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Personality: the story on HearLore | HearLore
Personality
The very first word of this story is Personality, yet for most of human history, the concept did not exist as we understand it today. Before the Renaissance, a person was not defined by an internal self but by their place in a network of social roles, such as the household, the kinship network, the guild, and the corporation. It was only during the recovery of Lucretius' poem De rerum natura in the year 1417 that the seeds of a modern understanding of the world began to take root. This shift marked the transition from a collective identity to an individual one, where the characteristic mark of the modern man became twofold: an internal world of attitudes, values, and feelings, and an external world of environmental interaction. The medieval view held that the individual alone was nothing, dependent entirely on the family, whereas the modern man is largely influenced by urbanization, education, mass communication, industrialization, and politicization. This historical pivot created the canvas upon which the complex study of personality would eventually be painted, transforming the question from who one is in relation to others to who one is in relation to oneself.
The Five Pillars of Character
In the modern era, the most robust framework for understanding human differences is the Big Five model, often memorized by the acronym OCEAN. This model identifies five core factors: openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism. These components are generally stable over time, yet they are not immutable, as about half of the variance in these traits appears to be attributable to a person's genetics rather than the effects of one's environment. Each of the five factors is composed of two aspects and many facets, such as openness splitting into experiencing and intellect, which further divide into facets like fantasy and ideas. These factors also show correlations with each other that suggest higher order meta-traits, such as factor beta, which combines openness and extraversion to form a meta-trait associated with mental and physical exploration. While thousands of measures exist to assess specific facets, the Big Five remains the approach with the most support in the field, validated across 56 nations and 28 languages. The consistency of these findings suggests that the underlying factors are common across cultures, even if language limitations and cultural nuances create differences in how traits are expressed or described.
The Biological Blueprint of Behavior
The biological basis of personality posits that anatomical structures such as genes, hormones, and brain areas underlie individual differences in behavior. Neuropsychology studies how the structure of the brain relates to various psychological processes, revealing that the frontal lobes are responsible for foresight and anticipation, while the occipital lobes process visual information. Hormonal influences play a critical role, with testosterone being important for sociability, affectivity, aggressiveness, and sexuality. Research indicates that the expression of a personality trait depends on the volume of the brain cortex it is associated with. Specific temperaments have been linked to distinct biological markers; for instance, harm avoidance is associated with increased reactivity in insular and amygdala salience networks, as well as reduced 5-HT2 receptor binding peripherally. Novelty seeking correlates with dopamine synthesis capacity in the striatum and reduced auto receptor availability in the midbrain. Reward dependence has been linked with the oxytocin system, showing increased concentration of plasma oxytocin and increased volume in oxytocin-related regions of the hypothalamus. Persistence is associated with increased striatal-mPFC connectivity and increased salivary amylase levels indicative of increased noradrenergic tone. These biological findings suggest that personality is not merely a social construct but is deeply rooted in the physical machinery of the human body.
Common questions
When did the concept of personality begin to take root in human history?
The seeds of a modern understanding of personality began to take root in the year 1417 with the recovery of Lucretius' poem De rerum natura. This event marked the transition from a collective identity to an individual one where the characteristic mark of the modern man became twofold. The shift created the canvas upon which the complex study of personality would eventually be painted.
What are the five core factors of the Big Five personality model?
The Big Five model identifies five core factors as openness to experience, conscientiousness, extraversion, agreeableness, and neuroticism. These components are generally stable over time yet about half of the variance in these traits appears to be attributable to a person's genetics rather than the effects of one's environment. The model remains the approach with the most support in the field validated across 56 nations and 28 languages.
Which brain structures and hormones influence personality traits?
Anatomical structures such as genes hormones and brain areas underlie individual differences in behavior. The frontal lobes are responsible for foresight and anticipation while the occipital lobes process visual information. Hormonal influences play a critical role with testosterone being important for sociability affectivity aggressiveness and sexuality.
How does acting against one's nature affect happiness according to personality research?
Studies have revealed that introverts acting extraverted experience an increase in positive affect while extraverts acting introverted suffer from ego depletion. Ego depletion occurs when people divert most if not all of their cognitive energy toward regulating a foreign style of behavior and attitudes. This results in an inability to use any energy to make important or difficult decisions plan for the future control or regulate emotions or perform effectively on other cognitive tasks.
What role do early attachment styles play in personality development?
Mary Ainsworth's strange situation experiment showcased how babies reacted to having their mother leave them alone in a room with a stranger resulting in attachment styles labeled as secure ambivalent avoidant and disorganized. Children who were securely attached tend to be more trusting sociable and confident in their day-to-day life whereas those who were disorganized were reported to have higher levels of anxiety anger and risk-taking behavior. Identical twins have similar personalities largely because they share the same genetic makeup rather than their shared environment.
