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Mental retardation is a disability characterized by significant limitations in both intellectual functioning and adaptive behavior. The disability originates in the developmental period before the age of 18. Individuals with mental retardation are a heterogeneous group. There is no single cause of the disability, and areas of strengths and weaknesses can differ widely from individual to individual. Most individuals with this disability have IQs in the higher ranges of mental retardation, and their disability may be initially noticed primarily on academic tasks.

Between 1% and 3% of the total population in the United States has mental retardation. It is difficult to precisely calculate the number because individuals are not routinely screened, preferred terms for the disability may vary among jurisdictions, and states sometimes use different eligibility cutoffs for different purposes (e.g., eligibility for special education purposes may be different from eligibility for subsidized housing). Additionally, some individuals who might meet the criteria for a diagnosis of mental retardation purposefully avoid the diagnosis and stigma by attempting to appear mentally typical in their community and workplaces. Consequently, the number of adults officially reported to have mental retardation is likely lower than the actual number.

It is understandable that many individuals would not want to be identified as having mental retardation because being labeled with this disability exposes people to the discriminatory attitudes of society. Sadly, people perceived to have an intellectual disability are often socially constructed in ways that stigmatize them and limit their opportunities for full participation in schools, communities, and workplaces. There is evidence that societal attitudes toward persons with intellectual disability are changing, but many prejudices and stereotypes associated with this disability remain.

History and Terminology

Societies have always recognized differences in abilities between individuals. Throughout the ages, people have attempted to describe and name these differences. The earliest description of mental retardation was found written on ancient papyri in Thebes (1500 B.C.), but it is likely that people have been attempting to understand and name observed differences in human capabilities since the origins of civilization.

People's views toward and treatment of individuals seen as differing significantly from the norm or as having disabilities have fluctuated across the years depending on particular circumstances within a given society. Religious beliefs, cultural values, and economic conditions are some of the factors that influence a society's view of disability. There is evidence, for example, that some early societies, such as the Egyptians, highly valued children and spent much effort on nurturing and caring for them. This included children with disabilities. Other societies, such as the Greeks and Romans, respected physical prowess and practiced infanticide when children were born with a clearly distinguishable disability.

Perceptions of individuals with disabilities in more recent times have also shown great variation. At certain points in time, such as in the early 19th century, society in general promoted humane treatment for persons with disabilities. During that time, many professionals in Europe and the United States began to develop educational programs for individuals with mental retardation and other disabilities. When it became clear that treatment could not “cure” disability, and the economic status of the United States changed during the latter part of that same century because of the Civil War, attitudes toward persons with disabilities shifted. They became seen as burdens to society, incapable of benefiting from educational programs or contributing to their communities. Large-scale institutions where people with disabilities were segregated and that provided only minimal care became the norm at this point rather than the progressive programs seen earlier. The trend toward institutionalization continued throughout the early part of the 20th century.

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