Abstract
There is a consistent difference of some 15 IQ points between the test means of American black and white citizens, and there has been a fierce debate as to whether this can be best accounted for by black intellectual inferiority or by such environmental factors as prejudice and discrimination. However, even supporters of the environmental hypothesis have neglected to apply it to the population-people with Down's Syndrome - to which it is most clearly applicable, and this failure of imagination indicates the boundaries of discourse in the field of intellectual disability. The complex relationship between racism and prejudice against people with Disability is illustrated by Dr Down's use of the term 'mongolism'. Down's characterisation of people with intellectual impairment as equivalent both to children and to people of different races fits the need for a working explanation of intellectual impairment. The characterisation is none the less worthless, and we need new frames to shape our observations.