Tan U, Zor N
Department of Physiology, Medical Faculty, Atatürk University, Erzurum, Turkey.
Int J Neurosci. 1994 Mar;75(1-2):9-18. doi: 10.3109/00207459408986284.
The relation of the grasp-reflex strength to serum free-testosterone level was studied in human neonates with right and left ear facing out in utero positions. The grasp-reflex strengths from the right and left hands were found to be inversely correlated with testosterone in neonates with right-ear-out position. In neonates with left-ear-out in utero position, the grasp-reflex strength only from the left hand inversely correlated with testosterone. Left-dominance decreased and right dominance in grasp reflex increased linearly with testosterone only in females with left-ear-out in utero position. These results supported the theory of prenatal origins of cerebral lateralization (Previc, 1991). It was concluded that testosterone may favour the maturation of both hemispheres in neonates with right-ear-out in utero position, and only the right-hemispheric development in subjects with left-ear-out in utero position; testosterone may be a male hormone influencing the cerebral lateralization on the ground of genetically and even environmentally predetermined cerebral organization.
在子宫内处于右耳和左耳朝外位置的人类新生儿中，研究了抓握反射强度与血清游离睾酮水平的关系。发现处于右耳朝外位置的新生儿，其右手和左手的抓握反射强度与睾酮呈负相关。在子宫内处于左耳朝外位置的新生儿中，仅左手的抓握反射强度与睾酮呈负相关。仅在子宫内处于左耳朝外位置的女性中，抓握反射的左优势降低，右优势随睾酮呈线性增加。这些结果支持了大脑半球侧化的产前起源理论（普雷维克，1991年）。得出的结论是，睾酮可能有利于子宫内处于右耳朝外位置的新生儿双侧半球的成熟，而仅有利于子宫内处于左耳朝外位置的受试者的右半球发育；基于遗传甚至环境预先确定的大脑组织，睾酮可能是一种影响大脑半球侧化的雄性激素。
