But our sexual desire is also fueled by internal stimuli.

但我们的性欲也受到内部刺激的推动。

These pathways typically start with an internal stimulus — often coming from the hypothalamus or pituitary gland — and end in the target glands that release hormones into the blood, to get the real work of living done.

这些途径通常始于内部刺激——通常来自下丘脑或垂体——并以向血液中释放激素的靶腺结束，以完成真正的生活工作。

Some researchers think that overly responsive dopamine systems might magnify brain activity in some way, perhaps creating hallucinations and other so-called positive symptoms as the brain loses its capacity to tell the difference between internal and external stimuli.

一些研究人员认为，过度反应的多巴胺系统可能会以某种方式放大大脑活动，当大脑失去区分内部和外部刺激的能力时，可能会产生幻觉和其他所谓的阳性症状。