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Dysgraphia

From Wikipedia, the free encyclopedia
For the acquired neurological disorder that causes a loss in the ability to communicate through writing, see Agraphia.
Dysgraphia
Other namesDisorder of written expression
Three handwritten repetitions of the phrase "The quick brown fox jumps over the lazy dog" on lined paper. The writing, by an adult with dysgraphia, exhibits variations in letter formation, inconsistent spacing, and irregular alignment, all key characteristics of the condition.
SpecialtyNeurology, Pediatrics
SymptomsPoor and inconsistent handwriting, Poor spelling and spacing, Other transcription difficulties in absence of oral language difficulties
Usual onsetEarly school age
DurationLifelong
TypesLinguistic Dysgraphia, Motor Dysgraphia, Spatial Dysgraphia
CausesGenetic and Neurological factors
Risk factorsFamily History, Co-occurring Developmental Disabilities
Differential diagnosisdyslexia, written language learning disability [1]

Dysgraphia (also known as Velthuritis) is a neurological disorder[2] and learning disability that concerns impairments in written expression, which affects the ability to write, primarily handwriting, but also coherence. It is a specific learning disability (SLD) as well as a transcription disability, meaning that it is a writing disorder associated with impaired handwriting, orthographic coding and finger sequencing (the movement of muscles required to write).[3] It often overlaps with other learning disabilities and neurodevelopmental disorders such as speech impairment, attention deficit hyperactivity disorder (ADHD) or developmental coordination disorder (DCD).[4]

In the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), dysgraphia is characterized as a neurodevelopmental disorder[5] under the umbrella category of specific learning disorder.[6] Dysgraphia is when one's writing skills are below those expected given a person's age measured through intelligence and age-appropriate education. The DSM is unclear in whether writing refers only to the motor skills involved in writing, or if it also includes orthographic skills and spelling.[4]

Dysgraphia should be distinguished from agraphia (sometimes called acquired dysgraphia), which is an acquired loss of the ability to write resulting from brain injury, progressive illness, or a stroke.[7]

The prevalence of dysgraphia throughout the world is not known, due to difficulties in diagnosis and lack of research.

Etymology

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The word dysgraphia comes from the Greek words dys meaning "impaired" and γραφία graphía meaning "writing by hand".[3]

Development

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There are at least two stages in the act of writing: the linguistic stage and the motor-expressive-praxic stage. The linguistic stage involves the encoding of auditory and visual information into symbols for letters and written words. This is mediated through the angular gyrus, which provides the linguistic rules which guide writing. The motor stage is where the expression of written words or graphemes is articulated. This stage is mediated by Exner's writing area of the frontal lobe.[8]

The condition can cause individuals to struggle with feedback and anticipating and exercising control over rhythm and timing throughout the writing process.[9]

People with dysgraphia often write on some level and may experience difficulty with other activities requiring reciprocal movement of their fingers[9] and other fine motor skills, such as; tying shoes, fastening buttons or playing certain musical instruments. However, dysgraphia does not affect all fine motor skills. People with dysgraphia often have unusual difficulty with handwriting and spelling,[3] which in turn can cause writing fatigue.[4] Unlike people without transcription disabilities, they tend to fail to preserve the size and shape of the letters they produce if they cannot look at what they are writing. They may lack basic grammar and spelling skills (for example, having difficulties with the letters p, q, b, and d), and often will write the wrong word when trying to formulate their thoughts on paper. The disorder generally emerges when the child is first introduced to writing.[3] There is accumulating evidence that, in many cases, individuals with SLDs and DCD do not outgrow their disorders.[10] Accordingly, it has been found that adults, teenagers, and children alike are all subject to dysgraphia.[11] Studies have shown that higher education students with developmental dysgraphia still experience significant difficulty with hand writing, fine motor skills and motor-related daily functions when compared to their peers without neurodevelopmental disorders.[12]

