Disabilities affecting intellectual abilities

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There are a variety of disabilities affecting cognitive ability. This is a broad concept encompassing various intellectual or cognitive deficits, including intellectual disability (formerly called mental retardation), deficits too mild to properly qualify as intellectual disability, various specific conditions (such as specific learning disability), and problems acquired later in life through acquired brain injuries or neurodegenerative diseases like dementia.

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Many of these disabilities have an effect on memory, which is the ability to recall what has been learned over time. Typically memory is moved from sensory memory to working memory, and then finally into long-term memory. People with cognitive disabilities typically will have trouble with one of these types of memory. [1]

Intellectual disability

Intellectual disability, also known as general learning disability, [2] and previously known as mental retardation (a term now considered offensive), [3] [4] is a generalized disorder characterized by significantly impaired cognitive functioning and deficits in two or more adaptive behaviors that appears before adulthood. It has historically been defined as an Intelligence Quotient (IQ) score under 70, but the definition now includes both one component relating to mental functioning and one relating to individuals' functional skills in their environment, so IQ is not the only factor.

Intellectual disability must have appeared in the developmental period, not only as an adult. By contrast, people with cognitive impairment have, or previously had, normal IQ, but now show confusion, forgetfulness and difficulty concentrating; cognitive impairment is typical of brain injuries, side effects from medications, and dementia.

Specific learning disability

A specific learning disability is a classification including several disorders in which a person has difficulty learning in a typical manner, usually caused by an unknown factor or factors, but sometimes caused by stroke or other medical problems. Specific learning disabilities include dyslexia and developmental coordination disorder and other disorders of psychological development. [5] Unlike other intellectual disabilities, it is not indicative of general intelligence level, and many experts consequently do not consider it to be a true intellectual disability. Rather, people with a specific learning disability have trouble performing specific types of cognitive skills or if taught in conventional ways. A specific learning disability cannot be cured or fixed, but the effects can be mitigated by the use of different learning strategies.

Individuals with specific learning disabilities face some challenges throughout life. Social support can be a crucial component for students with specific learning disabilities in the school system. With the right support and intervention, people with specific learning disabilities can succeed in school and be successful later in life. Conversely, many individuals who have struggled at school or who were considered 'lazy' or 'stupid' at school, may have had unrecognised specific learning disability instead of character flaws or low IQ.

Acquired brain injuries

An acquired brain injury (ABI) is brain damage caused by events after birth, rather than as part of a genetic or congenital disorder. It usually affects cognitive, physical, emotional, social or independent functioning. ABIs can result from either a traumatic brain injury or a non-traumatic injury such as stroke, infection or substance abuse. Most definitions of ABI exclude neurodegenerative disorders.

People with a brain injury may have difficulty controlling, coordinating and communicating their thoughts and actions. They may or may not retain their intellectual abilities, depending on the type and extent of the injury. However, the intellectual abilities of a person with a brain injury are likely to be interfered with by the resulting thought coordination and communication difficulties, which can make it difficult for them to express themselves in a manner intelligible to others. This may give the false impression of a damaged intelligence even in people with normal intellectual capacity.

Neurodegenerative diseases

Neurodegenerative diseases all involve the progressive loss of structure or function of neurons, including the death of neurons. Many neurodegenerative diseases including Parkinson's, Alzheimer's, and Huntington's occur as a result of neurodegenerative processes. As research progresses, many similarities appear which relate these diseases to one another on a sub-cellular level. Discovering these similarities offers hope for therapeutic advances that could ameliorate many diseases simultaneously.

