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Journal Article Intellectual Changes in Aged Twins Get access Lissy Feingold Jarvik, Ph.D., M.D., Lissy Feingold Jarvik, Ph.D., M.D. Department of Medical Genetics, New York State Psychiatric Institute, Columbia UniversityNew YorkGrateful acknowledgment is hereby made of the financial assistance received from the Rockefeller Foundation (1945–1951) and the Division of Research Grants of the National Institutes of Health (1952–1959). Search for other works by this author on: Oxford Academic PubMed Google Scholar Franz J. Kallmann, M.D., Franz J. Kallmann, M.D. Department of Medical Genetics, New York State Psychiatric Institute, Columbia UniversityNew YorkGrateful acknowledgment is hereby made of the financial assistance received from the Rockefeller Foundation (1945–1951) and the Division of Research Grants of the National Institutes of Health (1952–1959). Search for other works by this author on: Oxford Academic PubMed Google Scholar Arthur Falek, Ph.D. Arthur Falek, Ph.D. Department of Medical Genetics, New York State Psychiatric Institute, Columbia UniversityNew YorkGrateful acknowledgment is hereby made of the financial assistance received from the Rockefeller Foundation (1945–1951) and the Division of Research Grants of the National Institutes of Health (1952–1959). Search for other works by this author on: Oxford Academic PubMed Google Scholar Journal of Gerontology, Volume 17, Issue 3, July 1962, Pages 289–294, https://doi.org/10.1093/geronj/17.3.289 Published: 01 July 1962
Jarvik et al. (Sun,) studied this question.