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。
New hippocampus neuron development also dwindled over time in macaque monkeys, the scientists found. And hippocampus regeneration was thought to be lacking in big-brained dolphins, porpoises and whales.
科学家们发现,在猕猴身上,新海马神经元的发育也逐渐减少。而海豚和鲸鱼则被认为缺乏海马体的再生。
Writing in the journal Nature, the authors led by Dr Arturo Alvarez-Buylia, from the University of California at San Francisco, concluded: 'Neurogenesis in the dentate gyrus does not continue, or is extremely rare, in adult humans.'
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