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Senatorial signatures

Absence of male-female differences in left-handedness

Published online by Cambridge University Press:  05 July 2021

Nancy L. Segal Open the ORCID record for Nancy L. Segal [Opens in a new window]  and
Francisca J. Niculae
Nancy L. Segal*
Affiliation:
California State University, Fullerton
Francisca J. Niculae
Affiliation:
California State University, Fullerton
*
Correspondence: Nancy L. Segal, California State University, Fullerton. Email: nsegal@fullerton.edu
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Abstract

A greater frequency of left-handedness among males than females has been observed in general populations. Past studies have explained this difference with reference to males’ greater susceptibility to adverse birth events, while more recent studies have identified other contributing factors. On January 16, 2020, U.S. senators signed an oath to act impartially during the president’s impeachment trial. This televised event allowed direct comparison of the proportion of right-handedness and left-handedness in a professionally accomplished sample of males and females. As expected, no sex difference in the proportion of left-handed senators was found, although the small sample size offered low statistical power. Replicating this finding with a larger sample would support the view that left-handedness among select groups of males is linked to genetic factors.

Keywords

Left-handednessright-handednessmalesfemales
Type
Research Notes
Information
Politics and the Life Sciences , Volume 41 , Issue 1 , Spring 2022 , pp. 38 - 44
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of the Association for Politics and the Life Sciences

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