School of Social and Behavioral Sciences, University of Arkansas at Monticello.
Department of Psychology, University of Toledo.
Percept Mot Skills. 2020 Oct;127(5):789-802. doi: 10.1177/0031512520927562. Epub 2020 Jun 2.
Although consistency of handedness (the strength of dominant hand preference) is increasingly recognized as an important individual difference, there are questions about how to best measure it. A recent meta-analysis showed that researchers have often failed to report details of responses and response formats to handedness test items. In addition to measuring handedness direction (i.e., left versus right handedness), there can be utility to dichotomizing the Edinburgh Handedness Inventory (EHI) into consistent and inconsistent dominant handedness, despite controversy over the best means of doing so. In this study, we performed a discriminant function analysis of EHI items to determine which items best predicted handedness consistency versus handedness direction. Although the same discriminant function accounted for most of the variance for both dependent measures, and EHI items were the strongest predictors of handedness direction and and items were the strongest predictors of handedness consistency. As different items on the EHI predicted these different handedness dimensions, we discuss the implications of dichotomizing EHI items into both relevant dimensions for both biological and environmental theories of the basis of handedness and for future handedness research.
尽管惯用手的一致性（优势手偏好的强度）越来越被认为是一个重要的个体差异，但如何最好地衡量它仍存在一些问题。最近的一项荟萃分析表明，研究人员经常未能报告惯用手测试项目的反应和反应格式的详细信息。除了测量惯用手方向（即左利手与右利手）之外，将爱丁堡手倾向问卷（EHI）分为一致和不一致的优势手倾向，可能具有一定的作用，尽管对于最佳方法存在争议。在这项研究中，我们对 EHI 项目进行了判别函数分析，以确定哪些项目最能预测惯用手一致性与惯用手方向。虽然相同的判别函数解释了这两个因变量的大部分方差，但 EHI 的 和 项目是惯用手方向的最强预测因子，而 EHI 的 和 项目是惯用手一致性的最强预测因子。由于 EHI 上的不同项目预测了这些不同的惯用手维度，我们讨论了将 EHI 项目分为与惯用手的生物学和环境理论基础以及未来惯用手研究相关的两个维度的意义。
