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    8/28/2009

    电生理

    前几天刚做了第一个电生理实验,正在处理数据。

    所谓电生理,就是研究生理放电现象——具体说,就是神经的活动。
    为什么要揭示神经活动呢?是因为神经的活动,体现了智能的计算本质

    而了解了智能的计算本质之后,我们就应该能有机会设计出人造的类似物。

    把神经网络当成电路,我们用一根导体电极靠近单个神经,就可以在胞外(或胞内)测到相应的电位变化。继而根据生理物理学的一些知识,推断出该神经元的状态。


    所幸的是,单个神经元的状态空间相对比较简单。于是用如此朴素的方法,我们就已经可以大概获得一些信息了。然而不幸的是,整个大脑总共有100兆个这样的简单单元。这样的比例已经不能说是“管中窥豹”的尺度了,而应该说是“见一叶落而知岁之将暮”。


    为了捕捉那“一叶落”,我们有时会潜到大脑的深处。

    - 深度?
    - 12540
    - 继续前进100
    - 现在深度12640,发现有响应,开始记录
    - 响应逐渐增强,可能是组织纤维回弹
    - 组织纤维回弹,为避免损伤探头,后退30
    - 原响应消失,前进100
    - 出现两个新的信号源,前进50看能否接近其中一个
    ……


    恰如其分地说,我们就是大海捞针一般地在“脑海”中探寻。
    能否找到大脑在进行人脸识别计算时的线索?
    能否找到那传说中的祖母细胞?
    能否观一叶而知天命?

    现在要给答案,还早。

    Comments (3)

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    Xiaodi Houwrote:
    re王盟:估计你是说Koch搞的Halle Berry cell
    不过在IT我们也发现了identity specific cell。当然,说实话我不信祖母细胞在IT就能出现。
    Aug. 28
    加油~ 等着听新奇的消息
    Aug. 28
    盟 王wrote:
    加油!
    祖母细胞估计在hippocampus区了。
    Aug. 28

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