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Some features of the sound-signal envelope extracted by cochlear nucleus neurons in grass frog

Content Provider	Springer Nature Link
Author	Bibikov, N. G.
Copyright Year	2015
Abstract	The responses of single neurons in the medullar auditory center of the grass frog were recorded extracellularly under the action of long tone signals of a characteristic frequency that were modulated by repeating fragments of low-frequency (0–15, 0–50 or 0–150 Hz) noise. The correlation method was used for evaluating the strength of the effect of different envelope fragments to ensure the generation of a neuron pulse discharge. While carrying out these evaluations at different time intervals, the maximum delays were assessed between a signal and a response. Two important envelope fragments were revealed. In the majority of units the most effective fragment was the time interval of the amplitude increase from the mean value to the maximum; the fragment where the amplitude fell from the maximum to the mean value was the second in the strength of the effect. This type of response was observed in the vast majority of cells in the range of the envelope frequency bands 0–150 and 0–50 Hz. These cells performed half-wave rectification of this type of envelope. However, in some neurons we observed a stronger strength of the reaction toward a time interval with a increasing amplitude, even including those where the amplitude value was smaller than the mean one. These properties were observed mainly for low-frequency (0–15 Hz) modulated signals at high modulation depth. The data show that even in the medulla oblongata specialization of neural elements of the auditory pathway occurs with respect to the time interval features of the sound stimulus. This diversity is most evident for signals with relatively slowly varying amplitudes.
Starting Page	409
Ending Page	419
Page Count	11
File Format	PDF
ISSN	00063509
Journal	Biophysics
Volume Number	60
Issue Number	3
e-ISSN	15556654
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-08-15
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	auditory system amplitude modulation time interval features envelope detection the rate of amplitude growth amphibian adaptation Biophysics and Biological Physics
Content Type	Text
Resource Type	Article
Subject	Biophysics

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