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The mandibular symphysis in mental defect—support for a genetic link

Published online by Cambridge University Press:  31 July 2008

Alan Sanderson ,
Patrick J. Laycock  and
Elizabeth Watson
Alan Sanderson
Affiliation:
Department of Psychiatry, University of Birmingham
Patrick J. Laycock
Affiliation:
Department of Mathematical Statistics, University of Manchester Institute of Science and Technology
Elizabeth Watson
Affiliation:
Department of Mathematics, University of Manchester
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Summary

A group of 20 brain-damaged (BD) subjects was added to the canonical analysis, reported earlier, of mandibular symphysis shape, in the following groups: (1) Down's syndrome (DS), (2) familial idiopathic sub-normality (FIS), (3) intermediate intelligence (II), and (4) high intelligence (HI). Significant separations between means were found for all pairs of groups, except only II–HI. The separation between the BD and FIS groups supports the hypothesis that a genetic mechanism (pleiotropy) underlies the link between intelligence and symphysis shape, but environmental influences probably account for most of the separation between the BD and the two normal groups. The findings have implications for the study of behaviour genetics

Type
Research Article
Information
Journal of Biosocial Science , Volume 8 , Issue 3 , July 1976 , pp. 267 - 276
Copyright
Copyright © 1976, Cambridge University Press

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References

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