Tan U, Ors R, Kürkçüoglu M, Kutlu N, Cankaya A
Atatürk University, Medical Faculty, Department of Physiology, Erzurum, Turkey.
Int J Neurosci. 1992 Jan;62(1-2):9-16. doi: 10.3109/00207459108999753.
Grasp-reflex asymmetry was studied in human newborns with regard to familial sinistrality (FS). In the total sample, the following results were obtained. The mean grasp-reflex strength from the right hand was found to be significantly greater than that from the left hand in FS- subjects. There was no significant difference between these parameters in FS+ subjects. The mean right minus left (R-L) reflex strength was significantly greater than zero in FS- subjects. The mean R-L reflex did not significantly differ from zero in FS+ subjects. The mean reflex strength from the right hand was found to be significantly greater in FS- subjects than FS+ subjects. There was no significant difference between the mean reflex strengths from the left hands of the FS- and FS+ subjects. The mean R-L reflex in subjects FS- was found to be significantly greater than that in FS+ subjects. Similar results were obtained from the male and female subjects. It was concluded that FS is an important factor determining the degree of the grasp-reflex asymmetry in newborns. The relatively left-biased grasp-reflex asymmetry under the influence of FS indicates a genetic origin of the motor asymmetry in newborns. This, in turn, suggests that cerebral lateralization inducing manual asymmetry in humans may have been preprogrammed genetically.
研究了人类新生儿抓握反射不对称与家族性左利手（FS）的关系。在总样本中，得到了以下结果。在FS-受试者中，发现右手的平均抓握反射强度显著大于左手。在FS+受试者中，这些参数之间没有显著差异。在FS-受试者中，平均右减左（R-L）反射强度显著大于零。在FS+受试者中，平均R-L反射与零没有显著差异。发现FS-受试者右手的平均反射强度显著大于FS+受试者。FS-和FS+受试者左手的平均反射强度之间没有显著差异。发现FS-受试者的平均R-L反射显著大于FS+受试者。在男性和女性受试者中也得到了类似的结果。得出的结论是，FS是决定新生儿抓握反射不对称程度的一个重要因素。在FS影响下相对偏向左侧的抓握反射不对称表明新生儿运动不对称的遗传起源。这反过来又表明，导致人类手部不对称的大脑侧化可能在基因上是预先编程的。
