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Communication is one of the challenges for children with severe and multiple disabilities due to their impairments (Turnbull et al, 2004). There is about forty percent of unknown causes of severe and multiple disabilities, but prenatal biomedical is the majority known cause of the disabilities.
What Are the Causes of Intellectual Disability? Intellectual disability can be caused by any condition that impairs development of the brain before birth, during birth or in the childhood years. Several hundred causes have been discovered, but in about one-third of the people affected, the cause remains unknown.