Brain research explains why we believe stereotypes.
Questions of personality have vexed mankind from the dawn of personhood: can people change? How do others perceive me? What is the difference between normal and pathological behavior? One's personality is so pervasive and all-important that it presents a clinical paradox of sorts: it is hard to assess our own personality, and impossible to overlook that of others.
Sensation-seeking, also called excitement-seeking, is the tendency to pursue sensory pleasure and excitement. It's the trait of people who go after novelty, complexity, and intense sensations, who love experience for its own sake, and who may take risks in the pursuit of such experience.