Classification

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Dysgraphia is nearly always accompanied by other learning disabilities and/or neurodevelopmental disorders such as dyslexia, attention deficit hyperactivity disorder, or oral and written language learning disability (OWL LD) [3][13] and this can impact the type of dysgraphia a person has. Tourette syndrome, ASD and dyspraxia are also common diagnoses among dysgraphic individuals.[14][15][16] Developmental dysgraphia was originally described as being a disorder that occurs solely in dyslexic individuals. Dysgraphia was not studied as a separate entity until mid-20th century when researchers discovered there were different types that occur without dyslexia.[17] Dyslexics and dysgraphics experience similar synchronization difficulties and issues with spelling. However, dyslexia does not seem to impair physical writing ability or dramatically impact fine motor skills and dysgraphia does not impact reading comprehension.[4] Methods for evaluating, managing and remedying dysgraphia are still evolving,[17] but there are three principal subtypes of dysgraphia that are recognized. There is little information available about different types of dysgraphia and there are likely more subtypes than the ones listed below. Some people may have a combination of two or more of these, and individual symptoms may vary in presentation from what is described here. Most common presentation is a motor agraphia resulting from damage to some part of the motor cortex in the parietal lobes.[citation needed]

Dyslexic

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There are several features that distinguish dyslexic-dysgraphia (sometimes called linguistic dysgraphia) from the other types. People with dyslexic-dysgraphia typically have poor oral and written spelling that is typically phonemic in nature. Their spontaneously written work is often illegible, has extra or deleted syllables or letters, and contains unnecessary capitalization or large spaces in the middle of words which can make each individual word unrecognizable. They may also insert symbols that do not resemble any letter of the alphabet. Writing production generally requires long periods of contemplation and correction.[18]

Dyslexic-dysgraphic individuals have fairly good copied work, and their ability to draw is also preserved. Their finger tapping speed (a method for identifying fine motor problems) is normal, indicating that the deficit does not likely stem from cerebellar damage.[17] Impaired verbal executive functioning has also been related to this form of the disorder.[16]

One study found that boys with ADHD and dysgraphia struggle primarily with motor planning rather than have a linguistic impairment but the prevalence of linguistic/dyslexic-dysgraphia compared to other subtypes is uncertain.[4]

Motor

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Dysgraphia can be difficult to diagnose because the handwriting starts out clear and slowly degrades, making the writer appear lazy.

Motor dysgraphia (sometimes called peripheral dysgraphia)[16] is due to deficient fine motor skills, poor dexterity, poor muscle tone or unspecified motor clumsiness. Motor dysgraphia impairs both motor patterns and motor memory.[9] Letter formation may be acceptable in very short samples of writing, but this requires extreme effort and an unreasonable amount of time to accomplish, and it cannot be sustained for a significant length of time, as it can cause arthritis-like tensing of the hand. Overall, their written work is poor to illegible even if copied by sight from another document, and drawing is impaired. Oral spelling for these individuals is normal, and their finger tapping speed is below normal. This shows that there are problems within the fine motor skills of these individuals. People with developmental coordination disorder may be dysgraphic and motor-dysgraphia may serve as a marker of dyspraxia.[19] Motor-dysgraphics struggle with proper finger grip and writing is often slanted due to holding a pen or pencil incorrectly.[3][9] Average writing speed is slower than that of non-dysgrapic individuals, but this seems to improve with age. Motor skill deficits appears to be a common cause of dysgraphia; 78% of children with the disorder present kinematic difficulties, while 58% of them display issues with pressure skills.[20]

Spatial

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A person with spatial dysgraphia has an impairment in the understanding of space. This impaired spatial perception causes illegible spontaneously written work, illegible copied work, abnormal spacing between letters and majorly impaired drawing abilities. They have normal oral spelling and normal finger tapping speed, suggesting that this subtype is not fine motor based.[16] Symptoms in actuality may vary in presentation from what is listed here.[citation needed] Spatial dysgraphia may develop in individuals with lesions on the right hemisphere of the brain.[15]

