Tan U, Ors R, Kürkçüoglu M, Kutlu N
Atatürk University, Medical Faculty, Department of Physiology, Erzurum, Turkey.
Int J Neurosci. 1992 Jan;62(1-2):1-8. doi: 10.3109/00207459108999752.
The strength of the grasp reflex from the right and left hands was estimated in male and female newborns within the second day after birth. In the total sample (N = 121), the mean strength of the grasp reflex from the right hand was found to be significantly higher than that from the left hand. There was a significant positive linear correlation between reflex strengths from the right and left hands. The mean right minus left (R - L) reflex strength was found to be significantly larger than zero. There was a positive linear relationship between the R-L reflex strength and the reflex strengths from the right and left hands. This was more pronounced for the right hand than the left hand. The reflex strengths from the right and left hands were found to be positively linearly correlated with the weight of the newborn babies. These results indicated a grasp reflex lateralization in newborns. The right-bias in the grasp-reflex asymmetry established in this work would create a basis for the development of the right-hand preference in adulthood.
在出生后第二天内，对男、女新生儿的右手和左手抓握反射强度进行了评估。在总样本（N = 121）中，发现右手抓握反射的平均强度显著高于左手。右手和左手的反射强度之间存在显著的正线性相关。发现右手减去左手（R - L）的平均反射强度显著大于零。R - L反射强度与右手和左手的反射强度之间存在正线性关系。这种关系在右手上比左手上更为明显。发现右手和左手的反射强度与新生儿体重呈正线性相关。这些结果表明新生儿存在抓握反射偏侧化。本研究中确立的抓握反射不对称的右偏将为成年后右手偏好的发展奠定基础。
