Interaural level difference-dependent gain control and synaptic scaling underlying binaural computation.

Interaural level difference-dependent gain control and synaptic scaling underlying binaural computation.
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双耳计算背后的耳间电平差相关增益控制和突触缩放

DOI:
10.1016/j.neuron.2013.06.012
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发表时间:
2013-08-21
期刊:
影响因子:
16.2
通讯作者:
Zhang LI
Zhang LI
中科院分区:
医学1区
文献类型:
--
作者:
Xiong XR;Liang F;Li H;Mesik L;Zhang KK;Polley DB;Tao HW;Xiao Z;Zhang LI

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下丘中央核的双耳整合在声音定位中起着关键作用。然而,其算术性质和潜在的突触机制尚不清楚。在这里,我们在小鼠ICC神经元中发现,对侧优势是由一种类似“推拉”的机制产生的,具有对侧优势兴奋和更多的双边平衡抑制。重要的是,双耳尖峰响应显然是由同侧介导的对侧响应缩放产生的,而频率调谐不变。这种比例效应归因于对侧诱发的突触兴奋对ICC神经元的分裂衰减,其抑制作用基本上不受影响。因此,增益控制调节从单耳到双耳尖峰响应的线性变换。增益值主要是通过调节励磁到不同的电平来调节的。依赖于ild的突触缩放和增益调节允许ICC神经元动态编码耳间声音定位线索,同时保持其他独立声音属性的不变表示。
Binaural integration in the central nucleus of inferior colliculus (ICC) plays a critical role in sound localization. However, its arithmetic nature and underlying synaptic mechanisms remain unclear. Here, we showed in mouse ICC neurons that the contralateral dominance is created by a “push-pull”-like mechanism, with contralaterally dominant excitation and more bilaterally balanced inhibition. Importantly, binaural spiking response is generated apparently from an ipsilaterally-mediated scaling of contralateral response, leaving frequency tuning unchanged. This scaling effect is attributed to a divisive attenuation of contralaterally-evoked synaptic excitation onto ICC neurons with their inhibition largely unaffected. Thus, a gain control mediates the linear transformation from monaural to binaural spike responses. The gain value is modulated by interaural level difference (ILD) primarily through scaling excitation to different levels. The ILD-dependent synaptic scaling and gain adjustment allow ICC neurons to dynamically encode interaural sound localization cues while maintaining an invariant representation of other independent sound attributes.
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