psy·cho·dy·nam·ics 
(sī′kō-dī-nămĭks, -dĭ-)
(sī′kō-dī-nămĭks, -dĭ-)n.
1. (used with a sing. or pl. verb) The interaction of various conscious and unconscious mental or emotional processes, especially as they influence personality, behavior, and attitudes.
2. (used with a sing. verb) The study of personality and behavior in terms of such processes.
psy′cho·dy·namic adj.
psy′cho·dy·nami·cal·ly adv.