When1: 1933
Who: Lionel Sharples Penrose [Penrose, Lionel Sharples]
What: physician
Where: Britain
works\ Biology of Mental Defect [1933]
Detail: He lived 1898 to 1972 and studied mental deficiency and genetics of Down's syndrome and epiloia or tuberous sclerosis. Maternal age increases children's Down's syndrome, but paternal age does not. Subnormality is not qualitatively different than normal intelligence. Mental deficiency has many factors and causes, and people can perform well on some factors. Mental deficiency is more common in parents and relatives of people with IQ 50 or above than it is in parents of people with IQ lower than 50.
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Date Modified: 2022.0224