In 1932, the entire population of Scottish 11-year olds (87, 498 children) took an IQ test. Over 60 years later, psychologists Ian Deary and Lawrence Whalley tracked down about 500 of them and gave them the same test to take again. Here are the results: Some things to note here. Firstly, the correlation is pretty […]
Scott Barry Kaufman
Psychologist | Author