人类大脑记忆中心在13岁时就停止生长
<p><span word="New">New</span> <span word="neurons">neurons</span> <span word="stop">stop</span> <span word="growing">growing</span> <span word="in">in</span> <span word="a">a</span> <span word="key">key</span> <span word="region">region</span> <span word="of">of</span> <span word="the">the</span> <span word="brain">brain</span>'<span word="s">s</span> '<span word="memory">memory</span> <span word="center">center</span>' <span word="as">as</span> <span word="early">early</span> <span word="as">as</span> 13 <span word="years">years</span> <span word="old">old</span>, <span word="according">according</span> <span word="to">to</span> <span word="a">a</span> <span word="controversial">controversial</span> <span word="new">new</span> <span word="study">study</span>.</p><p>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。</p><p><span word="Scientists">Scientists</span> <span word="looking">looking</span> <span word="at">at</span> <span word="brain">brain</span> <span word="tissue">tissue</span> <span word="samples">samples</span> <span word="found">found</span> <span word="no">no</span> <span word="evidence">evidence</span> <span word="of">of</span> <span word="new">new</span> <span word="nerve">nerve</span> <span word="cell">cell</span> <span word="growth">growth</span> <span word="in">in</span> <span word="the">the</span> <span word="dentate">dentate</span> <span word="gyryus">gyryus</span>, <span word="a">a</span> <span word="part">part</span> <span word="of">of</span> <span word="the">the</span> <span word="hippocampus">hippocampus</span> <span word="vital">vital</span> <span word="to">to</span> <span word="memory">memory</span> <span word="formation">formation</span>, <span word="after">after</span> <span word="the">the</span> <span word="age">age</span> <span word="of">of</span> 13.</p><p>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。</p><p><span word="The">The</span> <span word="discovery">discovery</span> <span word="contradicts">contradicts</span> <span word="previous">previous</span> <span word="findings">findings</span> <span word="suggesting">suggesting</span> <span word="that">that</span> <span word="hippocampal">hippocampal</span> <span word="neurons">neurons</span> <span word="replenish">replenish</span> <span word="themselves">themselves</span> <span word="throughout">throughout</span> <span word="adulthood">adulthood</span>, <span word="as">as</span> <span word="they">they</span> <span word="do">do</span> <span word="in">in</span> <span word="many">many</span> <span word="other">other</span> <span word="mammals">mammals</span>.</p><p>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。</p>
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