Correlate as named by investigatorPeople investigatedFinding
35-85 aged white males (largely veterans), USA, 1976
50+ aged, whites, Durham, North Carolina, USA, 197?
Energy and vitality
Gifted women (IQ >135), followed 50 years, California, USA, 1921-72
Students, University of Illinois, USA, 200?
Excitable; energetic; talkative;restless
Mothers, followed from age 30 to 70, Berkeley USA, 1928-68