Quantifying cerebral asymmetries for language in dextrals and adextrals with random-effects meta analysis

Carey, David P. and Johnstone, Leah T. (2014) Quantifying cerebral asymmetries for language in dextrals and adextrals with random-effects meta analysis. Frontiers in Psychology. ISSN 1664-1078

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Abstract

Speech and language-related functions tend to depend on the left hemisphere more than the right in most right-handed (dextral) participants. This relationship is less clear in non-right handed (adextral) people, resulting in surprisingly polarized opinion on whether or not they are as lateralized as right handers. The present analysis investigates this issue by largely ignoring methodological differences between the different neuroscientific approaches to language lateralization, as well as discrepancies in how dextral and adextral participants were recruited or defined. Here we evaluate the tendency for dextrals to be more left hemisphere dominant than adextrals, using random effects meta analyses. In spite of several limitations, including sample size (in the adextrals in particular), missing details on proportions of groups who show directional effects in many experiments, and so on, the different paradigms all point to proportionally increased left hemispheric dominance in the dextrals. These results are analyzed in light of the theoretical importance of these subtle differences for understanding the cognitive neuroscience of language, as well as the unusual asymmetry in most adextrals.

Item Type:	Article
Additional Information:	© 2014 Carey and Johnstone. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Faculty \ School:	Faculty of Social Sciences > School of Psychology
Depositing User:	Pure Connector
Date Deposited:	30 Nov 2016 00:02
Last Modified:	22 Oct 2022 01:56
URI:	https://ueaeprints.uea.ac.uk/id/eprint/61531
DOI:	10.3389/fpsyg.2014.01128

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