Laboratoire de Psychologie et Neuropsychologie Cognitive (FRE 3292), Université Paris Descartes - CNRS, Boulogne-Billancourt, France.
Laterality. 2013;18(2):231-50. doi: 10.1080/1357650X.2012.660163. Epub 2012 Jun 1.
This longitudinal study examined lateral differences between latency time of the two hands during the development of prehension in 12 infants from 20 to 30 weeks. Latency time (LT) is defined as the delay between the visual localisation of a reachable target and the beginning of the movement and could be considered as a phase in the preparation of action. If LT varies with the hand used and the type of movement, this would suggest differences in information processing (nature and/or quantity). Results show that the latency time is shorter for the left hand approach movements and shorter for the right hand grasping movements. These findings are in favour of a manual specialisation--clearly present from 20 weeks--and are discussed in a possible hemispheric specialisation perspective.
本纵向研究考察了 12 名 20 至 30 周婴儿抓握发展过程中双手潜伏期的横向差异。潜伏期（LT）定义为视觉定位可及目标与运动开始之间的延迟，可被视为动作准备的一个阶段。如果 LT 随使用的手和运动类型而变化，这将表明信息处理（性质和/或数量）存在差异。结果表明，左手接近运动的潜伏期较短，右手抓握运动的潜伏期较短。这些发现支持了从 20 周开始就明显存在的手部专业化，并从可能的半球专业化角度进行了讨论。
