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In this pamphlet the authors give the results of Binet intelligence tests applied to 1,077 children in the Royal Hospital for Sick Children, Glasgow, and of similar tests applied to their brothers and sisters as controls. The report presents the following conclusions:
The children who were suffering from rheumatism, pneumonia, nephritis and other ailments described as non-brain did not differ in intelligence from the healthy members of the population to which they belonged: hence, disease on the whole does not appear to have any appreciable effect on the intelligence.
Those who were suffering from disease of the spinal cord did not differ appreciably in intelligence from their healthy brothers and sisters.
On the whole, it was only in cases in which there was disease of the ductless glands and of the brain that there was appreciable departure from the normal in intelligence.
Localized cerebral disease, e. g., cerebral tumor, was
Intelligence and Disease.. JAMA. 1932;98(18):1589. doi:10.1001/jama.1932.02730440069031