Reverse-Hebb plasticity leads to optimization and association in a simulated visual cortex.
Reverse-Hebb plasticity leads to optimization and association in a simulated visual cortex.
复制标题
逆赫布可塑性导致模拟视觉皮层的优化和关联。
DOI：
10.1017/s0952523800001358
复制
发表时间：
1991
影响因子：
1.9
通讯作者：
Soodak,RE
中科院分区：
文献类型：
--
作者：
Soodak,RE
研究了可变时相突触修饰规则对模拟视皮层经验依赖性发育的影响。令人感兴趣的是内部表征相对于方向的优化过程，通过这个过程，视觉经验不足的动物的弱调谐神经元获得了它们紧密调谐的成年特征，以及联想过程，通过这个过程，向任何一只眼睛提供相同的刺激来唤起相同的皮层表征。一般来说，突触修饰规则是赫布的。然而，并没有假设突触前和突触后活动的正相关会导致突触重量的增加。影响突触重量增加的突触前与突触后活动的相对相位是修改规则的参数。当该参数为零时，突触修饰符合标准的Hebbian型。与180度的值，或反向Hebb条件下，突触前和突触后活动之间的负相关导致突触重量增加。结果发现，逆赫布型的突触修改规则不仅优化了皮层表示，并将两只眼睛的表示相关联，而且在长时间的学习中保持最佳状态是相当稳定的。
The effects of a variable-phase synaptic modification rule on the experience-dependent development of a simulated visual cortex were investigated. Of interest were the process of optimization of the internal representation with respect to orientation, through which the weakly tuned neurons of visually inexperienced animals attain their tightly tuned adult characteristics, and the process of association by which identical stimuli presented to either eye come to evoke identical cortical representations. In its general form, the synaptic modification rule was Hebbian. However, it was not assumed that positive correlation of presynaptic and postsynaptic activity would lead to an increase in synaptic weight. The relative phase of presynaptic vs. postsynaptic activity that would effect an increase in synaptic weight was a parameter of the modification rule. When this parameter was zero, synaptic modification conformed to the standard Hebbian type. With a value of 180 deg, or the reverse-Hebb condition, negative correlation between presynaptic and postsynaptic activity led to increased synaptic weight. It was found that a synaptic modification rule of the reverse-Hebb type not only optimized the cortical representation, and associated the representations from the two eyes, but was quite stable with respect to retaining the optimized state for long periods of learning.