Abstract
The responses of single neurons of the cochlear nucleus of a grass frog to long tonal signals amplitude-modulated by repeat intervals of low-frequency noise have been studied. The carrier frequency always corresponded to the characteristic frequency of the studied cell (a range of 0.2 kHz–2 kHz); the modulated signal was noise in the ranges 0–15 Hz, 0–50 Hz, or 0–150 Hz. We obtained the correlation functions of the cyclic histogram reflecting the change in probability of a neuron pulse discharge (spike) during the modulation period with the shape of the signal envelope in the same period. The form of the obtained correlation functions usually does not change qualitatively with a change in carrier level or modulation depth; however, this could essentially depend of the frequency component of the modulating function. In the majority of cases, comparison of the cyclic histogram of the reaction with only the current amplitude value does not adequately reveal the signal’s time features that determine the reaction of a neuron. The response is also determined by the other sound features, primarily by the rate of the change in amplitude. The studied neurons differed among themselves, both in preference toward a certain range of modulated frequencies and in the features of the envelope that caused the cell’s response.
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Original Russian Text © N.G. Bibikov, 2014, published in Akusticheskii Zhurnal, 2014, Vol. 60, No. 5, pp. 555–566.
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Bibikov, N.G. Correlation of neural responses in the cochlear nucleus with low-frequency noise amplitude modulation of a tonal signal. Acoust. Phys. 60, 597–607 (2014). https://doi.org/10.1134/S1063771014050029
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DOI: https://doi.org/10.1134/S1063771014050029