Mallick H N, Tandon S, Jagannathan N R, Gulia K K, Kumar V M
Department of Physiology, All India Institute of Medical Sciences, New Delhi, India.
Indian J Physiol Pharmacol. 2007 Jan-Mar;51(1):81-5.
Brain mechanisms for the refractory period that characteristically follows ejaculation in animals and human are poorly understood. The possibility of active inhibition of brain areas being responsible for the post-ejaculatory inhibitory state has not been ruled out. Using Blood Oxygen Level Dependent (BOLD) functional magnetic resonance imaging (fMRI) we have mapped brain areas in healthy young volunteers immediately after ejaculation. Functional imaging of the brain for 30 minutes beginning after three minutes of ejaculation induced by masturbation showed spatio-temporal activation in amygdala, temporal lobes and septal areas. The septal areas were observed to be active for a shorter duration than the amygdala and the temporal lobe. Thus the temporal sequence of involvement of the above neural structures may contribute to temporary inhibition of sexual arousal/penile erection during the post-ejaculatory refractory period in humans.
动物和人类射精后特有的不应期的脑机制尚不清楚。大脑区域主动抑制导致射精后抑制状态的可能性尚未排除。我们利用血氧水平依赖（BOLD）功能磁共振成像（fMRI）对健康年轻志愿者射精后立即的脑区进行了定位。在手淫诱导射精三分钟后开始对大脑进行30分钟的功能成像，结果显示杏仁核、颞叶和隔区出现了时空激活。观察到隔区的活跃持续时间比杏仁核和颞叶短。因此，上述神经结构参与的时间顺序可能有助于人类射精后不应期内对性唤起/阴茎勃起的暂时抑制。
