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      "body": "在古希腊神话中，有一位名为墨涅莫辛涅（Mnemosyune）的女神，是十二泰坦神之一，掌管记忆。这位女神有九个美丽的女儿，专司文艺与科学，也是就我们现在常常提到的缪斯女神。古希腊人是把记忆当作文艺与科学之母来看的，没有记忆，就没有文艺和科学。\n\n \n\n同时，古希腊人也对“能记住事情”感到疑惑。记忆是怎样产生的呢？哲学家柏拉图是这样认为的：大脑对事物留下印象的方式应当与尖锐物体在蜡版上留下划痕一样，印象一旦形成，那么直到被磨平为止便会一直存在；被磨平之后，出现的新的光滑的表面则是记忆的对立面，也就是完全的遗忘。\n\n这段话与现代神经科学的发现时隔千百年，但虽不中亦不远矣。我们大脑中确实存在一块“蜡版”，或者更像是老师讲课时用的一块黑板。从外界获知的新记忆就像是老师的板书，记录在黑板上，要将这些记忆转化为持久的记忆，就需要我们把板书从黑板上摘抄到笔记本上。自然，脑中的“黑板”也和真正的黑板一样，是有大小限制的，写满了就要擦掉旧的，才能为新的挪出空间。\n\n \n\n这块黑板叫做海马，板书是神经元突触的连接，擦掉一切的则是令人沉醉的黑甜乡——睡眠。\n\n \n\n在清醒的时候，大脑突触之间连接往往是被增强的，这就需要在睡眠期间进行负向调控，不过睡眠对突触可塑性的具体影响尚且不清楚。近期，发表在顶级期刊《科学》上的一篇研究为我们揭开了睡眠与记忆之间的神秘关系。\n\n\n\n来自日本东京大学的池谷裕二（Yuji Ikegaya）和RIKEN脑科学研究所的藤泽茂义（Shigeyoshi Fujisawa）团队合作发现，在睡眠的主要状态、慢波状态下，一种名为尖波涟漪（sharp-wave ripples，SWR）的特殊脑电波正是突触负调控的关键。特异性沉默尖波涟漪阻止了突触的自发下调，并阻碍了新记忆的学习！",
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