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Developmental disabilities - definitions

Developmental disabilities represent a cluster of disorders that usually become evident during childhood and last through life. These disabilities may affect a person's ability to learn, speak, understand spoken/written language, make decisions, or live independently. People with developmental disabilities experience differing degrees of a few, some, or all of these effects. It is important to understand that impaired cognitive functioning may be a subset of some developmental disabilities, but it is not associated with all.

Developmental disabilities are not diseases and are not "curable". However, a nurturing environment, paired with life experience, learning opportunities and adaptive therapies and technologies can significantly improve a person's functional abilities and independence.

What are the more common developmental disabilities?
The descriptions below are not a comprehensive list of all developmental disabilities. The variation between people with the same disability may be vast. Some people may live with more than one disability including other developmental disabilities, physical disabilities, psychiatric disabilities, or disabilities associated with aging.

Note: A person with a disability is just that, a person. Always put the person first. Every person deserves to be treated with respect and consideration, especially when dealing with issues of abuse and neglect.

Some of the more common developmental disabilities are:
  • A person who has mental retardation has learning and problem-solving difficulties that may limit their ability to communicate clearly and exercise self-care, home living and social and interpersonal skills.
  • A person with autism may have limited social interactions and communication skills and a restricted repertoire of activities and social interests.
  • A person with cerebral palsy may have a reduced ability to control motor function as a result of damage to the section of the brain responsible for that function. This damage often occurs at birth but may not affect an individual's cognitive ability.
  • A person with a brain injury may experience memory loss, communication barriers, and reduced cognitive ability.
  • A person with Prader-Willi Syndrome has a genetic condition which may cause learning disabilities, lack of strength and coordination, short stature, and compulsive behaviors towards food.
  • A person with Down Syndrome has an extra 21st chromosome; Common traits include mental retardation, birth defects, and a set of appearance characteristics.
  • See also Child abuse reporting for children with developmental disabilities. 

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Page updated: September 21, 2007

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