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There are many similarities in Big Five trait expression across cultures. For example, differences between men and women in Big Five traits, although small compared to variation within gender, do seem to exist consistently across a number of cultures. In general, women tend to score higher on neuroticism and agreeableness. [9]
For example, although gradual memory impairment is the hallmark feature of Alzheimer's disease, a systematic review of personality changes in Alzheimer's disease by Robins Wahlin and Byrne, published in 2011, found systematic and consistent trait changes mapped to the Big Five. The largest change observed was a decrease in conscientiousness.
Intelligence and personality have some common features; for example, they both follow a relatively stable pattern throughout the whole of one’s life, and are to some degree genetically determined. [1] [2] In addition, they are both significant predictors of various outcomes, such as educational achievement, occupational performance, and health.
Traits are in contrast to states, which are more transitory dispositions. Some traits are something a person either has or does not have. In other traits, such as extraversion vs. introversion, each person is judged to lie along a spectrum. Trait theory suggests that some natural behaviours may give someone an advantage in a position of ...
The term type has not been used consistently in psychology and has become the source of some confusion. Furthermore, because personality test scores usually fall on a bell curve rather than in distinct categories, [6] personality type theories have received considerable criticism among psychometric researchers.
A phenotypic trait is an obvious, observable, and measurable characteristic of an organism; it is the expression of genes in an observable way. An example of a phenotypic trait is a specific hair color or eye color. Underlying genes, that make up the genotype, determine the hair color, but the hair color observed is the phenotype.
Mendelian traits behave according to the model of monogenic or simple gene inheritance in which one gene corresponds to one trait. Discrete traits (as opposed to continuously varying traits such as height) with simple Mendelian inheritance patterns are relatively rare in nature, and many of the clearest examples in humans cause disorders.
Therefore no trait is purely Mendelian, but many traits are almost entirely Mendelian, including canonical examples, such as those listed below. Purely Mendelian traits are a minority of all traits, since most phenotypic traits exhibit incomplete dominance, codominance, and contributions from many genes.