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New neurons stop growing in a key region of the brain's 'memory center' as early as 13 years old, according to a controversial new study. 一项有争议的新研究显示，早在人类13岁时，大脑“记忆中心”的关键区域，新神经元就已经停止生长了。 Scientists looking at brain tissue samples found no evidence of new nerve cell growth in the dentate gyryus, a part of the hippocampus vital to memory formation, after the age of 13. 研究脑组织样本的科学家没有发现人类在13岁后齿状回（海马区的一个部分）中有新神经细胞生长的证据。海马区对于记忆的形成至关重要。 The discovery contradicts previous findings suggesting that hippocampal neurons replenish themselves throughout adulthood, as they do in many other mammals. 这一发现与之前的研究结果相矛盾，以往的研究显示，人类大脑海马区的神经元在整个成年时期都会不断自我补充，就像它们在其他哺乳动物身上一样。 | 
