鸡的性别差异以及睾酮对脑不对称性的逆转作用。

Sex differences and reversal of brain asymmetry by testosterone in chickens.

作者信息

Zappia J V, Rogers L J

出版信息

Behav Brain Res. 1987 Mar;23(3):261-7. doi: 10.1016/0166-4328(87)90026-x.

Abstract

The study examined the effect of testosterone on the asymmetry of visual discrimination performance of young chicks. Two-week-old chicks were tested on the pebble floor visual discrimination task. Male chicks were found to have brain asymmetry for visual discrimination learning, since chicks tested binocularly, or tested monocularly using their right eye system, have superior learning performance compared to chicks tested monocularly using their left eye system. Control female chicks were not found to have brain asymmetry. Testosterone treatment (12.5 mg of testosterone oenanthate on day 2 posthatch) reversed the pattern of brain asymmetry observed in control males but not females. In addition, asymmetry of visual discrimination learning is demonstrated in both male and female chicks after unilateral intracranial treatment with monosodium glutamate.

摘要

该研究考察了睾酮对幼雏视觉辨别能力不对称性的影响。对两周大的雏鸡进行了卵石地面视觉辨别任务测试。发现雄性雏鸡在视觉辨别学习方面存在脑不对称性，因为与使用左眼系统单眼测试的雏鸡相比，双眼测试或使用右眼系统单眼测试的雏鸡具有更好的学习表现。未发现对照雌性雏鸡存在脑不对称性。睾酮处理（孵化后第2天注射12.5毫克庚酸睾酮）逆转了对照雄性雏鸡中观察到的脑不对称模式，但对雌性雏鸡没有影响。此外，在用谷氨酸单钠进行单侧颅内处理后，雄性和雌性雏鸡均表现出视觉辨别学习的不对称性。