Miscellaneous

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Other subtypes and informal classification systems have been proposed by researchers; this includes but is not limited to phonological dysgraphia,[21] deep dysgraphia and surface dysgraphia.[17][15]

Signs and symptoms

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The symptoms to dysgraphia are often overlooked or attributed to the student being lazy, unmotivated, careless or anxious. The condition may also be dismissed as simply being an expression of attention deficiency or having delayed visual-motor processing. In order to be diagnosed with dysgraphia, one must have a cluster, but not necessarily all, of the following symptoms:[3][9][4]

  • Poor legibility
  • Excessive erasures
  • Misuse of lines and margins
  • Poor spatial planning on paper
  • Relies heavily on vision to write
  • Irregular letter sizes and shapes
  • Frequent reliance on verbal cues
  • Inattentiveness over details when writing
  • Mixed upper case and lower case letters
  • Switching between cursive and print letters
  • Difficulty visualizing letter formation beforehand
  • Slow writing speed or inefficient speed of copying
  • Inconsistent form and size of letters, or unfinished letters
  • Difficulty understanding homophones and what spelling to use[22]
  • Handwriting abilities that interfere with spelling and written composition
  • Struggles with translating ideas to writing, sometimes using the wrong words altogether
  • Issues following rules of sentence structure or grammar when writing, but not when speaking[23]
  • Tight, awkward or painful grip of writing utensil[23] or feeling pain while writing (eg; cramps in fingers, wrist and palms)[3]
  • Odd wrist, arm, body, or paper orientations (eg; bending arm into an L shape, holding paper down with non-dominant hand)
  • Synchronization difficulties like writing and thinking at the same time (eg; creative writing, taking notes, tapping and judging line orientation concurrently)
  • Slow development of essential skills such as shoe tying

The symptoms of dysgraphia can change as one ages.[23] Dysgraphia may cause students emotional trauma often due to the fact that no one can read their writing, and they are aware that they are not performing to the same level as their peers. Emotional problems that may occur alongside dysgraphia include impaired self-esteem, lowered self-efficacy, reduced motivation, poorer social functioning, heightened anxiety, and depression.[3][13][9][16] They may put in extra efforts in order to have the same achievements as their peers, but often get frustrated because they feel that their hard work does not pay off.[13] Dysgraphia is a hard disorder to detect as it does not affect specific ages, gender, or intelligence.[13] The main concern in trying to detect dysgraphia is that people hide their disability behind their verbal fluency/comprehension and strong syntax coding because they are ashamed that they cannot achieve the same goals as their peers.[13] Having dysgraphia is not related to a lack of cognitive ability,[3] and it is not uncommon in intellectually gifted individuals, but due to dysgraphia their intellectual abilities are often not identified.[13]

Associated conditions

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There are some common problems not related to dysgraphia but often associated with dysgraphia, the most common of which is stress. Developing an aversion to writing is another common issue. Often children (and adults) with dysgraphia will become extremely frustrated with the task of writing specially on plain paper (and spelling); younger children may cry, pout, or refuse to complete written assignments. This frustration can cause the student a great deal of stress and can lead to stress-related illnesses. This can be a result of any symptom of dysgraphia.[9][11][13]

Causes

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The underlying causes of the disorder are not fully understood,[15] but dysgraphia is known to be a biologically-based disorder with genetic and brain bases.[3] More specifically, it is a working memory problem[13] caused by specific neurodevelopmental dysfunction.[9] In dysgraphia, individuals fail to develop normal connections among different brain regions needed for writing.[13] People with dysgraphia have difficulty in automatically remembering and mastering the sequence of motor movements required to write letters or numbers.[3] Dysgraphia is also in part due to underlying problems in orthographic coding, the orthographic loop, and graphomotor output (the movements that result in writing) by one's hands, fingers and executive functions involved in letter writing.[3] The orthographic loop is when written words are stored in the mind's eye, connected through sequential finger movement for motor output through the hand with feedback from the eye.[13]

