PSYC 1010 Lecture Notes - Lecture 10: Twin, Intelligence Quotient, Flynn Effect
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2 major views: iq reflects a general capacity for reasoning a problem-solving, iq is a set of individual abilities and not a general trait. Determines whether a question on a test is related to one another. Intercorrelated to every single question on a test. Family studies: access the reference of heredity on iq by examining blood relatives (not inlaws) and seeing how similar they are on iq scores. The more closely that pairs of people are related the higher the correlation in iq score. First degree relative: brother and sister: share 50% genes. Second degree relative: niece and nephews : share 25% of their genes third degree relative: cousins: share 12. 5% of their genes. Most genetically similar have the highest correlation in iq suggesting their genetic, but it could be their environment because siblings grow up in the same environment. Twin studies: identical twins are compared to fraternal twins.