| Developmental dyspraxia | |
|---|---|
| Classification and external resources | |
| ICD-10 | F82 |
| ICD-9 | 315.4 |
| MeSH | D001072 |
Developmental dyspraxia is a chronic Neurological disorder beginning in childhood that can affect planning of movements and co-ordination as a result of brain messages not being accurately transmitted to the body.[1][2][3][4] It may be diagnosed in the absence of other motor or sensory impairments like[5] cerebral palsy,[6] muscular dystrophy, multiple sclerosis or Parkinson's disease.
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Dyspraxia is a specific learning difficulty (SpLD) so it does not affect overall intelligence or ability, but just affects particular aspects of development. The concept of developmental dyspraxia has existed for more than a century, but differing interpretations of the terminology remain.[7][8][9]
The Dyspraxia Foundation defines developmental dyspraxia as "an impairment or immaturity of the organisation of movement. It is an immaturity in the way that the brain processes information, which results in messages not being properly or fully transmitted. The word 'dyspraxia' comes from the Greek words 'dys', meaning impaired or abnormal, and 'praxis', meaning action or deed.
Dyspraxia affects the planning of what to do and how to do it. It is associated with problems of perception, language and thought".[10] Dyspraxia is described as having two main elements:
Ripley, Daines, and Barrett state that "Developmental dyspraxia is difficulty getting our bodies to do what we want when we want them to do it",[11] and that this difficulty can be considered significant when it interferes with the normal range of activities expected for a child of their age.
Developmental dyspraxia (referred to as developmental coordination disorder (DCD)[7][8][12] in the US and Europe) is a life-long Neurological condition that is more common in males than in females, with a ratio of approximately four males to every female. The exact proportion of people with the disorder is unknown since the disorder can be difficult to detect due to a lack of specific laboratory tests, thus making diagnosis of the condition one of elimination of all other possible causes/diseases. Current estimates range from 5%–20% with 5–6% being the most frequently quoted percentage in the literature. Some estimates show that up to 1 in 30 children may have dyspraxia.[13]
Assessments for dyspraxia typically require a developmental history, detailing ages at which significant developmental milestones, such as crawling and walking, occurred. Motor skills screening includes activities designed to indicate dyspraxia, including balancing, physical sequencing, touch sensitivity, and variations on walking activities. A baseline motor assessment establishes the starting point for developmental intervention programs. Comparing children to normal rates of development may help to establish areas of significant difficulty.
However, research in the British Journal of Special Education has shown that knowledge is severely limited in many who should be trained to recognise and respond to various difficulties, including Developmental Coordination Disorder, Dyslexia and DAMP. The earlier that difficulties are noted and timely assessments occur, the quicker intervention can begin. A teacher or GP could miss a diagnosis if they are only applying a cursory knowledge.
"Teachers will not be able to recognise or accommodate the child with learning difficulties in class if their knowledge is limited. Similarly GPs will find it difficult to detect and appropriately refer children with learning difficulties."[14]
Various areas of development can be affected by developmental dyspraxia and these will persist into adulthood, as dyspraxia has no cure. Often various coping strategies are developed, and these can be enhanced through occupational therapy, physiotherapy, speech therapy, or psychological training.
Developmental verbal dyspraxia is a type of ideational dyspraxia, causing linguistic or phonological impairment. This is the favoured term in the UK; however it is also sometimes referred to as articulatory dyspraxia and in the United States the usual term is childhood apraxia of speech (CAS).[15] Key problems include:
Difficulties with fine motor co-ordination lead to problems with handwriting, which may be due to either ideational or ideo-motor difficulties. Problems associated with this area may include:
Fine-motor problems can also cause difficulty with a wide variety of other tasks such as using a knife and fork, fastening buttons and shoelaces, cooking, brushing one's teeth, applying cosmetics, styling one's hair, opening jars and packets, locking and unlocking doors, shaving and doing housework.[16]
Issues with gross motor coordination mean that major developmental targets including walking, running, climbing and jumping can be affected. The difficulties vary from child to child and can include the following:
In addition to the physical impairments, dyspraxia is associated with problems with memory, especially short-term memory.[16][19][20][21][22] This typically results in difficulty remembering instructions, difficulty organizing one's time and remembering deadlines, increased propensity to lose things or problems carrying out tasks which require remembering several steps in sequence (such as cooking.) Whilst most of the general population experience these problems to some extent, they have a much more significant impact on the lives of dyspraxic people.[21] However, many dyspraxics have excellent long-term memories, despite poor short-term memory.[21] Many dyspraxics benefit from working in a structured environment,[23] as repeating the same routine minimises difficulty with time-management and allows them to commit procedures to long-term memory.
