Cioni G, Pellegrinetti G
Percept Mot Skills. 1982 Jun;54(3 Pt 2):1151-8. doi: 10.2466/pms.1982.54.3c.1151.
Lateral differences in some motor and sensory functions were examined in 89 full-term normal newborns, 2 to 4 days old. They were divided in two groups, according to the cerebral dominance in the family: Group A (70 subjects), offspring of right-handed parents and siblings, and Group B (19 subjects), with at least one parent or sibling left-handed or ambidextrous. Only subjects of Group A showed a marked tendency to spend more time with the head to right as opposed to the left, to turn right after release from the midline position, to have their heads right 5 min. later, to lead with the right leg on the placing response. The two groups were significantly different from each other on these tests. Differences were not observed for stepping, tactile responses, asymmetrical tonic neck reactions in either of the two groups. The results confirm the existence of lateral differentiations of neurological functions in the newborn and stress the presence of genetic factors in these phenomena.
对89名2至4日龄的足月正常新生儿的一些运动和感觉功能的左右差异进行了检查。根据家族中的大脑优势，他们被分为两组：A组（70名受试者），其父母和兄弟姐妹均为右利手；B组（19名受试者），至少有一名父母或兄弟姐妹是左利手或双手灵巧。只有A组的受试者表现出明显的倾向，即头部转向右侧的时间比左侧更长，从中线位置放开后向右转，5分钟后头部仍朝右，在放置反应中右腿领先。在这些测试中，两组之间存在显著差异。在两组中，对于踏步、触觉反应、不对称紧张性颈反射均未观察到差异。结果证实了新生儿神经功能存在左右分化，并强调了这些现象中遗传因素的存在。
