Encyclopedia of Child Behavior and Development

2011 Edition
| Editors: Sam Goldstein, Jack A. Naglieri

Profound Mental Retardation

Reference work entry
DOI: https://doi.org/10.1007/978-0-387-79061-9_2262



Profound Mental Retardation (MR) is defined by the presence of significantly sub average general intellectual functioning as well as significant limitations in adaptive functioning present prior to the age of 18 years. Individuals with a diagnosis of Severe MR generally obtain IQ scores below 20–25 [1, 3, 4].


Profound MR is described by Diagnostic and statistical manual, 4th Ed.-text Revision (2000) as impairment comparable to a range of IQ scores that fall below 20–25 [2]. Individuals with Severe MR are severely limited in the areas of intellectual functioning and adaptive skills, typically exhibiting extensive deficits in sensorimotor skills during early childhood. They are also likely to experience severe deficits or lack of functioning in the areas of self-care, home living, social skills, community use, self-direction, health and...

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    American Association on Mental Retardation. (2004). Fact sheet: frequently asked about mental retardation. http://www.aamr.org/Policies/faq_mental_retardation.shtml
  2. 2.
    American Psychological Association. (2000). Diagnostic and statistical manual of mental disorders (4-text revision). Washington, DC: American Psychological Association.Google Scholar
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    Goldstein, S., & Reynolds, C. R. (Eds.). (1999). Handbook of neurodevelopmental and genetic disorders in children. New York: The Guilford Press.Google Scholar
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    Mash, E. J., & Barkley, R. A. (Eds.). (2003). Child psychopathology (2nd ed.). New York: The Guilford Press.Google Scholar
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    McLaughlin, P. J., & Wehman, P. (Eds.). (1996). Mental retardation and developmental disabilities (2nd ed.). Austin, TX: Pro-Ed.Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Clinical Psychology ProgramArgosy UniversityAtlantaUSA