Family history of specific learning disabilities may play a role. Children with developmental dysphasia, developmental dysgraphia and developmental dyslexia may be more likely to have family members with one of these conditions.[15] Genetic studies suggest that verbal executive function tasks, orthographic skills, and spelling ability may have a genetic basis. Genes on chromosomes 6 and 15 may play some role with SLDs as they have linked to poorer reading, poorer spelling and lower phonemic awareness.[16]

Diagnosis

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Unlike specific learning disabilities and neurodevelopmental disorders that have been more extensively studied, there is no gold standard for diagnosing dysgraphia. This is likely due to writing systems often differing substantially between countries and languages and there being considerable heterogeneity among the therapists who are charged with diagnosing dysgraphia. Consequently, there are several tests that are used to diagnose dysgraphia like Ajuriaguerra scale, BHK for children or teenagers, the Minnesota Handwriting Assessment, ETCH, SCRIPT, DASH and HHE scale.[24][25]

With devices like drawing tablets, it is now possible to measure the position, tilt, and pressure in real time. From these features, it is possible to compute automatic features like speed and shaking and train a classifier to diagnose automatically children with atypical writing.[24] The features extracted have different importances in the classification through development and allow to characterize different subtypes of dysgraphia that could have different origins, outcomes and could require different remediation strategies.[26]

It is not uncommon for dysgraphic individuals to be intellectually gifted, possess a rich vocabulary and have strong comprehension of language when speaking or reading, though their disorder is often not detected or treated; which may also be in part to developmental dyslexia receiving far more academic and medical attention than developmental dysgraphia.[27] In addition, gifted children with transcription disabilities seldom receive programming for their intellectual talents due to their difficulties in completing written assignments.[3]

Treatment

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Treatment for dysgraphia varies and may include treatment for motor disorders to help control writing movements. Helping dysgraphic students overcome writing avoidance and accept the purpose and necessity of writing may be needed.[9] The use of occupational therapy can be effective in the school setting, and teachers should be well informed about dysgraphia to aid in carry-over of the occupational therapist's interventions. One common form of therapy is the use of Thera-putty, which helps develop dexterity. Treatments may address impaired memory or other neurological problems. Some physicians recommend that individuals with dysgraphia use computers to avoid the problems of handwriting. Speech-to-text programs have also been suggested as a potential treatments for dysgraphia. Speech-recognition technologies are used in two ways: dictation and computer control. As a dictation tool, spoken words are translated into written text; the student speaks the words into a microphone and the words are typed. The computer-control tool allows students to control the computer and software applications by speaking commands. If students are going to use speech-recognition software, they need to use consistent, clear speech. The use of computers also allows patients to experiment with different ergonomic keyboards. Today, there are many alternative keyboards for consideration. There are keyboards with enlarged and/or alphabetically arranged letters; there are key boards that are ergonomically designed; and there are mini keyboards for students who have a limited range of motion. Dysgraphia can sometimes be partially overcome with appropriate and conscious effort and training.[3] The International Dyslexia Association suggests the use of kinesthetic memory through early training by having the child overlearn how to write letters and to later practice writing with their eyes closed or averted to reinforce the feel of the letters being written. They also suggest teaching the students cursive writing as it has fewer reversible letters and can help lessen spacing problems, at least within words, because cursive letters are generally attached within a word.[citation needed] Many students see great success with cursive after extensive therapy.

Prevalence

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It has been estimated that up to 10% of children in the world are affected by disabilities like dysgraphia, dyslexia, dyscalculia and dyspraxia.[19][28] Estimates on the true prevalence of dysgraphia are not available due to lack of research on the disorder.

