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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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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 18 January 2022

Family Studies of Intellectual Abilities in Adulthood

Family Studies of Intellectual Abilities in Adulthood

(p.318) chapter fourteen Family Studies of Intellectual Abilities in Adulthood
Developmental Influences on Adult Intelligence

K. Warner Schaie

Oxford University Press

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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