Mental retardation has different levels. There is Mild intellectual disability; moderate intellectual disability; severe intellectual disability; and Profound intellectual disability.https://www.floridahospital.com/mental-retardation-mr/symptoms-and-signs-mental-retardation
International Sports Federation for Persons with Intellectual Disability was created in 1986.
integration and sexual education in people with intellectual disability
Intellectual disability.
Intellectual Disability...............
Intellectual disability was called mental retardation in former times. A mean of 100 is used for the standardized measure of IQ in the general population. Systems of classifying intellectual disability in the United States use the terms mild, moderate, severe and profound. People with profound ID have an IQ below 20 and cannot live independently. They require supervision and often have congenital syndromes and associated medical conditions.https://www.ncbi.nlm.nih.gov/books/NBK332877/
Foking
MARK RAPLEY has written: 'SOCIAL CONSTRUCTION OF INTELLECTUAL DISABILITY'
Not as a rule. Of course, kids with intellectual disabilities can be psychotics just like average kids or really smart kids.
Physical disabilities affects someone physically often you can see when someone has a physical disabilities. A learning disabilities can't be seen just by looking at the person, it comes out in how they learn, read, write and so on.
Physical disability from birth
There is no indication in the book that Boo Radley has a learning disability. Boo is portrayed as a reclusive character who is misunderstood by the community, but there is no mention of any intellectual impairment or learning disability.