Twin Studies of Political Behavior: Untenable Assumptions?

@article{Beckwith2008TwinSO,
  title={Twin Studies of Political Behavior: Untenable Assumptions?},
  author={Jon Beckwith and Corey A. Morris},
  journal={Perspectives on Politics},
  year={2008},
  volume={6},
  pages={785 - 791}
}
Using the “classical twin method,” political scientists John Alford, Carolyn Funk, and John Hibbing conclude that political ideologies are significantly influenced by genetics, an assertion that has garnered considerable media attention. Researchers have long used human twins in attempts to assess the degree of genetic influence on various behavioral traits. Today, this methodology has been largely replaced in favor of contemporary molecular genetic techniques, and thus heritability studies… 

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References

SHOWING 1-10 OF 43 REFERENCES

Beyond Liberals and Conservatives to Political Genotypes and Phenotypes

In the past, most political scientists have been oblivious to the growing empirical evidence challenging environmental determinism. Professor Charney, apparently as a result of the fact that genes

The "equal environments assumption" in MZ-DZ twin comparisons: an untenable premise of psychiatric genetics?

Many MZ-DZ pedigree studies have dubious scientific value, given the non-viable premise of the EEA, as well as the misleading operational definition of what has been called "heritability".

Are Political Orientations Genetically Transmitted?

We test the possibility that political attitudes and behaviors are the result of both environmental and genetic factors. Employing standard methodological approaches in behavioral

Twin studies in behavioral research: a skeptical view.

It is suggested that no scientific purpose is served by the flood of heritability estimates generated by these studies, which attempt to estimate proportions of genetic and environmental variance for many human traits via model fitting.

Wrestling with behavioral genetics : science, ethics, and public conversation

Hardly a month goes by without a media report proclaiming that researchers have discovered the gene for some complex human behavior or trait-intelligence, dyslexia, shyness, homosexuality. The

Twin method: Defense of a critical assumption

Perceived zygosity and perceived similarity by self and others were found to be insignificant biases in the twin study method.

A test of the equal-environment assumption in twin studies of psychiatric illness

A newly developed model-fitting approach which treats perceived zygosity as a form of specified familial environment is used which supports the validity of the EEA in twin studies of psychiatric disorders.

Genes, environments & behaviors

It is certain that few organs are the subject of more misinformation in scienti1⁄2c and public discourse–especially in the widespread notion that most behaviors controlled by the authors' marvelous brain are somehow programmed into it genetically.

Rethinking twins and environments: possible social sources for assumed genetic influences in twin research.

Findings suggest that past twin studies could overstate the strength of genetic influences because some similarities in behavior among monozygotic compared to dizygotic twins stem from social influences.

Sources of human psychological differences: the Minnesota Study of Twins Reared Apart.

Evidence for the strong heritability of most psychological traits, sensibly construed, does not detract from the value or importance of parenting, education, and other propaedeutic interventions.