, Randi; Ólafsdóttir, Rannveig Rós; Arendt, Ida-Marie (2013). "Rehabilitation of pure alexia: A review". Neuropsychological Rehabilitation 23 (5): 755–79. doi:10.1080/09602011.2013.809661. PMC 3805423. PMID 23808895.
- Argye E. Hillis (2013). The Handbook of Adult Language Disorders. Psychology Press. p. 40. ISBN 1-134-94801-8.
- Ilias Papathanasiou; Patrick Coppens; Constantin Potagas (2012). Aphasia and Related Neurogenic Communication Disorders. Jones & Bartlett Publishers. p. 168. ISBN 978-1-4496-8435-8.
- François Boller; Jordan Grafman (2010). Handbook of Neuropsychology: Disorders of visual behavior. Gulf Professional Publishing. p. 31. ISBN 978-0-444-50369-5.
- Schuett, Susanne (2009). "The rehabilitation of hemianopic dyslexia". Nature Reviews Neurology 5 (8): 427–37. doi:10.1038/nrneurol.2009.97. PMID 19581901.
- Martha J. Farah; Graham Ratcliff (2013). The Neuropsychology of High-level Vision. Psychology Press. pp. 177–179. ISBN 978-1-135-80652-1.
- Comer, Ronald (2011). Psychology Around Us. RR Donnelly. p. 232. Retrieved 14 February 2015.
- Jean-Michel, H (August 2012). "Synaesthesia, subjective expression of a neuronal palimpsest?". Medicine Sciences (in French): 765–771. Retrieved 13 February 2015.
- Bogon, Johanna; Finke, Kathrin; Stenneken, Prisca (16 October 2014). "TVA-based assessment of visual attentional functions in developmental dyslexia". Frontiers in Psychology 5: 1172. doi:10.3389/fpsyg.2014.01172. PMC 4199262. PMID 25360129.
- de Leeuw, Renske (December 2010). "Special Font For Dyslexia?" (PDF) (in English and Dutch). University of Twente. p. 32. Archived (PDF) from the original on 1 November 2011.
- Bogon, Johana (October 2014). "TVA based assessment of visual attention functions in developmental dyslexia". Frontiers in Psychology 5: 1172. doi:10.3389/fpsyg.2014.01172. PMC 4199262. PMID 25360129.
- Nicola Brunswick (10 April 2012). Supporting Dyslexic Adults in Higher Education and the Workplace. John Wiley & Sons. pp. 115–. ISBN 978-0-470-97479-7. Retrieved 10 April 2012.
- Schulte-Körne, G (October 2010). "The prevention, diagnosis, and treatment of dyslexia". Dtsch Arztebl Int 107: 718–26. doi:10.3238/arztebl.2010.0718. PMC 2967798. PMID 21046003.
- Lyytinen, Heikki, Erskine, Jane, Aro, Mikko, Richardson, Ulla (2009). "Reading and reading disorders". In Hoff, Erika. Blackwell Handbook of Language Development. Blackwell. pp. 454–474. ISBN 978-1-4051-9459-4.
- Sawers, Paul. "Dyslexie: A typeface for dyslexics". Retrieved 9 April 2012.
- "3 Things to Know About Dyslexic Fonts". International Dyslexia Association. Retrieved 28 February 2015.
- Barquero, Laura (2014). "Neuroimaging of reading intervention". PLOS one 9: e83668. doi:10.1371/journal.pone.0083668. PMC 3888398. PMID 24427278.
- "Screening and assessment". British Dyslexia Association. Retrieved 11 March 2015.
- Fletcher, Jack (2009). "Dyslexia: the evolution of a scientific concept". Journal of international neuropsychology society 15: 501–508. doi:10.1017/S1355617709090900. PMC 3079378. PMID 19573267.
- O’Hare, Anne (2010). "Dyslexia: what do paediatricians need to know?". Pediatrics and Child health 20: 338–343. doi:10.1016/j.paed.2010.04.004. Retrieved 11 March 2015.
- Wei, Hu (May 2010). "Developmental dyslexia in Chinese and English populations: dissociating the effect of dyslexia from language differences". Brain: 1694–06. doi:10.1093/brain/awq106. Retrieved 7 February 2015.
