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Chapter

Psychology in Modules: Module 31

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Department
Psychology
Course
PSYC 1010
Professor
Rebecca Jubis
Semester
Winter

Description
Module 31 Page 1 Module 31 Genetic and Environmental Influences on Intelligence Twin and Adoption Studies • Intelligence tests scores of identical twins almost identical. Fraternal twins who share less 1/2 their genes are less similar • Hereditability - the proportion of variation among individuals that we can attribute to genes. The heritability of a trait may vary, depending on the range of populations and environments studied. • Brain scans of identical twins share similar grey and white matter volume and same in areas associated with verbal and spatial intelligence • Intelligence appears to be polygenetic - involving many genes • Genetic influences not environmental ones become more apparent as we accumulate life experience Environmental Influences • Babies in an Iranian orphanage developed little sense of personal control over their environment (could not sit up by 2 or walk by 4) • An enriched
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