Dementia is a serious loss of cognitive ability in a previously unimpaired person, beyond what might be expected from normal aging. Both dementia and intellectual disability are defined by neurologists as having an IQ that is two standard deviations below median (below about 70, when 100 is the median); the difference between these two classifications for intellectual disability is whether the low IQ represents a lifelong condition (intellectual disability), or a condition that is acquired later (dementia). [6]

Dementia may be static, the result of a unique global brain injury, or progressive, resulting in long-term decline due to damage or disease in the body. In the early stages of Alzheimer's disease, whose symptoms of dementia are called mild cognitive impairment , the person typically loses 8 to 10 IQ points per year, with the result that a person of previously normal intelligence usually becomes intellectually disabled in less than five years. [7]

Living with cognitive disability

Research documents the importance of providing those with intellectual disabilities alternative spaces and contexts where they feel included and can assert their own definitions of ability and what it is to be "normal." [8]

Related Research Articles

<span class="mw-page-title-main">Dementia</span> Long-term brain disorders causing impaired memory, thinking and behavior

Dementia is a syndrome associated with many neurodegenerative diseases, characterized by a general decline in cognitive abilities that affects a person's ability to perform everyday activities. This typically involves problems with memory, thinking, behavior, and motor control. Aside from memory impairment and a disruption in thought patterns, the most common symptoms of dementia include emotional problems, difficulties with language, and decreased motivation. The symptoms may be described as occurring in a continuum over several stages. Dementia ultimately has a significant effect on the individual, their caregivers, and their social relationships in general. A diagnosis of dementia requires the observation of a change from a person's usual mental functioning and a greater cognitive decline than might be caused by the normal aging process.

<span class="mw-page-title-main">Dementia with Lewy bodies</span> Type of progressive dementia

Dementia with Lewy bodies (DLB) is a type of dementia characterized by changes in sleep, behavior, cognition, movement, and regulation of automatic bodily functions. Memory loss is not always an early symptom. The disease worsens over time and is usually diagnosed when cognitive impairment interferes with normal daily functioning. Together with Parkinson's disease dementia, DLB is one of the two Lewy body dementias. It is a common form of dementia, but the prevalence is not known accurately and many diagnoses are missed. The disease was first described on autopsy by Kenji Kosaka in 1976, and he named the condition several years later.

<span class="mw-page-title-main">Dysgraphia</span> Neurological disorder of written expression

Dysgraphia is a neurological disorder 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. It often overlaps with other learning disabilities and neurodevelopmental disorders such as speech impairment, attention deficit hyperactivity disorder (ADHD) or developmental coordination disorder (DCD).

Cognitive disorders (CDs), also known as neurocognitive disorders (NCDs), are a category of mental health disorders that primarily affect cognitive abilities including learning, memory, perception, and problem-solving. Neurocognitive disorders include delirium, mild neurocognitive disorders, and major neurocognitive disorder. They are defined by deficits in cognitive ability that are acquired, typically represent decline, and may have an underlying brain pathology. The DSM-5 defines six key domains of cognitive function: executive function, learning and memory, perceptual-motor function, language, complex attention, and social cognition.

The following outline is provided as an overview of and topical guide to autism:

The Wechsler Intelligence Scale for Children (WISC) is an individually administered intelligence test for children between the ages of 6 and 16. The Fifth Edition is the most recent version.

<span class="mw-page-title-main">Acquired brain injury</span> Brain damage caused by events after birth

Acquired brain injury (ABI) is brain damage caused by events after birth, rather than as part of a genetic or congenital disorder such as fetal alcohol syndrome, perinatal illness or perinatal hypoxia. ABI can result in cognitive, physical, emotional, or behavioural impairments that lead to permanent or temporary changes in functioning. These impairments result from either traumatic brain injury or nontraumatic injury derived from either an internal or external source. ABI does not include damage to the brain resulting from neurodegenerative disorders.

A reading disability is a condition in which a person displays difficulty reading. Examples of reading disabilities include: developmental dyslexia, And alexia,

Memory disorders are the result of damage to neuroanatomical structures that hinders the storage, retention and recollection of memories. Memory disorders can be progressive, including Alzheimer's disease, or they can be immediate including disorders resulting from head injury.

