- Describe personality and the theories about how it develops
- Understand the psychodynamic perspective on personality development
- Describe defense mechanisms
- Describe the psychosexual stages of personality development
- Explain Adler and Erikson’s contributions to personality theory
- Explain Carl Jung’s contributions to personality theory
Defining Personality
personality
Personality refers to the long-standing traits and patterns that propel individuals to consistently think, feel, and behave in specific ways. Our personality is what makes us unique individuals. Each person has a distinctive pattern of enduring, long-term characteristics and a manner in which they interact with other individuals and the world around them.
The word personality comes from the Latin word persona.

Personality encompasses a broad range of factors that influence how people perceive, interpret, and respond to their environment, including their temperament, emotions, motivation, beliefs, values, and attitudes.
Can Personality Change?
Personality is typically seen as relatively stable across time and situations, but can also be influenced by various factors such as culture, social environment, life experiences, and personal growth. Understanding an individual’s personality is important in many areas of psychology, including clinical and counseling psychology, where personality assessment can help diagnose and treat mental health conditions, as well as in social and developmental psychology, where it can shed light on how people form relationships, develop identity, and navigate the world around them.
Most students in a psychology class are eager to learn about personality and personality tests. Are the tests accurate and do they work? Can I change my personality? We’ll dive into those types of things soon, but first, we want to examine the history of personality and how it is studied.

Historical Perspectives
The concept of personality has been studied for thousands of years across various cultures and philosophies.
Ancient Eastern Perspectives
Beginning in the 1st millennium BCE and further developed throughout the 6th and 4th centuries BCE, the Chinese philosophy of Taoism, developed by Laozi and Zhuangzi, emphasized the idea of balance and duality in nature and human life.
- Within Taoist philosophy, the concepts known as Yin and Yang represent complementary forces that create a dynamic balance within all elements of life and existence, including human personalities.
- People were seen as possessing different combinations of Yin, or “soft”, and Yang, or “hard” qualities, which influenced their personality traits and behaviors (Wang & Wang, 2020) [1].
In India, the Bhagavad Gita (5th–2nd century BCE) described three Gunas or fundamental qualities: Sattva (purity, harmony), Rajas (activity, passion), and Tamas (inertia, darkness). A person’s dominant Guna was believed to determine their primary nature—sattvic individuals are calm, rajasic individuals are driven, and tamasic individuals are lethargic (Srivastava, 2012).
The Four Temperaments
In 370 BCE, Hippocrates theorized that personality traits and human behaviors are based on four separate temperaments associated with four fluids (“humors”) of the body (Fazeli, 2012). Centuries later, the influential Greek physician and philosopher Galen built on Hippocrates’s theory, suggesting that both diseases and personality differences could be explained by imbalances in the humors and that each person exhibits one of the four temperaments:
- choleric temperament (yellow bile from the liver); the choleric person is passionate, ambitious, and bold
- melancholic temperament (black bile from the kidneys); the melancholic person is reserved, anxious, and unhappy
- sanguine temperament (red blood from the heart); the sanguine person is joyful, eager, and optimistic
- phlegmatic temperament (white phlegm from the lungs); the phlegmatic person is calm, reliable, and thoughtful (Clark & Watson, 2008; Eysenck & Eysenck, 1985; Lecci & Magnavita, 2013; Noga, 2007).
While we now know the humoral theory is biologically incorrect, this framework influenced personality thinking for centuries. Philosopher Immanuel Kant (18th century) developed trait descriptions for each temperament, and psychologist Wilhelm Wundt (19th century) proposed organizing temperaments along two dimensions: emotional versus nonemotional, and changeable versus unchangeable. These dimensional approaches foreshadowed modern trait theories.

A Historical Misstep: Phrenology

In 1780, Franz Gall, a German physician, proposed that the distances between bumps on the skull reveal a person’s personality traits, character, and mental abilities. Initially, phrenology was very popular; however, it was soon discredited for lack of empirical support (Fancher, 1979)(a) Gall developed a chart that depicted which areas of the skull corresponded to particular personality traits or characteristics (Hothersall, 1995). (b) An 1825 lithograph depicts Gall examining the skull of a young woman. (credit b: modification of work by Wellcome Library, London)
The Rise of Psychological Personality Theories
Sigmund Freud’s psychodynamic theory became the first comprehensive psychological theory of personality, explaining both normal and abnormal behavior. Freud proposed that unconscious drives—particularly those related to sex and aggression—along with early childhood experiences shape personality throughout life.
Freud’s followers, called neo-Freudians, modified his ideas. While they agreed that childhood matters, they placed less emphasis on sexuality and more on social and cultural influences. Theorists like Alfred Adler, Erik Erikson, and Carl Jung each contributed unique perspectives that we will explore in this module.
The psychodynamic perspective dominated the first half of the 20th century, but other major approaches eventually emerged: learning theories, humanistic perspectives, biological and evolutionary theories, trait approaches, and cultural perspectives. In this module, we will examine each of these, beginning with Freud’s foundational ideas.
- How would you describe your own personality? Do you think that friends and family would describe you in much the same way? Why or why not?
- How would you describe your personality in an online dating profile?
- What are some of your positive and negative personality qualities? How do you think these qualities will affect your choice of career?
- Wang, Z. D., & Wang, F. Y. (2020). The Taiji Model of Self II: Developing Self Models and Self-Cultivation Theories Based on the Chinese Cultural Traditions of Taoism and Buddhism. Frontiers in psychology, 11, 540074. https://doi.org/10.3389/fpsyg.2020.540074 ↵