Bishop Dorothy V M
Department of Experimental Psychology, University of Oxford, Oxford OX2 6GG, UK.
R Soc Open Sci. 2024 Aug 14;11(8):240495. doi: 10.1098/rsos.240495. eCollection 2024 Aug.
In a study of patterns of language laterality in left- and right-handers, Woodhead . (Woodhead ZVJ, Thompson PA, Karlsson EM, Bishop DVM. 2021 . , 200696. (doi:10.1098/rsos.200696)) noted that several tasks showed no bias to the left hemisphere in left-handed individuals. This might appear to suggest that these functions were mediated by the two hemispheres working together equally-what can be termed 'hemispheric equipoise'. Here, I consider an alternative possibility that individuals show lateral bias on these tasks, but the bias can occur to either the left or right-a form of fluctuating asymmetry. Further analysis of the distributions of data from individuals in Woodhead is compared with simulated data. The pattern of results suggests that the impression of hemispheric equipoise may be an artefact of reliance on group data: even though the group mean does not differ from zero, a high proportion of individuals are biased to the left or right.
在一项针对左撇子和右撇子语言偏侧性模式的研究中，伍德黑德（伍德黑德ZVJ、汤普森PA、卡尔松EM、毕晓普DVM。2021年。，200696。（doi:10.1098/rsos.200696））指出，在一些任务中，左撇子个体并未表现出对左半球的偏向。这可能似乎表明，这些功能是由两个半球平等协作介导的——即所谓的“半球平衡”。在此，我考虑另一种可能性，即个体在这些任务上表现出偏侧性偏向，但这种偏向可能出现在左侧或右侧——这是一种波动不对称的形式。将伍德黑德研究中个体数据的分布与模拟数据进行进一步分析比较。结果模式表明，半球平衡的印象可能是依赖群体数据的一种假象：即使群体均值与零无差异，但仍有很大比例的个体偏向左侧或右侧。
