镜子测试是动物认知的经典测试,通过测试动物能不能认出镜子里的自己,来判断它们是否具有自我识别的能力。在一项新研究里,研究者在黑色小鼠的头上涂上白墨水,结果相比于没有白色标记的小鼠,白墨水小鼠会花更多时间在镜子前梳理自己的头部,试图抹掉头上的白墨水。这说明它们明白,镜子里那个被白墨水染了头顶的小鼠就是自己。黑毛小老鼠的头顶被染了白墨水但是,老鼠得在某些条件下才能通过镜子测试。首先,要是头顶的墨水印不够明显,比如在黑毛小鼠头上涂黑色墨水,或者白色墨水印面积太小,它们并不会察觉自己的外表发生了变化。另外,老鼠需要有和同类一起生活的社会经验,才能有镜像自我识别能力。如果它们断奶后就不跟同类生活在一起,或者一只黑毛小鼠生活在一群白毛小鼠中,它们并不能认出镜子里的自己——毕竟和一群长得跟自己差不多的同伴一起生活过,才能知道自己大概长啥样。通过进一步的研究,科学家发现,每当小老鼠认出了镜子中的自己,它们海马体的一些神经元就会被激活。这些神经元负责小鼠的自我识别,一旦科学家们让它们失去功能,小鼠就认不出镜子里的自己了,也不会做出清理墨水印的动作。
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