Behavior Genetics

, Volume 45, Issue 6, pp 635–639

The Scarr-Rowe Interaction in Complete Seven-Year WISC Data from the Louisville Twin Study: Preliminary Report

  • Eric Turkheimer
  • Christopher E. Beam
  • Deborah W. Davis
Original Research

DOI: 10.1007/s10519-015-9760-4

Cite this article as:
Turkheimer, E., Beam, C.E. & Davis, D.W. Behav Genet (2015) 45: 635. doi:10.1007/s10519-015-9760-4


We examine updated Wechsler IQ data in 7-year old twins from the Louisville Twin Study for evidence of an interaction between the heritability of IQ and socioeconomic status. Data records that had never been entered were recovered, allowing us to increase previously reported sample sizes by more than 20 %. Twin families were assigned socioeconomic status scores using a Hollingshead index based on parental education and occupation. A structural equation model in which genetic and environmental variances were modeled as squared linear functions of SES provided ambiguous replication of earlier findings from the National Collaborative Perinatal Project: relations between SES and heritability for performance and full scale IQ were in the same direction as the previous report, but at p < 0.07. As was the case in Turkheimer et al. (Psychol Sci 14(6):623–628, 2003), no interaction was found for VIQ. These results cannot yet be taken as a definitive replication of Turkheimer et al. (Psychol Sci 14(6):623–628, 2003). Many more measurement occasions, subtests and environmental moderators remain to be analyzed.


GE interaction Wechsler intelligence scale for children Socioeconomic status 

Funding information

Funder NameGrant NumberFunding Note
National Institute on Aging
  • 1R03AG048850

Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Eric Turkheimer
    • 1
  • Christopher E. Beam
    • 2
  • Deborah W. Davis
    • 3
  1. 1.Department of PsychologyUniversity of VirginiaCharlottesvilleUSA
  2. 2.University of Southern CaliforniaLos AngelesUSA
  3. 3.University of LouisvilleLouisvilleUSA

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