PSYCH 2B03 Chapter Notes - Chapter 9: California Psychological Inventory, Eysenck Personality Questionnaire, Twin Study
18 Mar 2013
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Document Summary
The inheritance of personality: behavioural genetics and evolutionary theory. Personality trait: pattern of behaviour that"s relevant to more than one situation. Eysenck personality questionnaire (epq) and california psychological inventory (cpi) are both commonly used in twin studies, also directly observe them in labs. Across many traits, average correlation across mz is 0. 6, dz = 0. 4 (controlled for age/gender) coefficient of 0. 4, proportion of phenotypic variance can be explained by genetic variance is 40% Can also do studies with siblings , relatives estimates of 20%, which is half: note: full siblings share 50% of variable genes, half siblings 25% Humans don"t have that many more genes compared to worms and fruitflies, meaning that there has to be more than just additive genetic effects. Genes matter for a long time, assumed that everything determined environmentally first law of behavioural genetics: everything is inheritable. Harris: argued that the parents and the family environment doesn"t matter at all.
