McManus, C;
(2021)
Is any but a tiny fraction of handedness variance likely to be due to the external environment?
Laterality
, 26
(3)
pp. 310-314.
10.1080/1357650X.2021.1892126.
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Abstract
Non-shared environmental variance (NSEV) accounts for 76% of variance in genetic modelling of handedness. However, it is very misleading to suggest that NSEV, “highlights the importance of non-genetic factors for the ontogenesis of hemispheric asymmetries”. NSEV is poorly named, is calculated only by subtraction, and provides no direct evidence for environmental effects in the sense of the external environment. Miller suggested that it would be better named as “residual effect”. Mitchell has suggested that much or indeed most of NSEV is “developmental variance” and should be included under the heading of nature rather than nurture, and in handedness, “largely reflect[s] the outcome of randomness in brain development”. Overall only a very small proportion of NSEV in handedness is likely to be related to external environmental factors in the usual sense of the term.
| Type: | Article |
|---|---|
| Title: | Is any but a tiny fraction of handedness variance likely to be due to the external environment? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1080/1357650X.2021.1892126 |
| Publisher version: | https://doi.org/10.1080/1357650X.2021.1892126 |
| Language: | English |
| Additional information: | Copyright © 2021 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License (http://creativecommons.org/licenses/by-nc-nd/4.0/), which permits non-commercial re-use, distribution, and reproduction in any medium, provided the original work is properly cited, and is not altered, transformed, or built upon in any way. |
| Keywords: | Handedness, non-shared environmental variance (NSEV), developmental variance, environmental influences |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > UCL Medical School |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10125073 |
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