Four meta-analyses across 164 studies on atypical footedness prevalence and its relation to handedness.
Julian Packheiser,Judith Schmitz,Gessa Berretz,David P. Carey,Silvia Paracchini,Marietta Papadatou-Pastou,Sebastian Ocklenburg,Sebastian Ocklenburg +7 more
TLDR
It was showed that the prevalence of atypical footedness ranges between 12.10% using the most conservative criterion of left-footedness to 23.7% including all left- and mixed-footers as a single non-right category, and that footing is a valuable phenotype for the study of lateral motor biases, its underlying genetics and neurodevelopment.Abstract:
Human lateral preferences, such as handedness and footedness, have interested researchers for decades due to their pronounced asymmetries at the population level. While there are good estimates on the prevalence of handedness in the population, there is no large-scale estimation on the prevalence of footedness. Furthermore, the relationship between footedness and handedness still remains elusive. Here, we conducted meta-analyses with four different classification systems for footedness on 145,135 individuals across 164 studies including new data from the ALSPAC cohort. The study aimed to determine a reliable point estimate of footedness, to study the association between footedness and handedness, and to investigate moderating factors influencing footedness. We showed that the prevalence of atypical footedness ranges between 12.10% using the most conservative criterion of left-footedness to 23.7% including all left- and mixed-footers as a single non-right category. As many as 60.1% of left-handers were left-footed whereas only 3.2% of right-handers were left-footed. Males were 4.1% more often non-right-footed compared to females. Individuals with psychiatric and neurodevelopmental disorders exhibited a higher prevalence of non-right-footedness. Furthermore, the presence of mixed-footedness was higher in children compared to adults and left-footedness was increased in athletes compared to the general population. Finally, we showed that footedness is only marginally influenced by cultural and social factors, which play a crucial role in the determination of handedness. Overall, this study provides new and useful reference data for laterality research. Furthermore, the data suggest that footedness is a valuable phenotype for the study of lateral motor biases, its underlying genetics and neurodevelopment.read more
Citations
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[About meta-analyses].
TL;DR: The methodological comment is focused on the limitations, biases, misleading implications which are today threatening the role of metanalytical analyses of existing literature, to produce useful-reliable evidences in areas where the representativeness of the source of data is substantially scarce.
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Laterality 2020: entering the next decade
TL;DR: Which trends are likely to shape laterality research in the 2020s include, but are not limited to, finding laterality-specific solutions to the replication crisis, and integrating non-W.E.I.R.D. samples intoLaterality research to a larger extent.
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Birth Order and Lateral Preferences
Israel Nachshon,Deborah W. Denno +1 more
TL;DR: Analysis of cross preferences indicated some tendency for a consistent right side orientation, however, patterns of lateral preferences were similar for both boys and girls across seven birth order groups.
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A large-scale estimate on the relationship between language and motor lateralization
Julian Packheiser,Judith Schmitz,Larissa Arning,Christian Beste,Onur Güntürkün,Sebastian Ocklenburg,Sebastian Ocklenburg +6 more
TL;DR: The findings indicate that the direct associations between language lateralization and motor asymmetries are much weaker than previously assumed with Bayesian correlation analyses even suggesting that they do not exist at all.
Journal ArticleDOI
Paw preferences in mice and rats: Meta-analysis
TL;DR: In this paper, the authors used meta-analysis to statistically integrate findings on paw preferences in rats and mice, and found significant hemispheric asymmetries on the individual level.
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