Bibikov N G
N.N. Andreev Acoustical Institute, 117036, Moscow, Shvernik st. 4, Russian Federation.
IBRO Rep. 2017 Mar 21;2:54-62. doi: 10.1016/j.ibror.2017.03.003. eCollection 2017 Jun.
Statistical characteristics of background firing in the midbrain auditory units of grass frog () located in torus semicircular (TS) were investigated. Only about 5% of the cells demonstrated prominent spontaneous firing. For such units the following characteristics were obtained: the distribution of interpulse intervals, the autocorrelation functions (ACF) for the real firing process and for the process with shuffled intervals, the hazard function (HF) and the joint distribution of adjacent interpulse intervals. The burstiness of firing was also estimated. In the absolute majority of the cells, the background firing demonstrated considerable deviation from the renewal process. There was weak but significant positive correlation between adjacent interpulse intervals. The burstiness of firing in the midbrain auditory units was moderate but higher than reported for medullary auditory neurons. The value of burstiness did not decrease after interval shuffling. Along with the reduction in excitability (generalized refractoriness) in many neurons observed post-spike facilitation effects were observed. Comparing background activity in medullary and midbrain nucleus suggests that there is an increase in complexity of the information processing along the auditory pathway.
研究了位于半圆隆凸（TS）的草蛙中脑听觉单元背景放电的统计特征。只有约5%的细胞表现出显著的自发放电。对于这些单元，获得了以下特征：脉冲间隔分布、实际放电过程和间隔打乱后的过程的自相关函数（ACF）、危险函数（HF）以及相邻脉冲间隔的联合分布。还估计了放电的阵发性。在绝大多数细胞中，背景放电表现出与更新过程有相当大的偏差。相邻脉冲间隔之间存在微弱但显著的正相关。中脑听觉单元放电的阵发性适中，但高于髓质听觉神经元的报道。间隔打乱后，阵发性的值并未降低。除了许多神经元中观察到的兴奋性降低（广义不应期）外，还观察到了峰后易化效应。比较髓质和中脑核的背景活动表明，沿听觉通路信息处理的复杂性增加。