School

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There is no special education category for students with dysgraphia;[3] in the United States, The National Center for Learning Disabilities suggests that children with dysgraphia be handled in a case-by-case manner with an Individualized Education Program, or provided individual accommodation to provide alternative ways of submitting work and modify tasks to avoid the area of weakness. (It can often be difficult for students to have general accommodations for any student that might have dysgraphia as "Careful planning should precede all technology purchases, as many technologies are costly and school budgets are limited. In considering adoption of any of the technology recommended")[United States-centric][11] Students with dysgraphia often cannot complete written assignments that are legible, appropriate in length and content, or within given time.[3] It is suggested that students with dysgraphia receive specialized instructions that are appropriate for them. Children will mostly benefit from explicit and comprehensive instructions, help translating across multiple levels of language, and review and revision of assignments or writing methods.[13] Direct, explicit instruction on letter formation and guided practice will help students achieve automatic handwriting performance before they use letters to write words, phrases, and sentences.[3] Some older children may benefit from the use of a personal computer or a laptop in class so that they do not have to deal with the frustration of falling behind their peers.[13] Predictive text technology has been suggested as something that could greatly help students with dysgraphia. [29]

It is also suggested by Berninger that teachers with dysgraphic students decide if their focus will be on manuscript writing (printing) or keyboarding. In either case, it is beneficial that students are taught how to read cursive writing as it is used daily in classrooms by some teachers.[3] It may also be beneficial for the teacher to come up with other methods of assessing a child's knowledge other than written tests; an example would be oral testing. This causes less frustration for the child as they are able to get their knowledge across to the teacher without worrying about how to write their thoughts.[11] Dysgraphic students may benefit from special accommodation by their teachers when being required to write. Accommodations that may be helpful include but are not limited to; offering larger pencils or pencils with special grips, supplying paper with raised lines to provide tactile feedback, allowing extra time for classwork assignments, scaling down large written assignments and breaking down long written assignments into multiple shorter assignments.[16]

The number of students with dysgraphia may increase from 4 percent of students in primary grades, due to the overall difficulty of handwriting, and up to 20 percent in middle school because written compositions become more complex. With this in mind, there are no exact numbers of how many individuals have dysgraphia due to its difficulty to diagnose[3] and exact prevalence depends on the definition of dysgraphia. There are slight gender differences in association with written disabilities; overall it is found that males are more likely to be impaired with handwriting, composing, spelling, and orthographic abilities than females.[13][16]

The Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5) does not use the term dysgraphia but uses the phrase "an impairment in written expression" under the category of "specific learning disorder". This is the term used by most doctors and psychologists. To qualify for special education services, a child must have an issue named or described in the Individuals with Disabilities Education Act (IDEA). [United States-centric] While IDEA does not use the term "dysgraphia", it describes it under the category of "specific learning disability". [United States-centric] This includes issues with understanding or using language (spoken or written) that make it difficult to listen, think, speak, read, write, spell or to do mathematical calculations.[citation needed]

