Human being posses different types of characteristics. Characteristics are different due to their perception and personality. The popular characteristics are shy, aggressive, submissive, lazy ambitious, loyal and timid etc.
There are fundamentally two major theories-classical and modern which deal with personality traits and which are described below.
1. Classical Theory of Personality Trait: This theory is about 2,000 years old and it deals with emotional equilibrium of a people. Emotional equilibrium was then though to be dependent on the appropriate balance among four fluids within the body. Those four fluids are following:
- Sanguine (bold)
- Choleric (yellow bile)
- Melancholic (black bile)
- Phlegmatic (phlegm)
2. Modern Theory: Eysenck modernized the classic biochemical theories. The individual temperaments was described as:
- Exroverion: >> Introversion
- Neuroticism: >> Stability