A trait is a stable characteristic or "blueprint" that causes specific behavioural patterns.
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While we often talk about personality, psychologists disagree on what exactly constitutes personality.
Personality is then broadly defined as the characteristic patterns of thoughts, feelings, and behaviours that originate within the person and make a person unique. It is what makes you, you.
When psychology developed as a science that was separate from biology and philosophy, they did not know how to describe the human mind and behaviour.
Different schools of psychology emerged that represent major theories within psychology. At first, psychologists identified with only one school of thought, but today, most psychologists draw on ideas and theories from various schools.
According to the original psychoanalyst, Sigmund Freud, our ego is part of our personality that is between the id (our primal, animalistic instincts), our superego (the mature personality formed by the kind of upbringing and social influences in one’s life) and reality.
The ego works based on the reality principle, which strives to satisfy the id's desires in realistic and socially appropriate ways. The reality principle analyses the costs and benefits of an action before deciding to act upon or abandon impulses.