- Protopapas, Athanassios (2013). "From temporal processing to developmental language disorders: mind the gap.". Philosophical transactions of the Royal Sociey of LondonSeries B, Biological Sciences 369: 20130090. doi:10.1098/rstb.2013.0090. PMC 3866431. PMID 24324245. Retrieved 14 February 2015.
- Zhao, Jing (November 2014). "The visual magnocellular-dorsal dysfunction in Chinese children with developmental dyslexia impedes Chinese character recognition.". Scientific reports 4: 7068. doi:10.1038/srep07068. PMC 4238300. PMID 25412386.
- Chloe Marshall (2012). Current Issues in Developmental Disorders. Psychology Press. p. 152. ISBN 978-1-84872-084-8.
- "Writing". Britannica. Encyclopædia Britannica. Retrieved 29 January 2015.
- "Über Dyslexie" [About dyslexia]. Archiv für Psychiatrie 15: 276–278. 1884.
- Annual of the Universal Medical Sciences and Analytical Index: A Yearly Report of the Progress of the General Sanitary Sciences Throughout the World. F. A. Davis Company. 1888. p. 39.
- Brooks, Patricia (2014). Encyclopedia of language development. SAGE. p. 30. Retrieved 4 March 2015.
- Mishra, Srikanta K. (October 2014). "Medial efferent mechanisms in children with auditory processing disorders.". Frontiers in human neuroscience 8: 860. doi:10.3389/fnhum.2014.00860. PMC 4209830. PMID 25386132. Retrieved 14 February 2015.
- Reid, Gavin (2012). The Routledge Companion to Dyslexia. Routledge. p. 16. ISBN 978-1-136-61710-2.
- Richlan, Fabio (May 2014). "Functional neuroanatomy of developmental dyslexia; the role of orthographic depth". Frontiers in human neuroscience 8: 347. doi:10.3389/fnhum.2014.00347. PMC 4033006. PMID 24904383. Retrieved 14 February 2015.
- Korne, Gerd (2010). "The prevention diagnosis and treatment of dyslexia". Deutches International 107: 718–727. doi:10.3238/arztebl.2010.0718. PMC 2967798. PMID 21046003.
- de Berr, J (2014). "Factors influencing work participation of adults with developmental dyslexia". BMC Public Health 14: 77. doi:10.1186/1471-2458-14-77. PMC 3913008. PMID 24460949.
- Agnew, Susie; Stewart, Jackie; Redgrave, Steve (2014). Dyslexia and Us: A collection of personal stories. Andrews UK Limited. ISBN 978-1-78333-250-2.
- Alan Beaton (2004). Dyslexia, Reading and the Brain: A Sourcebook of Psychological and Biological Research. Psychology Press. ISBN 978-1-135-42275-2.
- Julian G. Elliott; Elena L. Grigorenko (2014). The Dyslexia Debate. Cambridge University Press. ISBN 978-0-521-11986-3.
- Andrew W. Ellis (2014). Reading, Writing and Dyslexia: A Cognitive Analysis. Psychology Press. ISBN 978-1-317-71630-3.
- Gavin Reid (2011). Dyslexia (3 ed.). A&C Black. ISBN 978-1-4411-6585-5.
- Gavin Reid; Angela Fawcett (2008). Dyslexia in Context: Research, Policy and Practice. John Wiley & Sons. ISBN 978-0-470-77801-2.
- Thomas Richard Miles (2006). Fifty Years in Dyslexia Research. Wiley. ISBN 978-0-470-02747-9.
- Mark Selikowitz (2012). Dyslexia and Other Learning Difficulties. Oxford University Press. ISBN 978-0-19-969177-7.
- Michael Thomson (2009). The Psychology of Dyslexia: A Handbook for Teachers with Case Studies. John Wiley & Sons. ISBN 978-0-470-74197-9.
|Library resources about
|Wikimedia Commons has media related to Dyslexia.|
- Dyslexia associations
- International Dyslexia Association
- British Dyslexia Association
- European Dyslexia Dyslexia Association
- Australian Dyslexia Association