PSYCH 2B03 Lecture 31: Lecture 31 PSYCH 2B03.docx
8 Feb 2014
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Correlation for dz are less than half the mz. Therefore, there can be less confidence put in this data. Correlation for mz twins reared apart should be the highest. Neuroticism and imagination appear as the highest; achievement and leadership are the lowest. Adoption studies: look at biological children and adopted children. Look at a few of the generic traits of interest (temperament, anxiety etc. ) 0. 22 for parents with children; 0. 26 for siblings half of what is expected for twins. Environmental factors contribute more than what is estimated by twin studies. Did not use twins so other biases are removed underlines the importance of environment over genetics. Had mz and dz twins, so all 3 heritability coefficient formulae can be used. This data more similar to scar et al. Variability contributed by genetics in young people may be more similar because they have had less experience with the world. Earlier twin studies overestimated genetic influence; rue data around 0. 25 and 0. 3.
