Edwards D A, Isaacs S
Department of Psychology, Emory University, Atlanta, GA 30322.
Behav Brain Res. 1991 Aug 29;44(2):145-50. doi: 10.1016/s0166-4328(05)80019-1.
Sexually active males prefer a sexually receptive female to a non-receptive female, and partner-preference tests provide one way of studying the effect of brain damage on sexual motivation. Male rats with bilateral electrolytic lesions of the caudal zona incerta do not mate, and we studied the effects of zona incerta destruction on copulation and partner-preference. Lesioned males did not mate but were not indifferent to sexually receptive females. They continued to show a strong preference for a sexually receptive female over a non-receptive female. In addition, lesioned males showed many incomplete mounts i.e. mounts not accompanied by the pelvic thrusting necessary for intromission and ejaculation. Anogenital investigation of the receptive female was common. Taken together, these facts suggest that zona incerta destruction eliminates copulation without affecting sexual motivation, and that the failure to mate after lesioning probably reflects an inability to properly engage the locomotor responses of copulation.
有性活动的雄性更喜欢性接受期的雌性而非非接受期的雌性，伴侣偏好测试提供了一种研究脑损伤对性动机影响的方法。双侧电解损伤尾侧未定带的雄性大鼠不交配，我们研究了未定带破坏对交配和伴侣偏好的影响。损伤的雄性大鼠不交配，但对性接受期的雌性并非无动于衷。它们仍然表现出对性接受期雌性的强烈偏好，而非非接受期的雌性。此外，损伤的雄性大鼠表现出许多不完整的爬跨行为，即没有伴随插入和射精所需的骨盆推进行为的爬跨。对接受期雌性的肛门生殖器检查很常见。综上所述，这些事实表明，未定带破坏消除了交配行为而不影响性动机，损伤后无法交配可能反映出无法正确启动交配的运动反应。
