A person's temperament is formed as an infant and never changes. It simply develops over time as you mature and grow, to make you who you are. Studies have shown that temperament does not change but remains constant. THERE ARE FOUR MAIN TYPES OF TEMPERAMENTS TEMPERAMENT TYPES Sanguine (enthusiastic, active, and social) Choleric (short-tempered, fast, and irritable) Melancholic (analytical, wise, and quiet) Phlegmatic (relaxed and peaceful). Psychologists recognize four primary temperament types. The names of the types were originally names of humor in more distant times . It was believed that humor caused people to behave in certain ways. Although science has refuted the existence of humor in that fashion, the names of the four temperament types stuck. It is possible, in fact likely, that someone will have both primary and secondary temperament types. A person can have any combination of the temperament types to make up their overall personality. Th