标题: 原文，why we sleep?【已确认】 [打印本页] 作者: xp1231 时间: 2012-2-13 19:01 标题: 原文，why we sleep?【已确认】 木有弗洛伊德的那篇睡觉，貌似是原文，跟JJ的描述挺像的。
Our need for sleep is somehow tied to our ability to remember. Slumber is known to improve recall in creatures from fruit flies to humans, and the reigning theory among neuroscientists has been that the waves of brain activity during deep sleep reactivate neurons that were triggered during the day, strengthening neuronal connections and cementing them into solid memories. Now Giulio Tononi, a neuroscientist at the University of Wisconsin, says sleep scientists have it all wrong: We don't sleep to remember, we sleep to forget. About 1,000 times a night, billions of neurons undergo a synchronous one-second burst of non-REM electrical activity. The longer a person has been sleep-deprived, the bigger the initial burst. Throughout the night the bursts become progressively smaller, until they finally disappear completely just before waking. Most researchers interpret this activity as the brain slowly reinforcing synaptic connections that already exist, but Tononi noticed that after each wave, the brain goes completely silent, which never happens when we're awake. As we sleep, says Tononi, the brain isn't building but rather downscaling, and these silences between waves play a key role. "Going up and down, up and down, basically all the neurons fire and then all are silent—it's a wonderful way for the brain to tell the synapses to get weaker," Tononi explains. He suspects the progressive weakening allows only the strong connections to survive.
The theory is unorthodox, but it does make a certain amount of sense. Without the ability to pare away unneeded information as we sleep, our brains would face a serious energy shortage as well as a space crunch: Stronger synapses are typically bigger, and real estate in the brain is precious. By proportionally weakening synapses, the brain ensures that they retain the same strength relative to each other. So when we wake up each morning, all of our synapses are weaker, and some have vanished. With them, our smallest memories from each day may be lost forever.作者: sueleo625 时间: 2012-2-13 19:31
楼主您太强大了！！！！作者: Sunnyxu0819 时间: 2012-2-13 19:42
太强了，正好看到这篇机经~作者: neexd 时间: 2012-2-13 19:44
LZ可以把标题改成明天要考的速进，不进后悔。作者: windie 时间: 2012-2-13 20:05
顶作者: orochiaiacos 时间: 2012-2-13 20:18 作者: qiuhua01234567 时间: 2012-2-13 20:22
明天考的痛哭流涕作者: xie8910 时间: 2012-2-13 20:23
球确认！作者: InkingZz 时间: 2012-2-13 22:07
后天考试的抱头痛哭！！！！！！！！！作者: mjshan33 时间: 2012-2-14 09:42
下午考试，谢谢楼主！作者: 4evalove 时间: 2012-2-14 12:05
和寂静39 失眠那个简直一摸一样啊作者: daixiaofei 时间: 2012-2-14 13:13
wow，太强了，顶作者: xie8910 时间: 2012-2-16 21:55
按现在G狗主的说法都说是原文！作者: Alexandra-GMAT 时间: 2024-4-26 13:58
弗洛伊德的梦
