2011

On the Sources of the Height-Intelligence Correlation: New Insights from a Bivariate ACE Model with Assortative Mating

Reprint No. 2011:41

Author(s): Jonathan Beauchamp, David Cesarini, Magnus Johannesson, Erik Lindqvist and Coren ApicellaYear: 2011 Title: Behavior Genetics Volume (No.): 41 (2) Pages: 242–252
Online article (restrictions may apply)

On the Sources of the Height-Intelligence Correlation: New Insights from a Bivariate ACE Model with Assortative Mating Jonathan Beauchamp, David Cesarini, Magnus Johannesson, Erik Lindqvist and Coren Apicella


A robust positive correlation between height and intelligence, as measured by IQ tests, has been established in the literature. This paper makes several contributions toward establishing the causes of this association. First,we extend the standard bivariate ACE model to account for assortative mating. The more general theoretical framework provides several key insights, including formulas to decompose a crosstrait genetic correlation into components attributable to assortative mating and pleiotropy and to decompose a crosstrait within-family correlation. Second, we use a large dataset of male twins drawn from Swedish conscription records and examine how well genetic and environmental factors explain the association between (i) height and intelligence and (ii) height and military aptitude, a professional psychogologist’s assessment of a conscript’s ability to dealwithwartime stress. For both traits, we find suggestive evidence of a shared genetic architecture with height, but we demonstrate that point estimates are very sensitive to assumed degrees of assortative mating. Third, we report a significant within-family correlation between height and intelligence, suggesting that pleiotropy might be at play.
 


Reference:
Beauchamp, Jonathan, David Cesarini, Magnus Johannesson, Erik Lindqvist and Coren Apicella (2011), "On the Sources of the Height-Intelligence Correlation: New Insights from a Bivariate ACE Model with Assortative Mating". Behavior Genetics 41(2), 242–252.

Erik Lindqvist

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