See also

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References

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  1. ^ Berninger VW, Richards T, Abbott RD (October 2015). "Differential Diagnosis of Dysgraphia, Dyslexia, and OWL LD: Behavioral and Neuroimaging Evidence". Reading and Writing. 28 (8): 1119–1153. doi:10.1007/s11145-015-9565-0. PMC 4553247. PMID 26336330.
  2. ^ "Dysgraphia". National Institute of Neurological Disorders and Stroke. Retrieved 2023-06-12.
  3. ^ a b c d e f g h i j k l m n o p q r s t Berninger VW, Wolf BJ (2009). Teaching Students with Dyslexia and Dysgraphia: Lessons from Teaching and Science. Baltimore, Maryland: Paul H. Brooks Publishing Co. ISBN 978-1-55766-934-6.
  4. ^ a b c d e f Nicolson RI, Fawcett AJ (January 2011). "Dyslexia, dysgraphia, procedural learning and the cerebellum". Cortex; A Journal Devoted to the Study of the Nervous System and Behavior. 47 (1): 117–27. doi:10.1016/j.cortex.2009.08.016. PMID 19818437. S2CID 32228208.
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  6. ^ "APA Dictionary of Psychology". dictionary.apa.org. Retrieved 2023-06-12.
  7. ^ Rodrigues, Jaqueline de Carvalho; Fontoura, Denise Ren da; Salles, Jerusa Fumagalli de (September 2014). "Acquired dysgraphia in adults following right or left-hemisphere stroke". Dementia & Neuropsychologia. 8 (3): 236–242. doi:10.1590/S1980-57642014DN83000007. ISSN 1980-5764. PMC 5619400. PMID 29213909.
  8. ^ Roux FE, Dufor O, Giussani C, Wamain Y, Draper L, Longcamp M, Démonet JF (October 2009). "The graphemic/motor frontal area Exner's area revisited". Annals of Neurology. 66 (4): 537–45. doi:10.1002/ana.21804. PMID 19847902. S2CID 205341904.
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  10. ^ Blank R, Barnett AL, Cairney J, Green D, Kirby A, Polatajko H, et al. (March 2019). "International clinical practice recommendations on the definition, diagnosis, assessment, intervention, and psychosocial aspects of developmental coordination disorder". Developmental Medicine and Child Neurology. 61 (3): 242–285. doi:10.1111/dmcn.14132. PMC 6850610. PMID 30671947.
  11. ^ a b c d "What is Dysgraphia?". National Center for Learning Disabilities. December 9, 2010. Archived from the original on August 7, 2012.
  12. ^ Tal-Saban M, Weintraub N (November 2019). "Motor functions of higher education students with dysgraphia". Research in Developmental Disabilities. 94: 103479. doi:10.1016/j.ridd.2019.103479. PMID 31518720. S2CID 202572002.
  13. ^ a b c d e f g h i j k l m Berninger VW, May MO (2011). "Evidence-based diagnosis and treatment for specific learning disabilities involving impairments in written and/or oral language". Journal of Learning Disabilities. 44 (2): 167–83. doi:10.1177/0022219410391189. PMID 21383108. S2CID 44786460.
  14. ^ Mayes, Susan D.; Breaux, Rosanna P.; Calhoun, Susan L.; Frye, Sara S. (2019-06-01). "High Prevalence of Dysgraphia in Elementary Through High School Students With ADHD and Autism". Journal of Attention Disorders. 23 (8): 787–796. doi:10.1177/1087054717720721. ISSN 1087-0547. PMID 28741400. S2CID 442702.
  15. ^ a b c d e Dimauro, G.; Bevilacqua, V.; Colizzi, L.; Pierro, D. Di (2020). "TestGraphia, a Software System for the Early Diagnosis of Dysgraphia". IEEE Access. 8: 19564–19575. Bibcode:2020IEEEA...819564D. doi:10.1109/ACCESS.2020.2968367. ISSN 2169-3536.
  16. ^ a b c d e f g h Chung, Peter J.; Patel, Dilip R.; Nizami, Iman (February 2020). "Disorder of written expression and dysgraphia: definition, diagnosis, and management". Translational Pediatrics. 9 (Suppl 1): S46–S54. doi:10.21037/tp.2019.11.01. ISSN 2224-4336. PMC 7082241. PMID 32206583.
