psy·cho·gen·e·sis 
(sī′kə-jĕnĭ-sĭs)
(sī′kə-jĕnĭ-sĭs)n.
1. The origin and development of psychological processes, personality, or behavior.
2. Development of a disorder or illness resulting from psychological rather than physiological factors.
psy′cho·ge·netic (-jə-nĕtĭk) adj.
psy′cho·ge·neti·cal·ly adv.