Human Motor Systems Laboratory, University of São Paulo, São Paulo, Brazil.
Infant Behav Dev. 2012 Dec;35(4):742-50. doi: 10.1016/j.infbeh.2012.06.007. Epub 2012 Sep 13.
In the present study we evaluated the relationship between manual preference and intermanual performance asymmetry in reaching of 5-month-old infants. Manual preference was assessed through frequency of reaches toward toys presented at midline, left or right in egocentric coordinates. Intermanual performance asymmetry was evaluated through kinematic analysis. Results showed that performance was predominantly symmetric between hands. Lateral toy positions induced predominance of ipsilateral reaching, while the midline position led to equivalent distribution between right and left handed reaches. No significant correlation between manual preference and intermanual performance asymmetry was observed. These results converge against the notion that manual preference derives from a genetically determined advantage of movement control favoring the right hand.
在本研究中，我们评估了 5 个月大婴儿伸手时的手偏好与手间表现不对称性之间的关系。手偏好通过在以自我为中心的坐标系中位于中线、左侧或右侧的玩具的伸手频率来评估。手间表现不对称性通过运动学分析来评估。结果表明，双手之间的表现主要是对称的。玩具位于外侧会导致同侧伸手占主导，而中线位置则导致右手和左手的伸手分布相当。手偏好与手间表现不对称性之间没有显著的相关性。这些结果与手偏好源自于有利于右手的运动控制的遗传优势的观点相矛盾。
