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首页> 外文期刊>Journal of Neurophysiology >Linear summation in the barn owl's brainstem underlies responses to interaural time differences
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Linear summation in the barn owl's brainstem underlies responses to interaural time differences

机译：谷仓猫头鹰的线性求和是对腔间时间差异的反应

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摘要

The neurophonic potential is a synchronized frequency-following extracellular field potential that can be recorded in the nucleus laminaris (NL) in the brainstem of the barn owl. Putative generators of the neurophonic are the afferent axons from the nucleus magnocellularis, synapses onto NL neurons, and spikes of NL neurons. The outputs of NL, i.e., action potentials of NL neurons, are only weakly represented in the neurophonic. Instead, the inputs to NL, i.e., afferent axons and their synaptic potentials, are the predominant origin of the neurophonic (Kuokkanen PT, Wagner H, Ashida G, Carr CE, Kempter R. J Neurophysiol 104: 2274-2290, 2010). Thus in NL the monaural inputs from the two brain sides converge and create a binaural neurophonic. If these monaural inputs contribute independently to the extracellular field, the response to binaural stimulation can be predicted from the sum of the responses to ipsi- and contralateral stimulation. We found that a linear summation model explains the dependence of the responses on interaural time difference as measured experimentally with binaural stimulation. The fit between model predictions and data was excellent, even without taking into account the nonlinear responses of NL coincidence detector neurons, although their firing rate and synchrony strongly depend on the interaural time difference. These results are consistent with the view that the afferent axons and their synaptic potentials in NL are the primary origin of the neurophonic.
机译：神经光学潜力是可以在谷仓猫头鹰脑干中的核底层（NL）中的同步频率跟随细胞外场电位。神经电泳的推定发电机是来自核心甲壳四核细胞的传入轴突，在NL神经元上突触，以及NL神经元的尖峰。 NL，即NL神经元的动作电位的输出仅在神经电泳中略微代表。相反，对NL，即传入的轴突及其突触电位的输入是神经电音（Kuokkanen Pt，Wagner H，Ashida G，Carr Ce，Kempter R.J Neurophysiol 104：2274-2290,100）的主要来源。因此，在NL中，来自两个脑侧的单个输入会聚并产生双耳神经电泳。如果这些单声道输入与细胞外场独立贡献，则可以从对对侧刺激的反应的总和预测对双耳刺激的响应。我们发现线性求和模型解释了响应对具有双耳刺激的实验测量的互连时间差的依赖性。模型预测和数据之间的拟合是优异的，即使没有考虑NL符合探测器神经元的非线性响应，尽管它们的烧制率和同步强烈取决于腔内时间差。这些结果与传入轴突及其在NL中的突触电位是神经电泳的主要来源的一致性。

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