All About Personality: Psychology Definition And Examples

By Mary Elizabeth Dean

Updated June 28, 2019


People have been interested in personality since the beginning of time. The ancient Chinese assigned personality traits based on a person's birth year. Those who believe in astrology think that a person's nature is defined by where the planet was in relation to various other celestial objects during the time of birth. Hippocrates thought that personality was based on different body fluids while some Greeks thought personality traits were associated with a specific disease. But what does science say about how our dominant characteristics come to be? Are we born with them or are they developed as we grow?

It turns out; there is a broad area of psychological study wholly devoted to answering this 'nature vs. nurture' question.

Personality: Psychology Definition

Personality is a term that all of us are familiar with but difficult to define. You're probably familiar with phrases like "I love her personality" or even the psychology term "personality disorder." Try to think of a synonym for the word personality. If you're like me, very few things come to mind instantly. This is because personality is a somewhat abstract concept.

Still, when it comes to understanding human behavior, personality psychology, definition and examples are important to grasp. Knowing just how the different parts of a person come together to form a 'whole' can help you advance in many different areas of life.

Personality comes from the Latin word persona, meaning mask. A persona was a stage mask worn by an actor put on to conceal the stage person's actual identity but representing a certain trait of the character.

The American Psychology Association (APA) defines personality (psychology definition) as:

'Individual differences in characteristic patterns of thinking, feeling, and behaving.'

It can also be seen as a set of traits within a person that work in unison to influence their beliefs, motivations, emotions, and even the way they act.

Remember the synonyms we were trying to come up with at the top of this section? Character, makeup, nature, disposition, temperament, and identity all fit the bill.

10 Quick Personality Psychology Facts

  1. Science says that birth order can affect your personality and that only, first, middle and last children often have similar traits.
  2. Being in love can change your personality-reducing neurotic tendencies including worrying and being annoyed.
  3. Our personalities can alter as we get older which people tending to get nicer as they age.
  4. Certain foods are connected to personality disorders.
  5. Optimists might live longer! According to research, thinking positive might lead to a longer life.

Personality: Psychology Theories In History

To truly understand personality, psychology definition experts say that you first must know about the history of personality theories throughout time. Although some may seem silly, each offers a piece of the puzzle that explains the make up our inner and outer personas.

An interesting thing about this study is that what most people believe is true about personality doesn't line up with scientific research. Let's look at a brief history of personality theory.

Galen's Theory (around 2000 BC)

Building on Hippocrates notions, Galen summarized that if your temperament was balanced, you were healthy. If not, then your bodily fluids must be out of whack. These fluids were called "sanguine," "choleric," "melancholy," and "phlegmatic." His description of personality came from the four elements (earth, wind, water, and fire.) This theory was the most commonly accepted for over 1000 years. Although this theory has since been debunked, it is interesting to know that even 2000 years ago, the first scientists were interested in the human psyche. Immanuel Kant would take this theory even further in the 18th century.

Gall's Theory


In the late 1700s, a German physician, Franz Gall developed a skull-based personality theory called phrenology. According to Gall, measuring the distance between bumps on a person's head could reveal brain size and personality info (i.e., how friendly someone is, whether they would probably murder someone.) It was eventually ruled a pseudoscience but was very popular for many years.

Freud And Erikson's Theories

Sigmund Freud developed one of the most well-known personality theories. Freud's psychoanalytic theory outlines a series of stages and internal conflicts that help build a personality. Later on, Erik Erikson used Freud's work to build a similar argument. Although they differ quite a bit, both believe that early childhood events and stages affect personality.

Current Beliefs: Trait Theories

Many researchers today believe that they are five basic personality traits. One psychologist didn't create this theory but based on the research of many. There are even personality tests you can take to help you determine your personality type.

The five categories include:

  1. Openness
  2. Agreeableness
  3. Neuroticism
  4. Extraversion
  5. Conscientiousness

It's essential to recognize that the traits aren't an 'either' or 'thing' but more like a gauge that you can fall on the 'low' or 'high' end of.