People with dyspraxia may have sensory processing disorder, including abnormal oversensitivity or undersensitivity to physical stimuli, such as touch, light, and sound.[18] This may manifest itself as an inability to tolerate certain textures such as sandpaper or certain fabrics and including oral toleration of excessively textured food (commonly known as picky eating), or even being touched by another individual (in the case of touch oversensitivity) or may require the consistent use of sunglasses outdoors since sunlight may be intense enough to cause discomfort to a dyspraxic (in the case of light oversensitivity). An aversion to loud music and naturally loud environments (such as clubs and bars) is typical behavior of a dyspraxic individual who suffers from auditory oversensitivity, while only being comfortable in unusually warm or cold environments is typical of a dyspraxic with temperature oversensitivity. Undersensitivity to stimuli may also cause problems. Dyspraxics who are undersensitive to pain may injure themselves without realising.[18] Some dyspraxics may be oversensitive to some stimuli and undersensitive to others.[18] These are commonly associated with autism spectrum conditions.
People with dyspraxia sometimes have difficulty moderating the amount of sensory information that their body is constantly sending them, so as a result these people are prone to panic attacks.[21] Having other autistic traits (which is common with dyspraxia and related conditions)[20] may also contribute to sensory-induced panic attacks.
Dyspraxia can cause problems with perception of distance, and with the speed of moving objects and people[18] This can cause problems moving in crowded places and crossing roads and can make learning to drive a car extremely difficult or impossible.
Many dyspraxics struggle to distinguish left from right, even as adults, and have extremely poor sense of direction generally.[16][24]
Moderate to extreme difficulty doing physical tasks is experienced by some dyspraxics, and fatigue is common because so much extra energy is expended while trying to execute physical movements correctly.[25] Some (but not all) dyspraxics suffer from hypotonia, which in this case is chronically low muscle tone caused by dyspraxia.[26][27] People with this condition can have very low muscle strength and endurance (even in comparison with other dyspraxics) and even the simplest physical activities may quickly cause soreness and fatigue, depending on the severity of the hypotonia. Hypotonia may worsen a dyspraxic's already poor balance.[28]
Dyspraxics may have other difficulties that are not due to dyspraxia itself but often co-exist with it. This is sometimes referred to as comorbidity.[29] Dyspraxics may have characteristics of dyslexia (difficulty with reading and spelling), dyscalculia (difficulty with mathematics), dysgraphia (an inability to write neatly and/or draw) expressive language disorder (difficulty with verbal expression), ADHD (poor attention span and impulsive behaviour, which up to 50% of dyspraxics may have.), or Asperger syndrome (consisting variously of poor social cognition, a literal understanding of language [making it hard to understand idioms or sarcasm] and rigid, intense interests). However, they are unlikely to have problems in all of these areas. The pattern of difficulty varies widely from person to person, and it is important to understand that a major weakness for one dyspraxic can be a strength or gift for another. For example, while some dyspraxics have difficulty with reading and spelling due to an overlap with dyslexia, or numeracy due to an overlap with dyscalculia, others may have brilliant reading and spelling or mathematical abilities, however many dyspraxics also struggle with maths. Some estimates show that up to 50% of dyspraxics may have ADHD.[30]
Students with Dyspraxia struggle most in visual-spatial memory. When compared to their peers who don’t have motor difficulties, students with dyspraxia are seven times more likely than typically developing students to achieve very poor scores in visual-spatial memory.[31] As a result of this working memory impairment, students with dyspraxia have learning deficits as well.[32]
Some Students with dyspraxia can also have comorbid language impairments (SLI). Research has found that students with dyspraxia and normal language skills still experience learning difficulties despite relative strengths in language. This means that for students with dyspraxia their working memory abilities determine their learning difficulties. Any strength in language that they have is not able to sufficiently support their learning.[33]
Collier first described developmental dyspraxia as 'congenital maladroitness'. A. Jean Ayres referred to it as a disorder of sensory integration in 1972 while in 1975 Dr Sasson Gubbay called it the 'clumsy child syndrome'.[12] It has also been called minimal brain dysfunction although the two latter names are no longer in use. Other names include:
The World Health Organisation currently lists Developmental Dyspraxia as Specific Developmental Disorder of Motor Function.[12]
Living people who have publicly stated they have been diagnosed with dyspraxia include actor Daniel Radcliffe,[34] photographer David Bailey,[35] Florence Welch from Florence and the Machine[36] and actress Hannah McDonnell.[37]
It is difficult to ascertain whether someone now deceased, who was not diagnosed in his/her lifetime, was dyspraxic or not. However, some deceased people suspected to have been dyspraxic include physicist Albert Einstein [38] (although this is subject to some debate, as some have argued that he may have had Asperger's Syndrome[39], and others speculating that he had both of these conditions).
Writers suspected to have had the condition include Emily Bronte,[40] Charlotte Bronte,[40] poet Samuel Taylor Coleridge,[41] G.K. Chesterton, Ernest Hemingway,[40] Jack Kerouac[40] and George Orwell.
Helen Burns, a character from Charlotte Bronte's Jane Eyre, is alleged to have been based on the author's dyspraxic elder sister Maria Bronte.[38][42]
Ross Patrick is alleged to be dyspraxic owing to the semi-autobiographical content of his book Don't Call Me Stupid, which details the life of a dyspraxic teen in education.
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