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标题: 每日科技报告第92期 New Study on Neurons [打印本页]

作者: 张立涛 时间: 2010-9-11 09:55
标题: 每日科技报告第92期 New Study on Neurons

Neurons: Faster Than Thought and Able to Multiply

Using computer simulations of brain-like networks, researchers from Germany and Japan have discovered why nerve cells transmit information through small electrical pulses. The process not only allows the brain to process information much faster than previously thought, but also single neurons are already able to multiply, opening the door to more complex forms of computing.

Researchers have discovered what exactly happens right before a nerve cell emits a pulse: computer simulations reveal that the process is similar to a Japanese garden 'shishi odoshi' -- a reed of bamboo, open on one end, which tilts when a certain amount of rainwater has accumulated inside. (Credit: Image courtesy of Bernstein Center for Computational Neuroscience)

When nerve cells communicate with each other, they do so through electrical pulses -- so-called action potentials. For decades, the accepted idea was that they simply sum up the tiny potentials generated by the incoming pulses and emit an action potential themselves when a threshold is reached. For the first time, Moritz Helias and Markus Diesmann from the RIKEN Brain Science Institute (Japan) and Moritz Deger and Stefan Rotter from the Bernstein Center Freiburg (Germany) now explain what exactly happens right before a nerve cell emits a pulse.

The research appears online in PLoS Computational Biology, published by the Public Library of Science.

The scientists made their discovery through simulations on high performance computers, but found the perfect image for their research subject in the tranquility of Japanese gardens: the 'shishi odoshi', a reed of bamboo, open on one end, which tilts when a certain amount of rainwater has accumulated inside. Just as one tiny raindrop ultimately causes the device to tilt and spill the water, one small electric pulse will cause a neuron to produce an impulse of its own.

Although the neurons in the brain would correspond to a huge forest of bamboo, and the activity sent between them to a thunderstorm of raindrops, Helias and colleagues found a precise mathematical theory that needs to consider the detailed course of events only at the time when a neuron is about to release an action potential.

Not only does this theory explain why nerve cells process information much faster than previously thought. It also became clear that neurons do more than just add up pulses: In the decisive moments, they actually multiply. The availability of this mathematical operation, write the scientists, finally explains how the brain is able to execute complex computations. These insights in the basic processes of the brain will in turn inspire more powerful processor architectures in the future.

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作者: president84 时间: 2010-9-11 15:00
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作者: lizejun77 时间: 2010-9-12 15:01
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作者: jcyou 时间: 2010-9-12 20:00
我基本上是采用看英语文章的办法，先泛读，再精读，再一句一句看，最后再提纲挈领，总算是明白一点了，当然，也可能还是领悟错了。最后要说的一句话是：楼主，你很牛叉，希望你不是真的有病。

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作者: kkly 时间: 2010-9-13 15:00
声明一下：本人看贴和回贴的规则，好贴必看，精华贴必回。

作者: amocilin 时间: 2010-9-13 20:00
强烈支持。楼主万岁

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作者: zgfzx 时间: 2010-9-15 12:00
我基本上是采用看英语文章的办法，先泛读，再精读，再一句一句看，最后再提纲挈领，总算是明白一点了，当然，也可能还是领悟错了。最后要说的一句话是：楼主，你很牛叉，希望你不是真的有病。

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作者: mjw3918 时间: 2010-9-15 20:00
我基本上是采用看英语文章的办法，先泛读，再精读，再一句一句看，最后再提纲挈领，总算是明白一点了，当然，也可能还是领悟错了。最后要说的一句话是：楼主，你很牛叉，希望你不是真的有病。

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作者: nihao 时间: 2010-9-16 15:00
楼主的帖子实在是写得太好了。可是我立刻想到，这么好的帖子，倘若别人看不到，那么不是浪费楼主的心血吗？经过痛苦的思想斗争，我终于下定决心，牺牲小我，奉献大我。我要拿出这帖子奉献给世人赏阅，我要把这个帖子一直往上顶，往上顶！顶到所有人都看到为止！

作者: phoenix007 时间: 2010-9-16 20:00
我来了~~~~~~~~~ 闪人~~~~~~~~~~~~~~~~

作者: 青泽 时间: 2010-9-18 16:31
我基本上是采用看英语文章的办法，先泛读，再精读，再一句一句看，最后再提纲挈领，总算是明白一点了，当然，也可能还是领悟错了。

作者: qbist 时间: 2010-9-18 21:07
看来，我英语还要好好补补~~

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