Study of Mathematically Precocious Youth
The Study of Mathematically Precocious Youth (SMPY) is a prospective longitudinal survey study of persons (mostly in the United States) identified by scores of 700 or higher on a section of the SAT Reasoning Test before age 13. It is one of the longest-running longitudinal studies of gifted youth.
Source: Wikipedia — Study of Mathematically Precocious Youth (CC BY-SA 4.0)