Essay On Individual Differences

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Critically discuss the understandings of individual differences produced by trait theory and personal construct theory. Interrogate these different understandings by reference to the theme of power relations. Individual differences originated in the early 20th century and it is a relatively new concept in the psychological field. Eysenck’s and Rachman’s trait theory (1965) and Kelly’s (1955) personal construct theory represented through Salmon’s phenomenological reworking of Kelly’s ideas in her approach to learning (2003) have markedly different approaches to the understanding of individual differences. The concept of individual differences is used to describe the different theories around an individual’s personality and personality type. This essay attempts to describe trait theory and the personal construct theory and it will then explore the strengths and weaknesses of both theories in the context of the study of individual differences. Galen (2nd century AD) divided people into four different personality types – choleric, melancholic, sanguine, phlegmatic. These four types describe distinct, discontinuous categories of membership that a person either belongs to or not; contrasted to traits that are dimensions of personality, which people vary. Today personality theorists prefer to think of people in terms of continuous trait dimensions. Trait theory is just one theoretical perspective that attempts to categorise and explain personality and it focuses on the measurement of traits that can be seen as behaviours or emotional responses that are stable over time (Eysenck, 1965, cited in Butt, 2004). According to Eysenck and Rachman, trait theories normally focus on the common dimensions of personality, which can be later generalised into the population as a whole and these theories basically move away from the individual. According to Butt (2007), a
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