In humans higher oxytocin levels have been linked to physiological phenomena like contractions during childbirth, or orgasm. 在人类，高的催产素水平与一些生理现象有关，比如分娩时的子宫收缩和性高潮时。
But we have yet to discover which genes command the enormously complex chain of physiological events which accompany laughter generation. 们是我们尚未发现，伴随着笑发生的一系列无比复杂的生理现象是由什么基因控制的。
