發信人：hebb (慈慈, 老公錯了!)    看板：tns
日期：Thu Dec 28 20:49:00 1995
標題：Hebbian rule (海伯法)




Donald Hebb 在 1949 出版的 Organization of Behavior 一書上假設: "When an
axons of cell A is near enough to excite a cell B and repeatedly or
persistently takes part in firingit, some growth process or metabolic
change takes place in one or both cells such that A's efficiency, as one
of the cells firing B, is increased." :

若一神經細胞 A , 足以興奮另一神經細胞 B, 並經常重複地參與 B 細胞的神經衝動,
其一或二細胞產生質的變化, 則 AB 細胞的聯繫的強度因而增強, 最後光憑 A 細胞
的神經衝動便足以激發 B 細胞。

                Hebbian synapse 有三種特性

                1. 時間相近性 (Time-dependent)
                2. 高度區域化 (Highly local)
                3. 有很強交互作用機轉, 突觸前(presynaptic)與突觸後
                   (postsynaptic) 的同時興奮, 可導至突觸聯結的增強。
		   



        


<ORIGIN>: ◎楓城杏話◎bbs.mc.ntu.edu.tw • <FROM>: sunserver.Gener



發信人： neuron (Shun-Sheng Chen)    看板：tns
日期： Fri Dec 29 20:13:12 1995
標題： Re: Hebbian rule (海伯法)


>發信人：hebb (慈慈, 老公錯了!)    看板：tns
>日期：Thu Dec 28 20:49:00 1995
>標題：Hebbian rule (海伯法)
>Donald Hebb 在 1949 出版的 Organization of Behavior 一書上假設: "When an
>axons of cell A is near enough to excite a cell B and repeatedly or
>persistently takes part in firingit, some growth process or metabolic
>change takes place in one or both cells such that A's efficiency, as one
>of the cells firing B, is increased." :
>若一神經細胞 A , 足以興奮另一神經細胞 B, 並經常重複地參與 B 細胞的神經衝動,
>其一或二細胞產生質的變化, 則 AB 細胞的聯繫的強度因而增強, 最後光憑 A 細胞
>的神經衝動便足以激發 B 細胞。
>                Hebbian synapse 有三種特性
>                1. 時間相近性 (Time-dependent)
>                2. 高度區域化 (Highly local)
>                3. 有很強交互作用機轉, 突觸前(presynaptic)與突觸後
>                   (postsynaptic) 的同時興奮,......
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Dear hebb:
    Thank you for tell us the Hebbian rule. I would like to mention another 
Hebb's theory; that is Hebbian theory of intelligence:
    Based on his observations that cerebral injury caused a more diffuse 
disturbance of intellect in children than in adults. The latter tended to
suffer more focal impairment, or else showed little intellectual change, even
with large frontal lesions. Hebb postulated two froms of intelligence: one, 
an innate capacity to form concepts (intelligence A), which determines the
speed and level of intellectual development and which is delayed or impaired 
in a nonspecific way by lesions of many parts of the brain. 
    The second, intelligence B, is the level of intellectual efficiency
actually attained, which, once developed, is relatively little affected by 
cerebral lesions. According to Hebb, the cognitive abilities that are 
seriously impaired by cerebral lesions require an unimpaired brain for their 
optimal performance, i.e. they involve intelligence A. 
    Hope anyone else will tell us the third Hebbian rule!

Reference: Hebb DO: Intelligence, brain function, and the theory of mind.
           Brain 82:260, 1959.

                                                                      neuron
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