<span class="mw-page-title-main">Organic brain syndrome</span> Disorder of mental function whose cause is alleged to be known as physiological

Organic brain syndrome, also known as organic brain disease, organic brain damage, organic brain disorder, organic mental syndrome, or organic mental disorder, refers to any syndrome or disorder of mental function whose cause is alleged to be known as organic (physiologic) rather than purely of the mind. These names are older and nearly obsolete general terms from psychiatry, referring to many physical disorders that cause impaired mental function. They are meant to exclude psychiatric disorders. Originally, the term was created to distinguish physical causes of mental impairment from psychiatric disorders, but during the era when this distinction was drawn, not enough was known about brain science for this cause-based classification to be more than educated guesswork labeled with misplaced certainty, which is why it has been deemphasized in current medicine. While mental or behavioural abnormalities related to the dysfunction can be permanent, treating the disease early may prevent permanent damage in addition to fully restoring mental functions. An organic cause to brain dysfunction is suspected when there is no indication of a clearly defined psychiatric or "inorganic" cause, such as a mood disorder.

Brain training is a program of regular activities purported to maintain or improve one's cognitive abilities. The phrase “cognitive ability” usually refers to components of fluid intelligence such as executive function and working memory. Cognitive training reflects a hypothesis that cognitive abilities can be maintained or improved by exercising the brain, analogous to the way physical fitness is improved by exercising the body. Cognitive training activities can take place in numerous modalities such as cardiovascular fitness training, playing online games or completing cognitive tasks in alignment with a training regimen, playing video games that require visuospatial reasoning, and engaging in novel activities such as dance, art, and music.

Cognitive impairment is an inclusive term to describe any characteristic that acts as a barrier to the cognition process or different areas of cognition. Cognition, also known as cognitive function, refers to the mental processes of how a person gains knowledge, uses existing knowledge, and understands things that are happening around them using their thoughts and senses. A cognitive impairment can be in different domains or aspects of a person's cognitive function including memory, attention span, planning, reasoning, decision-making, language, executive functioning, and visuospatial functioning. The term cognitive impairment covers many different diseases and conditions and may also be symptom or manifestation of a different underlying condition. Examples include impairments in overall intelligence, specific and restricted impairments in cognitive abilities, neuropsychological impairments, or it may describe drug-induced impairment in cognition and memory. Cognitive impairments may be short-term, progressive or permanent.

Alcohol-related dementia (ARD) is a form of dementia caused by long-term, excessive consumption of alcohol, resulting in neurological damage and impaired cognitive function.

<span class="mw-page-title-main">Learning disability</span> Range of neurodevelopmental conditions

Learning disability, learning disorder, or learning difficulty is a condition in the brain that causes difficulties comprehending or processing information and can be caused by several different factors. Given the "difficulty learning in a typical manner", this does not exclude the ability to learn in a different manner. Therefore, some people can be more accurately described as having a "learning difference", thus avoiding any misconception of being disabled with a possible lack of an ability to learn and possible negative stereotyping. In the United Kingdom, the term "learning disability" generally refers to an intellectual disability, while conditions such as dyslexia and dyspraxia are usually referred to as "learning difficulties".

<span class="mw-page-title-main">Intellectual disability</span> Generalized neurodevelopmental disorder

Intellectual disability (ID), also known as general learning disability and formerly mental retardation, is a generalized neurodevelopmental disorder characterized by significant impairment in intellectual and adaptive functioning that is first apparent during childhood. Children with intellectual disabilities typically have an intelligence quotient (IQ) below 70 and deficits in at least two adaptive behaviors that affect everyday, general living. According to the DSM-5, intellectual functions include reasoning, problem solving, planning, abstract thinking, judgment, academic learning, and learning from experience. Deficits in these functions must be confirmed by clinical evaluation and individualized standard IQ testing. On the other hand, adaptive behaviors include the social, developmental, and practical skills people learn to perform tasks in their everyday lives. Deficits in adaptive functioning often compromises an individual's independence and ability to meet their social responsibility.

