Spontaneous and sound-evoked single-unit activity was recorded from afferent neurones in the cochlear ganglion of the anaesthetized pigeon. The histogram of successive intervals of spontaneous activity of 51% of neurones exhibited more short intervals than expected from a Poisson point-process description of spike times; for another 43% of neurones the point-process was Poisson. A model of spike generation was developed to account for the concentration of short spike-intervals. The proposed model contains inhibitory postsynaptic potentials at the afferent dendrite, in addition to the excitatory postsynaptic potentials. Not only does the model reproduce the first-order interval statistics of neural activity, but it provides a mechanism for improving phase-locking to the fundamental frequency of a sinusoid, and also offers an explanation for the presence of reciprocal synapses in the human cochlea.

译文

麻醉鸽子的耳蜗神经节中的传入神经元记录了自发和声音诱发的单单位活动。神经元51% 自发活动的连续间隔的直方图显示出比峰值时间的泊松点过程描述所预期的更短的间隔; 对于另一个43% 的神经元,点过程是泊松。建立了尖峰生成模型来说明短尖峰间隔的浓度。提出的模型除了兴奋性突触后电位外,还在传入树突处包含抑制性突触后电位。该模型不仅再现了神经活动的一阶间隔统计,而且提供了一种改善对正弦基本频率的锁相的机制,还提供了对人类耳蜗中存在相互突触的解释。

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