“…He also divided personality into two constitutional groups (temperaments): the 'schizothymic' (with the hyperesthetic-sensitive and the anesthetic-cold characters) and the 'cyclothymic' (with the depressive-melancholic and the hypomanic characters). Eysenck and Eysenck (1962, 1964, 1967, 1968, 1969b, 1972, Eysenck et al ( , 1974Eysenck et al ( , 1976, Gray (1991), Kagan (1992Kagan ( , 1997Kagan ( , 2003Kagan ( , 2005, Kagan et al (1989Kagan et al ( , 1995Kagan et al ( , 2007Kagan et al ( , 2001, Kagan and Zentner (1996) Cloninger et al (1999), Cloninger (1987), Constantino et al (2002) all developed theories of temperament and character traits and dimensions.…”