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首页> 外文期刊>Animal biology >Spontaneous firing in primary afferent neurons of ampullary electroreceptor organs as attribute of bandwidth, threshold, and topology
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Spontaneous firing in primary afferent neurons of ampullary electroreceptor organs as attribute of bandwidth, threshold, and topology

机译：壶腹部电感受器的初级传入神经元的自发放电是带宽，阈值和拓扑的属性

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摘要

Spontaneous firing(1) of neurons plays an essential part in the detection of sensory Stimuli. Spontaneous firing of primary afferents of ampullary electroreceptor organs in the catfish Ameiurus nebulosus (Lesueur, 1819) was studied in relation to the distribution, thresholds, and frequency characteristics of the electroreceptor organs. The spontaneous firing rate was correlated with the place on the skin. The mean inter-spike interval in 55 dorsal and 49 ventral ampullary organs in five specimens was 16.8 ms +/- 0.41 SEM and 20.5 ms +/- 0.48 SEM, corresponding to firing rates of 59.5 and 48.7 s(-1) respectively. The concomitant coefficients of variation were 0.33 and 0.29. Approximately half of the dorsal ampullae were innervated by two fibres. The firing rates of each of the two fibres was lower than the firing rate of organs innervated by a single neuron. Responses to stimuli as weak as 10 pA could be recovered from the noisy average firing level provided the number of averaging sweeps was sufficiently large. This was equivalent to a Stimulus of 0.025 mu V/cm and was lower than the behavioural threshold of 1 mu V/cm. The gain of the frequency response was enhanced at the carrier frequency, at twice the carrier frequency, and in the range from 75-90 Hz. The results revealed that the occurrence of spontaneous activity improved the signal to noise ratio of responses to electrical stimuli by reduction of the coefficient of variation, absence of a threshold, and phase locking.
机译：神经元的自发放电（1）在感觉刺激的检测中起着至关重要的作用。研究the鱼Ameiurus nebulosus（Lesueur，1819）壶腹电感受器器官的主要传入器官的自发放电与电感受器器官的分布，阈值和频率特性有关。自发放电率与皮肤位置有关。 5个标本中55个背侧和49个腹侧壶腹器官的平均刺突间隔为16.8 ms +/- 0.41 SEM和20.5 ms +/- 0.48 SEM，分别对应于59.5和48.7 s（-1）的发射速率。伴随的变异系数为0.33和0.29。大约一半的壶腹被两个纤维支配。两条纤维中每根的发射率均低于单个神经元支配的器官的发射率。如果平均扫描次数足够多，则可以从嘈杂的平均发射水平恢复对弱至10 pA的刺激的响应。这相当于0.025μV/ cm的刺激，并且低于1μV/ cm的行为阈值。频率响应的增益在载波频率，两倍载波频率和75-90 Hz的范围内得到了增强。结果表明，自发活动的发生通过降低变异系数，不存在阈值和锁相来改善电刺激响应的信噪比。

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