Можно сразу статьи на pubmed
Ну этих исследований просто дофига. Можешь сам найти, если действительно интересно.
Можешь начать с "the world's longest-running longitudinal study The Genetic Studies of Genius, today referred to as the Terman Study of the Gifted, was originally started in 1921 by psychologist Lewis Terman. He aimed to investigate how highly intelligent children developed into adulthood. Results were still being compiled into the 2000s."