PSYCH 2B03 Lecture Notes - Twin Study, Heritability, Psych
18 Jun 2013
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High estimates of heritability, and dramatic differences between dz and mz. Heritability estimates calculated using classic twin data are overestimates, typical heritability coefficient is . 5 in other studies using non twin studies, but family studies instead, the estimates of heritability were between . 25 and . 3. Satsa study came to the conclusion that the estimate is somewhere in the neighbourhood of . 3. Heritability coefficient isn t about any individual, only takes about where the variation in the population comes from, 30% variable only applies to this sample, not a constant. Comes primarily from non-shared environment and error. Non-shared environment is greater than the sum of genetics and shared environment. A lot of variables which contribute to non-shared environment. Best we can do is talk about the sources of variability. Nature of theory and the role of theory and hypothetical constructs. Personality is an invention to help us understand people. Pattern of consistencies are different from person to person.