How does culture influence the expression of personality traits?
Cross-cultural assessment depends on the universality of personality traits which is whether there are common traits among humans regardless of culture or other factors. Western cultures value individualism independence and assertiveness reflected in traits such as extraversion while Eastern cultures value collectivism cooperation and social harmony reflected in traits such as agreeableness. The Five-Factor Model has shown clear cross-cultural applicability with results from administering the NEO-PI-R to 7,134 people across six languages showing a similar pattern of the same five underlying constructs found in the American factor structure.
A counterintuitive finding in personality research challenges the assumption that acting in accordance with one's nature is always the path to happiness. Studies have investigated the effects of introverts acting extraverted and extraverts acting introverted, revealing that the former experience an increase in positive affect while the latter suffer from a phenomenon known as ego depletion. Ego depletion, or cognitive fatigue, occurs when people divert most, if not all, of their cognitive energy toward regulating a foreign style of behavior and attitudes. Because all available energy is being used to maintain this contrary behavior, the result is an inability to use any energy to make important or difficult decisions, plan for the future, control or regulate emotions, or perform effectively on other cognitive tasks. This suggests that while extraverts tend to be happier than introverts, the mechanism is not solely due to the situations they choose, as instrumental theories suggest, but rather a temperamental disposition that leads them to experience a higher degree of positive affect. The research by Lucas and Baird found no statistically significant support for the instrumental theory but did confirm that extraverts generally experience a higher level of positive affect, mediated by factors such as self-esteem and self-efficacy.
The Roots of Attachment and Change
The development of personality is heavily influenced by early environmental factors, particularly the styles of attachment formed in infancy. Mary Ainsworth's strange situation experiment showcased how babies reacted to having their mother leave them alone in a room with a stranger, resulting in attachment styles labeled as secure, ambivalent, avoidant, and disorganized. Children who were securely attached tend to be more trusting, sociable, and confident in their day-to-day life, whereas those who were disorganized were reported to have higher levels of anxiety, anger, and risk-taking behavior. However, the influence of the home environment is not absolute; Judith Rich Harris's group socialization theory postulates that an individual's peer groups, rather than parental figures, are the primary influence of personality and behavior in adulthood. Intra- and intergroup processes, not dyadic relationships such as parent-child relationships, are responsible for the transmission of culture and for environmental modification of children's personality characteristics. Identical twins have similar personalities largely because they share the same genetic makeup rather than their shared environment, suggesting that the accumulation of small daily experiences may work for personality development in ways that vary by individual susceptibility to experiences, like attachment security.
The Philosophical Temperament of Thought
William James, the father of American psychology, argued that temperament explains a great deal of the controversies in the history of philosophy by serving as a very influential premise in the arguments of philosophers. He posited that despite seeking only impersonal reasons for their conclusions, the temperament of philosophers influenced their philosophy, creating a bias that is tantamount to a personality trait. In his 1907 lectures on Pragmatism, James fashioned a sort of trait theory of the empiricist and rationalist camps of philosophy, describing the mental make-up of rationalist philosophers as tender-minded and going by principles, while that of empiricist philosophers is described as tough-minded and going by facts. This distinction was not merely academic; it reflected a fundamental divide in how individuals perceive reality. Rationalism leads to the creation of closed systems and is regarded as pretension by the fact-loving mind, whereas empiricists stick with the external senses rather than logic. John Locke's explanation of personal identity, for instance, defines identity on the basis of consciousness, which always accompanies thinking and remains constant in different places at different times. This philosophical struggle between the tender-minded and the tough-minded reveals how personality traits shape the very frameworks through which humanity understands truth and existence.
The Cultural Canvas of Identity
Personality can be distinguished from more dispositional temperaments as reflecting adjustment to the culture in which one lives and grows, such as what to be ashamed or proud about, and cultural values. Cross-cultural assessment depends on the universality of personality traits, which is whether there are common traits among humans regardless of culture or other factors. Two approaches to researching personality are looking at emic and etic traits, where emic traits are constructs unique to each culture determined by local customs, thoughts, beliefs, and characteristics, and etic traits are considered universal constructs that establish traits evident across cultures. The Five-Factor Model has shown clear cross-cultural applicability, with results from administering the NEO-PI-R to 7,134 people across six languages showing a similar pattern of the same five underlying constructs found in the American factor structure. However, cultural differences do exist, with Western cultures valuing individualism, independence, and assertiveness, reflected in traits such as extraversion, while Eastern cultures value collectivism, cooperation, and social harmony, reflected in traits such as agreeableness. These differences may be a consequence of using a lexical approach to study personality structures, as language has limitations in translation, or they could be due to real cultural differences, poor translations, biased sampling, or differences in response styles across cultures.