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Sinistrality is associated with (slightly) lower general intelligence: a data synthesis and consideration of secular trend data in handedness

Woodley of Menie, Michael A., Fernandes, Heitor B. F., Kanazawa, Satoshi and Dutton, Edward (2018) Sinistrality is associated with (slightly) lower general intelligence: a data synthesis and consideration of secular trend data in handedness. HOMO, 69 (3). pp. 118-126. ISSN 0018-442X

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Identification Number: 10.1016/j.jchb.2018.06.003

Abstract

The relationship between the general factor of intelligence (g) and handedness is investigated using a combined sample of 23511 respondents from three large databases: the NLSY’79 (US), NLSY’97 (US) and NCDS (UK). Dextrals – those who use their right hands were found to be 1.22 IQ points higher than sinistrals (left handers) after controling for sex and age and correcting for sources of measurement error. To see if the association between IQ and handedness was strongest on the abilities that were the best measures of g, the method of correlated vectors was used to test for moderation. Across the three studies, g was found to very weakly negatively moderate the association between ability measure and handedness (ρ=-.023, K=3, N=23511), however in the NLSY’79, the coding speed subtest was an outlier in terms of the strength of its association with handedness. Its removal yielded indications of positive moderation in this dataset, which when aggregated boosted the overall vector correlation value to .539 (K=3, N=23511), suggesting that g might be an important moderator of this relationship. Secondary analysis of secular trend data on the changing percentage of sinistrals in Western populations indicates that overall, sinistrality has increased, entailing a g decline of .106 points over 150 years (.006 points per decade). The secular increase in sinistrality is consistent with other data indicating long-term declines in developmental stability and may stem from some combination of increasing mutation load and advancing maternal age in Western populations.

Item Type: Article
Official URL: https://www.journals.elsevier.com/homo
Additional Information: © 2018 Elsevier GmbH
Divisions: Management
Subjects: B Philosophy. Psychology. Religion > BF Psychology
H Social Sciences > H Social Sciences (General)
Sets: Departments > Management
Date Deposited: 20 Jun 2018 09:22
Last Modified: 20 Feb 2019 06:49
URI: http://eprints.lse.ac.uk/id/eprint/88379

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