Trait theorists attempt to explain our personality by identifying our stable characteristics and ways of behaving. The Five Factor Model is the most widely accepted trait theory today. Summarize the similarities and differences among Allport's, Cattell's, and Eysenck's trait theories of personality Key Points Traits are characteristic ways of behaving, such as extraversion–introversion: an individual may fall along any point in the continuum, and where they fall determines how they will respond in various contexts. The five factors are openness, conscientiousness, extroversion, agreeableness, and neuroticism. Toward the beginning of the 2oth Century, however, views began to change and personality was seen as involving both biology and environment. Each of Eysenck’s factors is a bipolar dimension, which means that each has an opposite. Pros and cons of Eysenck's personality theory • Pros Measurement allows empirical investigation Able to assess the heritability or consistency of personality • Cons Sometimes invalid as personality may change No explanation of the reasons Self-report may lead to inaccuracy No consensus in understanding of the items across culture Hans Eysenck… They have identified important dimensions of personality. As a result of a thorough research on Cattell's and Eysenck's personality trait theories, the Big Five theory was formulated. Cattell’s trait theory has been built around the use of factor analysis, a mathematical technique devised by Charles Spearman. Unlike Eysenck, Cattell based his theory on various sources rather than just self reporting. Eysenck's theory is based on physiology and genetics. This model states that there are 5 core traits which collaborate in order to form a single personality. Trait theory is one of the major approaches to the study of human personality. Hans Eysenck. Eysenck fought hard against the trend that personality involves biology and the environment. Hans and Sybil Eysenck developed the Eysenck Personality Questionnaire (EPQ) to address the traits described in the model (Eysenck and Eysenck, 1976). Using factor analysis to design his theory, Hans Eysenck identified three personality factors: psychoticism, extraversion, and neuroticism (PEN). The two initial dimensions of Eysenck’s theory of personality, extraversion and neuroticism, are also common to Robert McCrae and Paul Costa’s Five-Factor Model ( McCrae and Costa, 1987 ). Eysenck argued that the ANS becomes over aroused in neurotics, leading to higher levels of violence (behaviour controlled by the limbic system.) Hans Eysenck’s PEN model of personality. Eysenck's theory of personality was created in 1947. Eysenck stated that personality differences is someone growing out of their genetic inheritance. 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