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A developmental disability is one that prohibits or interferes with normal developmental functioning or growth. Developmental disabilities are attributable to intellectual disability (formerly known as mental retardation), cerebral palsy, epilepsy, autism, or disabling conditions found to be closely related to intellectual disability or to require treatment similar to that required for individuals with intellectual disability. In order to be considered a developmental disability, the disability must originate before eighteen years of age, be likely to continue indefinitely, and constitute a substantial disability for the individual.
A substantial disability is a condition which results in major impairment of cognitive and/or social functioning. Such limitations include receptive and expressive language, learning, self-care, mobility, self-direction, capacity for independent living, and economic self-sufficiency.
The following are descriptions and characterizations of individuals with the aforementioned disabling conditions. However, it should be understood that all persons are individuals and should not be limited by such descriptions. Talents and abilities should be assessed on an individual basis and training, education, and supports should be customized to work with an individual’s strengths and promote continued learning, regardless of the diagnosis or generalized characteristics of the disability. Las Trampas firmly believes that all individuals have the capability to learn and grow as individuals throughout their lifespan.
Intellectual Disability refers to substantial limitation in present functioning. It is characterized by significantly subaverage intellectual functioning, existing concurrently with related limitations in two or more of the following adaptive skill areas: communication, self-care, home living, social skills, community use, self-direction, health and safety, functional academics, leisure or work.
There are four degrees of severity specified, reflecting the level of intellectual impairment which include Mild, Moderate, Severe, and Profound. These classifications are based on a combination of IQ levels and demonstrated functional capabilities. The IQ level classifications are as follows:
Mild Intellectual Disability
IQ level 50-55 to approximately 70
Moderate Intellectual Disability
IQ level 35-40 to 50-55
Severe Intellectual Disability
IQ level 20-25 to 35-40
Profound Intellectual Disability
IQ level below 20 or 25
This group constitutes the largest segment (about 85%) of those with the disorder. As a group, people with this level of Intellectual Disability typically develop social and communications skills during the preschool years (ages 0-5 years), have minimal impairment and sensorimotor areas, and often are not distinguishable from persons without Intellectual Disability until a later age. By their late teens, they can acquire academic skills up to approximately the sixth-grade level. During their adult years, they usually achieve social and vocational skills adequate for minimum self-support, but may need supervision, guidance, and assistance, especially when under unusual social or economic stress. With appropriate supports, individuals with Mild Intellectual Disability can usually live successfully in the community, either independently or in supervised settings.
This group constitutes about 10% of the entire population of people with Intellectual Disability. Most of the individuals with this level of Intellectual Disability acquire communication skills during early childhood years. They rather profit from vocational training and, with moderate supervision, can attend to their personal care. They can also benefit from training in social and occupational skills but are unlikely to progress beyond the second-grade level in academic subjects. They may learn to travel independently in familiar places. During adolescence, their difficulties in recognizing social conventions may interfere with peer relationships. In their adult years, the majority are able to perform unskilled or semiskilled work under supervision in sheltered workshops or in the general workforce. They adapt well to life in the community, usually in supervised settings.
The group with Severe Intellectual Disability constitutes 3% to 4% of individuals with Intellectual Disability. During early childhood years, they acquire little or no communicative speech. During the school-age period, they may learn to talk and can be trained in elementary self-care skills. They profit to only a limited extent from instruction in pre-academic subjects, such as familiarity with the alphabet and simple counting, but can master skills such as learning sight reading of some “survival” words. In their adult years, they may be able to perform simple tasks in closely supervised settings. Most adapt well to life in the community, in group homes, or with their families unless they have an associated handicap that requires specialized nursing or other care.
The group with Profound Intellectual Disability constitutes approximately 1% to 2% of people with Intellectual Disability. Most individuals with this diagnosis have an identified neurological condition that accounts for their Intellectual Disability. During the childhood years they display considerable impairments in sensorimotor functioning. Optimal development may occur in a highly structured environment with constant aid and supervision and an individualized relationship with a caregiver. Motor development and self-care and communication skills may improve if appropriate training is provided. Some can perform simple tasks in closely supervised and sheltered settings.
Early treatment intervention for the movement disorder of Cerebral Palsy may include development of normal postural reactions and postural tone against gravity for support and control of movement; counteracting the development of abnormal postural tone; giving the child, by means of handling and play, functional patterns that later will be used for feeding, dressing, washing, and other self-help activities; and to prevent the development of contractures and deformities.
Ongoing treatment will continue to focus on the aforementioned areas and include physical therapy treatment techniques to address physical aspects of the condition, occupational therapy to address training of activities of daily living, and surgical measures to address physical mobility.
Individuals with Epilepsy may or may not have concurrent conditions such as intellectual disability or other physical limitations. The primary concern is the social stigma attached to the disorder as it has a sudden onset where the individual is engaging in normal activities one minute and is totally nonfunctional the next. The seizure itself is often alien and frightening to observers, and the person experiencing the convulsion is not in control. Unfortunately, all societies desire and respect predictability and regularity.
The Pervasive Developmental Disorders are sometimes observed with a diverse group of other general medical conditions. With most cases of Autistic Disorder, there is an associated diagnosis of Intellectual Disability, which can range from mild to profound.
Each person with an Autism Spectrum Disorder will have her or his own individual pattern of autism which may have an onset at birth or develop later in childhood. Such patterns may include deficits in social or language skills and unusual behaviors. Because the symptoms vary in type and severity among affected individuals and are often a unique combination for each individual, the range can be associated with an unlimited spectrum, thus the term Autism Spectrum Disorder.
Asperger’s Syndrome is the mildest form of Autism and individuals may become obsessively interested in a single object or topic and social skills are markedly impaired. Language is usually not impaired in a diagnosis of Asperger’s Syndrome.
Among the spectrum, a variety of the following symptoms may be present: