Integrative Neuroscience Cognitive Center, University Paris Descartes CNRS, Paris, France.
Department of Psychology, The University of Tennessee Knoxville, Knoxville, TN, USA.
Laterality. 2020 Jul;25(4):455-468. doi: 10.1080/1357650X.2020.1729171. Epub 2020 Feb 18.
Although a population bias toward right-hand preference is observed at the early stage of grasping, hand preference fluctuates in infancy. Given these fluctuations, one can wonder whether testing a young infant on a single occasion gives reliable results of its handedness. Very few studies have evaluated short-term test-retest reliability. This was the goal of this study in which 21 infants aged 9-15 months were tested for handedness every day for a total of 5 sessions. The infants were given a classical handedness baby test. Their handedness index (HI) and their category of handedness were compared across sessions. The results show that at the group level the distribution of handedness does not differ significantly across the five sessions. At the individual level, only 19% of infants were categorized as right-handed at all five sessions while 52.4% were consistent in using more one hand than the other across the five sessions (right hand: 47.6%). Most of the fluctuations across sessions occurred between being lateralized and non-lateralized rather than between being right-handed and left-handed. These figures indicate that testing handedness at that age gives fairly reliable results in terms of direction of hand preference, but less so in terms of degree.
虽然在抓握的早期阶段观察到了偏向于右手偏好的人群，但手偏好会在婴儿期波动。考虑到这些波动，人们可能会想知道在单次测试中测试一个婴儿是否能得到其惯用手的可靠结果。很少有研究评估短期重测信度。这就是本研究的目的，在这项研究中，21 名 9-15 个月大的婴儿每天接受一次惯用手测试，共进行 5 次测试。婴儿接受了经典的惯用手婴儿测试。在整个测试过程中，比较了他们的惯用手指数（HI）和惯用手类型。结果表明，在组水平上，五次测试中惯用手的分布没有显著差异。在个体水平上，只有 19%的婴儿在所有五次测试中被归类为右撇子，而 52.4%的婴儿在五次测试中始终使用一只手多于另一只手（右手：47.6%）。大多数波动发生在偏向手和非偏向手之间，而不是在惯用右手和惯用左手之间。这些数据表明，在这个年龄段测试惯用手在方向上给出了相当可靠的结果，但在程度上则不然。
