Last reviewed:
Jul 28th 2023
M.A., LPCC
Over several decades, numerous researchers and scientists have devised tests to try and determine individual personality types. They have determined five main personality traits, known as the big five personality traits.
These traits include conscientiousness, agreeableness, neuroticism, openness, and extraversion. Each of these five traits can be tested for and scored from low-to-high to determine an individual’s personality [1].
The descriptions of low and high scores for each trait reflect the extreme ends of the spectrum. Typically, most people fall somewhere between low and high scores for each trait rather than at either extreme.
While some descriptions of personality may appear negative, it is likely that individuals with these characteristics also hold many positive features. Furthermore, a personality feature that may seem negative, such as rigid thinking or cynicism, may be crucial for certain types of jobs that people on the other end of the spectrum may not be suited for [2].
However, some negative traits can cause people to be at a higher risk of experiencing mental illness or causing harm to others. These traits may be the focus of professional intervention or self-reflection and self-improvement [2][3].
People who score high on the test for conscientiousness are likely to have the following characteristics:
People who score low on the test for conscientiousness are likely to have the following characteristics:
People who score high on the test for agreeableness are likely to have the following characteristics:
People who score low on the test for agreeableness are likely to have the following characteristics:
People who score high on the test for neuroticism are likely to have the following characteristics:
People who score low on the test for neuroticism are likely to have the following characteristics:
People who score high on the test for openness are likely to have the following characteristics:
People who score low on the test for openness are likely to have the following characteristics:
People who score high on the test for extraversion are likely to have the following characteristics:
People who score low on the test for extraversion are likely to have the following characteristics:
For many decades psychologists have researched and investigated patterns of thoughts, behaviors, and emotions in an attempt to determine specific aspects of individual personalities and their links to mental illness, academia, and professionalism [4].
Paul Costa and Robert McCrae developed the Five-Factor Model of personality, often called the Big Five. This model was based on decades of research and theories around defining and distinguishing personality traits [1].
This work is believed to have begun in the 1930s by Gordon Allport and Henry Odbert, who initially listed over 4500 traits [7]. Their list was then collated and grouped by Raymond Cattel in the 1940s, who developed a 16-item list of personality traits [8].
Many psychologists continued to explore these concepts over the following years. This includes Hans Eysenck, who spent several decades researching personality traits. Hans Eysenck went on to develop the PEN Model, which includes psychoticism, extraversion, and neuroticism [9].
His ideas were then expanded upon and developed by Costa and McCrae in the 1980s, who created the NEO Personality Inventory (NEO-PI), which included neuroticism, extraversion, and openness [10].
Many continued to explore the ideas developed by Eysenck and Costa & McCrae, with further discussions and personality theories being proposed, including additional inventories by Eysenck [11].
Costa and McCrae then went on to add agreeableness and conscientiousness to their personality inventory, thus becoming the Five-Factor Model of personality (FFM) [1]. Many psychologists agreed that the FFM was a valid and successful representation of personality, as it has been shown to be a reliable and consistent measurement tool amongst populations across the world [4].
Several factors can influence personality traits, including genetics, environment, personal experiences, and age.
Research indicates that personality traits are largely linked to genetics. Twin studies show that the five traits of this model are between 40-60% inherited. As such, it can be surmised that a parent who scores very high in neuroticism is likely to pass this trait on to their children [12][13].
Similarly, these traits can be learned by children when exposed to behaviors and attitudes from their parents. Using the example of neuroticism, a neurotic parent is likely to display overt behaviors that will influence their child’s experiences and perspectives. This potentially increases the likelihood of the child going on to develop these neurotic traits themselves [12][13].
Typically, life experiences will not entirely alter a person’s personality, but certain occurrences may cause an adjustment in how a person scores in each of the five domains [2].
For example, experiencing a traumatic or life-threatening event could cause a decrease in openness and an increase in neuroticism. This person may become less willing to engage in new activities, be more rigid in their thinking or routines, and become more anxious and worried about the consequences of their actions and the behaviors of others.
Similarly, if someone experiences abuse or bullying, this could cause a decrease in extraversion and agreeableness. They may become more withdrawn, less comfortable in social situations, more suspicious and distrustful of others, and more cynical in how they view the world and others [14].
It is thought that personality remains relatively consistent throughout a person’s lifetime, particularly after reaching adulthood. However, individual characteristics can change somewhat [2].
For example, studies suggest that agreeableness and conscientiousness are likely to increase as a person ages and matures, while extraversion, neuroticism, and openness can decrease [15][16].
Several medical illnesses and injuries could cause a change in personality, including thyroid problems, dementia, urinary tract infections, and traumatic brain injury. Similarly, many mental health conditions can cause a change in personality, such as schizophrenia, bipolar disorder, personality disorders, anxiety, and depression [17].
Illnesses could cause changes in any of the five domains. For example, depression could cause a decrease in conscientiousness, extraversion, and openness. It is common for people with depression to become withdrawn, lose interest in activities and socializing, and lose motivation and functioning in academic or professional areas.
Similarly, certain types of dementia could cause a decrease in agreeableness and conscientiousness and increase neuroticism, as dementia can cause mood swings, irritability, suspiciousness, and impaired functioning and cognition.
Medications and therapy for physical and mental illnesses could also cause changes in personality traits. These interventions can reduce the impact of the illness, thereby reversing any changes that the illness caused [3][17].
Additionally, some medications could cause side effects that impact personality, while some therapies may help reduce negative personality traits, such as neuroticism [13].
Many different personality tests are available online, some of which have been created by psychologists throughout the decades of research into this topic. These tests tend to be of varying reliability, with those not based on scientific research and evidence being the least reliable.
Factors that can influence the reliability of a personality test include [2][4][18]:
The Big Five, or Five-Factor Model, is considered one of the most reliable personality trait tests. It has been tested within many communities and cultures, age groups, and genders, showing consistent and reliable results throughout [4].
Most psychologists and professionals agree that this test is reliable despite some criticism that the test is generic or inaccurate [19]. However, the Five-Factor Model continues to be used to help determine academic and professional choices and clinical decisions while also influencing research and discussions around the topic of personality [4].
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