Differential effects of excitatory and inhibitory plasticity on synaptically driven neuronal input-output functions.

Differential effects of excitatory and inhibitory plasticity on synaptically driven neuronal input-output functions.
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兴奋性和抑制性可塑性对突触驱动的神经元输出输出功能的差异影响。

DOI:
10.1016/j.neuron.2009.01.013
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发表时间:
2009-03-12
期刊:
影响因子:
16.2
通讯作者:
Buonomano, Dean V.
Buonomano, Dean V.
中科院分区:
医学1区
文献类型:
--
作者:
Carvalho, Tiago P.;Buonomano, Dean V.

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最终,一个神经元是否产生尖峰决定了它对局部计算的贡献。在对短暂刺激的反应中,神经元放电的概率可以用其输入输出函数来描述,该函数取决于兴奋性和抑制性电流的净平衡和时间。虽然兴奋性和抑制性突触具有可塑性,但大多数研究考察的是阈下事件的可塑性。因此,兴奋性和抑制性突触强度的协同调节对神经元输入输出功能的影响尚不清楚。理论分析表明,兴奋性突触强度控制神经元输入输出功能的阈值,而抑制性可塑性则改变阈值和增益。在实验中,CA1锥体神经元的兴奋和抑制平衡的变化也改变了它们的输入-输出功能,正如模型预测的那样。这些结果支持存在两种可用于优化信息处理的可塑性功能模式:阈值和增益可塑性。
Ultimately, whether or not a neuron produces a spike determines its contribution to local computations. In response to brief stimuli the probability a neuron will fire can be described by its input-output function, which depends on the net balance and timing of excitatory and inhibitory currents. While excitatory and inhibitory synapses are plastic, most studies examine plasticity of subthreshold events. Thus, the effects of concerted regulation of excitatory and inhibitory synaptic strength on neuronal input-output functions are not well understood. Here, theoretical analyses reveal that excitatory synaptic strength controls the threshold of the neuronal input-output function, while inhibitory plasticity alters the threshold and gain. Experimentally, changes in the balance of excitation and inhibition in CA1 pyramidal neurons also altered their input-output function as predicted by the model. These results support the existence of two functional modes of plasticity that can be used to optimize information processing: threshold and gain plasticity.
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