- Male college students, followed 3 years, Harvard University, USA, 1957-60
- N = 17
- Non Response:
- 37%: 9 dropouts, incomplete; about the same happiness distribution.
Mood diary kept 30 days and repeated interviews and tests during three years.
- Authors's label
- Normal introversion
- Our Classification
- Fusion factor indicative of social withdrawal or disturbed introversion (with shy, seclusive, submissive, guil- ty, depressed, masochistic personali- ties) vs social participation or normal extraversion (with poised, sociable,
dominant, confident and spontaneous personalities).
(Fusion Factor A fromt he MMPI Scales: see Kassebaum et al., 1959).
Observed Relation with Happiness
Data were not fully presented.