Clark M M, Santamaria B T, Robertson R K, Galef B G
Department of Psychology, McMaster University, Hamilton, Ontario, Canada.
Behav Neurosci. 1998 Aug;112(4):1026-9. doi: 10.1037//0735-7044.112.4.1026.
When assuming a species-typical tripodal posture, female Mongolian gerbils most often rest on their left forepaws and hold their right forelimbs aloft; male gerbils most often do the reverse. This experiment examined effects of gonadectomy, both in infancy and in adulthood, on the sexually dimorphic asymmetry in forelimb use by Mongolian gerbils when maintaining a tripodal stance. In adulthood, both male and female gerbils that had been gonadectomized at birth reversed their forelimb use while in a tripodal stance: Gonadectomized males used their forelimbs as did sham-operated females, and gonadectomized females used their forelimbs as did sham-operated males. Gonadectomy in adulthood abolished the sexual dimorphism in forelimb use seen in sham-operated subjects. It was concluded that gonadal hormones have organizational as well as possible activational effects on adult patterns of forelimb use by gerbils.
当采取典型的三足姿势时，雌性蒙古沙鼠最常将左前爪放在地上，右前肢向上抬起；而雄性沙鼠的姿势则相反。本实验研究了幼年和成年去势对蒙古沙鼠在保持三足站立姿势时前肢使用的性二态不对称性的影响。成年后，出生时就已去势的雄性和雌性沙鼠在采取三足姿势时都改变了前肢的使用方式：去势雄性的前肢使用方式与假手术雌性相同，去势雌性的前肢使用方式与假手术雄性相同。成年去势消除了假手术动物在前肢使用上的性二态性。研究得出结论，性腺激素对沙鼠成年前肢使用模式具有组织性和可能的激活作用。
