It says absolutely nothing about the patients' appearance. It says absolutely nothing about the patients' sense of humor. It says very little about their ability to judge their circumstances-common sense. You find many Harvard professors who have IQ's in the 140 and 150 range and have common sense that is very low. These sorts of things make up a person and are something that goes beyond their intellectual constitution.
Mental retardation has borders with many other diseases.
We have patients who have behavioral disturbances who have mental retardation. These are areas in which our understanding is only beginning to arrive where it ought to be. We have ignored to a great extent the behavioral disturbances in our patients with mental retardation. We've ignored to a great extent the degree to which our mentally retarded patients become depressed. This lesson came home to me with a child who had an IQ of 40 and very disturbed behavior.