  17. ^ a b c d Deuel RK (January 1995). "Developmental dysgraphia and motor skills disorders". Journal of Child Neurology. 10 (Suppl 1): S6-8. doi:10.1177/08830738950100S103. PMID 7538525. S2CID 1665903.
  18. ^ Chung, Peter J.; Patel, Dilip R.; Nizami, Iman (February 2020). "Disorder of written expression and dysgraphia: definition, diagnosis, and management". Translational Pediatrics. 9 (Suppl 1): S46–S54. doi:10.21037/tp.2019.11.01. ISSN 2224-4336. PMC 7082241. PMID 32206583.
  19. ^ a b Richard, Gilles; Serrurier, Mathieu (2020-04-15). "Dyslexia and Dysgraphia prediction: A new machine learning approach". arXiv:2005.06401 [cs.OH].
  20. ^ Asselborn T, Chapatte M, Dillenbourg P (February 2020). "Extending the Spectrum of Dysgraphia: A Data Driven Strategy to Estimate Handwriting Quality". Scientific Reports. 10 (1): 3140. Bibcode:2020NatSR..10.3140A. doi:10.1038/s41598-020-60011-8. PMC 7035284. PMID 32081940.
  21. ^ Rapcsak SZ, Beeson PM, Henry ML, Leyden A, Kim E, Rising K, et al. (May 2009). "Phonological dyslexia and dysgraphia: cognitive mechanisms and neural substrates". Cortex; A Journal Devoted to the Study of the Nervous System and Behavior. 45 (5): 575–91. doi:10.1016/j.cortex.2008.04.006. PMC 2689874. PMID 18625494.
  22. ^ Faust M (2012-02-13). The Handbook of the Neuropsychology of Language. Wiley - Blackwell. p. 912. ISBN 9781444330403. Retrieved 16 February 2016.
  23. ^ a b c "What Is Dysgraphia?". ADDitude. 2017-02-15. Retrieved 2021-04-20.
  24. ^ a b Asselborn T, Gargot T, Kidziński Ł, Johal W, Cohen D, Jolly C, Dillenbourg P (August 31, 2018). "Automated human-level diagnosis of dysgraphia using a consumer tablet". npj Digital Medicine. 1 (1): 42. doi:10.1038/s41746-018-0049-x. PMC 6550155. PMID 31304322. S2CID 52244820.
  25. ^ Biotteau, Maëlle; Danna, Jérémy; Baudou, Éloïse; Puyjarinet, Frédéric; Velay, Jean-Luc; Albaret, Jean-Michel; Chaix, Yves (2019-07-08). "Developmental coordination disorder and dysgraphia: signs and symptoms, diagnosis, and rehabilitation". Neuropsychiatric Disease and Treatment. 15: 1873–1885. doi:10.2147/NDT.S120514. ISSN 1176-6328. PMC 6626900. PMID 31371960.
  26. ^ Gargot T, Asselborn T, Pellerin H, Zammouri I, M Anzalone S, Casteran L, et al. (2020-09-11). "Acquisition of handwriting in children with and without dysgraphia: A computational approach". PLOS ONE. 15 (9): e0237575. Bibcode:2020PLoSO..1537575G. doi:10.1371/journal.pone.0237575. PMC 7485885. PMID 32915793.
  27. ^ Miceli G, Silveri MC, Caramazza A (July 1985). "Cognitive analysis of a case of pure dysgraphia". Brain and Language. 25 (2): 187–212. doi:10.1016/0093-934X(85)90080-X. PMID 4063789. S2CID 16855570.
  28. ^ Kariyawasam, R.; Nadeeshani, M.; Hamid, T.; Subasinghe, I.; Samarasinghe, P.; Ratnayake, P. (December 2019). "Pubudu: Deep Learning Based Screening and Intervention of Dyslexia, Dysgraphia and Dyscalculia". 2019 14th Conference on Industrial and Information Systems (ICIIS). pp. 476–481. doi:10.1109/ICIIS47346.2019.9063301. ISBN 978-1-7281-3706-3. S2CID 215799660.
  29. ^ Barbetta, Patricia M; Spears-Bunton, Linda A (March 2007). "Learning to Write: Technology for Students with Disabilities in Secondary Inclusive Classrooms". The English Journal. 96 (4): 86–93. doi:10.2307/30047171. JSTOR 30047171.

Further reading

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Look up dysgraphia in Wiktionary, the free dictionary.
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