People who are high in openness:

  • Like to try new things and tackling new challenges
  • Are very creative and have artistic interests
  • Tend to be both emotional and intellectual
  • Are usually more liberal/progressive

Low levels of openness are marked by a dislike for change and a resistance to new ideas/creative projects.

Those who are very agreeable:

  • Cares about others and helps them when in need
  • Feels empathy and concern, causing them to take a great

Interest in other people

  • Tries to get along with other people and contribute to their happiness

On the opposite end of the spectrum are people who tend to be less helpful but more competitive, selfish, and manipulative.

People with elevated levels of neuroticism:

  • Are quick to experience anxiety
  • Have mood swings
  • Have trouble getting over stressful situations
  • Tend to worry a lot

Those on the lower end of the neuroticism scale are rarely depressed, tend to stay relaxed and emotionally stable.


Those with high levels of extroversion tend to:

  • Enjoy being the center of attention and meeting new people
  • Feels energized around others and prefers being with friends rather than being alone
  • Says things before thinking/very talkative

Those who are not extraverted people pleasers (those on the low end) like to be alone, have difficulty 'making small talk,' and find it tiring to socialize.

Conscientiousness is a trait that describes people who:

  • Like to set goals, structure, and set schedules
  • Have high levels of self-control
  • Value attention to detail and finishing tasks right away
  • Plan and meet deadlines

Messy, 'go-with-the-flow" people tend to be on the low end of the conscientiousness scale as they often procrastinate and avoid schedules.

Those in charge of personality psychology (definition listed above), have found these traits to be:

  1. Universal
  2. Biological

Although these traits can increase/decrease as people age, they are pretty much steady over adulthood.

Current Beliefs: 16 Personalities Theory

One well-known psychology theorist that contributed to the personality psychology definition is Carl Jung. Although I didn't mention his work earlier, Jung gave a good deal to the field of psychology. His work was the basis for the most celebrated personality test of all time: the Myers-Briggs Type Indicator® (MBTI®) instrument.

Created by Isabel Briggs Myers and her mother, Katharine Cook Briggs, the MBTI serves to help people understand themselves and others. The test categorizes people based on their thinking and then assigns them one of 16 four-letter personality types (I.e., ISTJ, ISFJ, ESTJ)

Each one of these acronyms categories the person based on the following:

  • Extroversion (E) or Introversion (I)
  • Sensing (S) or Intuition (N)
  • Thinking (T) or Feeling (F)
  • Judging (J) or Perceiving (P)

The MBTI has proved a solid way of helping people learn more about themselves, their partners, and even determine a career path. Because personalities are set in childhood, this test can also be helpful for teens trying to find their way.

Personality Disorders

Which brings us to an important part of personality: when abnormal development occurs. According to the APA, there are times when mental illness develops and affects a person's thinking and behavior. If we go back to the personality psychology definition, we understand why these types of issues are called 'personality disorders.'

There are ten specific personality disorders treated by mental health professionals. These include:

Cluster A

  • Paranoid Personality Disorder
  • Schizoid Personality Disorder
  • Schizotypal Personality Disorder

Cluster B

  • Antisocial Personality Disorder
  • Borderline Personality Disorder
  • Histrionic Personality Disorder
  • Narcissistic Personality Disorder

Cluster C

  • Avoidant Personality Disorder
  • Dependent Personality Disorder
  • Obsessive-compulsive Personality Disorder

Although each of these disorders varies as far as symptoms and cause, they have one thing in common: they make it difficult to function and have relationships with others. Many develop in childhood and are the result of a combination of genetics, trauma, and abuse.


Personality disorders are considered challenging to treat since personality is difficult to change. However, new therapies such as DBT is showing promising results with certain disorders such as Borderline Personality Disorder. These treatment options work best when partnered with a professional counselor who is trained in helping resolve such abnormal thinking/behaviors patterns.

If you're struggling with parts of your personality or want to know how to develop certain traits, contact BetterHelp to be matched with someone who can help.

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