乡间俗话说“狗不嫌家贫，孩不嫌娘丑”，此言不谬呀。

日本秋田县忠犬八公的故事也是那么的感人。

科学家发现狗的主人和自己的宠物狗间的爱和妈妈对儿女的爱类似，同样的激素信号通路支配着这种充满了魔力的感情。宠物狗看主人的眼神，和妈妈看自己婴儿的类似，它们受相同的激素左右，该结果发表在Science上。

大家都知道狗和人类的关系十分特别，这可能与狗和人漫长的伴随史有关吧。但是什么力量作为纽带维系着狗和人这两种不同物种间如此深厚、密切的感情？研究人员发现狗和主人间眼神交流越多，他们体内oxytocin水平越高，狗和主人都是如此。oxytocin这种东西就是维系人类母性对婴儿温情的激素。而少有眼神交流的宠物狗和主人之间则不会有这种激素变化反应。科学家还发现如果通过鼻喷雾给宠物狗吸入oxytocin的话，宠物狗会花更长的时间用温情脉脉的眼神注视着自己的主人。

很有意思吧，oxytocin维系着母亲对婴儿的爱，oxytocin也已证明维系了夫妻感情；没想到人类和自己的宠物狗之间也是如此。

http://news.sciencemag.org/brain-behavior/2015/04/how-dogs-stole-our-hearts

How dogs stole our hearts

http://www.sciencemag.org/content/348/6232/333

Oxytocin-gaze positive loop and the coevolution of human-dog bonds

Human-like modes of communication, including mutual gaze, in dogs may have been acquired during domestication with humans. We show that gazing behavior from dogs, but not wolves, increased urinary oxytocin concentrations in owners, which consequently facilitated owners’ affiliation and increased oxytocin concentration in dogs. Further, nasally administered oxytocin increased gazing behavior in dogs, which in turn increased urinary oxytocin concentrations in owners. These findings support the existence of an interspecies oxytocin-mediated positive loop facilitated and modulated by gazing, which may have supported the coevolution of human-dog bonding by engaging common modes of communicating social attachment.

群晓生物

http://blog.sina.com.cn/s/blog_7038ff370102vfun.html