Tan U, Zor N
Department of Physiology, Medical Faculty, Ataturk University, Erzurum, Turkey.
Int J Neurosci. 1994 Jan-Feb;74(1-4):27-32. doi: 10.3109/00207459408987226.
The grasp-reflex strengths from right (R) and left (L) hands were studied in human neonates in relation to serum cortisol levels and fetal position. In males with right-ear out, there was no correlation between grasp-reflex strength from right hand and cortisol. The grasp-reflex strength from left hand significantly decreased as cortisol increased linearly in these subjects. In males with left-ear out, the grasp-reflex strengths from right and left hands were found to be negatively linearly correlated with serum cortisol level. In females with right-ear out, the grasp-reflex strength from right hand was not significantly correlated with cortisol, but grasp reflex from left hand linearly decreased as cortisol increased. In females with left-ear out, only the grasp reflex from right hand linearly increased with cortisol. Only in males with right-ear out, the R-L grasp-reflex strength linearly increased from left dominance toward right dominance. It was concluded that the stress hormone cortisol may be disadvantageous and/or advantageous for the prenatal development of the right and left brain according to fetal position; cortisol may also affect the emergence of cerebral lateralization.
研究了人类新生儿右手（R）和左手（L）的抓握反射强度与血清皮质醇水平及胎位的关系。在右耳朝外的男性中，右手抓握反射强度与皮质醇之间无相关性。在这些受试者中，随着皮质醇呈线性增加，左手抓握反射强度显著降低。在左耳朝外的男性中，发现右手和左手的抓握反射强度与血清皮质醇水平呈负线性相关。在右耳朝外的女性中，右手抓握反射强度与皮质醇无显著相关性，但随着皮质醇增加，左手抓握反射呈线性降低。在左耳朝外的女性中，只有右手抓握反射随皮质醇呈线性增加。只有在右耳朝外的男性中，R-L抓握反射强度从左优势向右侧优势呈线性增加。得出的结论是，应激激素皮质醇根据胎位可能对左右脑的产前发育不利和/或有利；皮质醇也可能影响大脑侧化的出现。