Borderline intellectual functioning, previously called borderline mental retardation, is a categorization of intelligence wherein a person has below average cognitive ability, but the deficit is not as severe as intellectual disability. It is sometimes called below average IQ (BAIQ). This is technically a cognitive impairment; however, this group may not be sufficiently mentally disabled to be eligible for specialized services.

In psychology and neuroscience, executive dysfunction, or executive function deficit, is a disruption to the efficacy of the executive functions, which is a group of cognitive processes that regulate, control, and manage other cognitive processes. Executive dysfunction can refer to both neurocognitive deficits and behavioural symptoms. It is implicated in numerous psychopathologies and mental disorders, as well as short-term and long-term changes in non-clinical executive control. Executive dysfunction is the mechanism underlying ADHD paralysis, and in a broader context, it can encompass other cognitive difficulties like planning, organizing, initiating tasks and regulating emotions. It is a core characteristic of ADHD and can elucidate numerous other recognized symptoms.

Mental disorders diagnosed in childhood can be neurodevelopmental, emotional, or behavioral disorders. These disorders negatively impact the mental and social wellbeing of a child, and children with these disorders require support from their families and schools. Childhood mental disorders often persist into adulthood. These disorders are usually first diagnosed in infancy, childhood, or adolescence, as laid out in the DSM-5 and in the ICD-11.

<span class="mw-page-title-main">Childhood acquired brain injury</span> Medical condition

Childhood acquired brain injury (ABI) is the term given to any injury to the brain that occurs during childhood but after birth and the immediate neonatal period. It excludes injuries sustained as a result of genetic or congenital disorder. It also excludes those resulting from birth traumas such as hypoxia or conditions such as foetal alcohol syndrome. It encompasses both traumatic and non-traumatic injuries.

The following outline is provided as an overview of and topical guide to the human brain:

References

  1. ↑ "Inclusive Education". Teachers Without Borders Resources. PBworks. Archived from the original (Wiki) on 22 July 2017. Retrieved 24 October 2017.
  2. ↑ Special Education Support Service General Learning Disabilities Ireland Archived copy
  3. ↑ Kaufman, Alan S. (2009). IQ Testing 101 . New York: Springer Publishing. pp.  114–115. ISBN   978-0-8261-0629-2.
  4. ↑ Plomin, Robert; DeFries, John C.; Knopik, Valerie S.; Neiderhiser, Jenae M. (2012). Behavioral Genetics. Shaun Purcell (Appendix: Statistical Methods in Behavioral Genetics). Worth Publishers. p. 163. eISSN   1573-3297. ISBN   978-1-4292-4215-8. ISSN   0001-8244. However, the term mental retardation is now considered pejorative,
  5. ↑ "International Statistical Classification of Diseases and Related Health Problems 10th Revision (ICD-10) Version for 2010". World Health Organization. Retrieved 12 March 2013.
  6. ↑ Davis, Larry E.; Schultz, Jessica L.; King, Molly K. (2005). Fundamentals of Neurologic Disease . Demos Medical Publishing. pp.  115. ISBN   1-888799-84-6. OCLC   57316700.
  7. ↑ Dalton, A. J.; Janicki, Matthew P. (1999). Dementia, aging, and intellectual disabilities: a handbook. Philadelphia, PA: Brunner/Mazel. p. 12. ISBN   0-87630-916-3. OCLC   39223703.
  8. ↑ Adkins, B.; Summerville, J.; Knox, M.; Brown, A. R.; Dillon, S. (2012). "Digital technologies and musical participation for people with intellectual disabilities" (PDF). New Media & Society. 15 (4): 501–518. doi:10.1177/1461444812457338. hdl: 10072/47764 . OCLC   829241491. S2CID   174536.
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