No Two Alike: Human Nature and Human Individuality by Judith Rich Harris (Hardcover, W.W.Norton, 2006) ..... Harris argues that three brain systems contribute to making each individual unique: a socialization system figures out how to conform to (mirror) your group. A relationship system figures out how to get along with each different person. A status system figures out how to compete. These adaptable and plastic mental systems we all share also make each of us uniquely different from each other. They generate different behaviors in different contexts (home, school, work, etc.) in which our relationships and status are different.