In studying personality and consciousness, modern scientists use analogies with the animal world
Over the past 25 years, psychologists have discovered that personalities cluster around five core traits, called the Big Five. Each person can be described as having varying levels of agreeableness, conscientiousness, neuroticism, extroversion, and openness to experience. Contrary to popular belief, people are not limited to specific personality types. Typically, no one is completely extroverted or introverted, or a complete neat freak or a total slob. Although a minority may fall at the extreme ends of the trait, most people fall somewhere in the middle.