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Developmental Influences on Adult IntelligenceThe Seattle longitudinal study$
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K. Warner Schaie

Print publication date: 2005

Print ISBN-13: 9780195156737

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780195156737.001.0001

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Family Studies of Intellectual Abilities in Adulthood

Family Studies of Intellectual Abilities in Adulthood

Chapter:
(p.318) chapter fourteen Family Studies of Intellectual Abilities in Adulthood
Source:
Developmental Influences on Adult Intelligence
Author(s):

K. Warner Schaie

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195156737.003.0014

This chapter gives an account of family studies of intellectual abilities in adulthood designed to consider similarities in adult parent-offspring and sibling pairs as well as similarity in married couples. Of particular interest is new material on changes in the rate of cognitive change across biologically related generations. Married couples were studied for as long as twenty-one years. They showed significant initial within-couple correlations on verbal meaning, inductive reasoning, and word fluency, and social responsibility, and on the Index of Educational Aptitude, even when age and education were controlled. Spousal similarity increased by length of marriage on verbal meaning, and attitudinal flexibility, and on the Index of Intellectual Ability.

Keywords:   Seattle Longitudinal Study, family studies, intellectual abilities, adulthood, siblings, cognitive changes, married couples

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