[Process of adaptation in frog auditory system neurons].
The responses of single neurones located in different parts of the auditory system of amphibians to tone signals of a small death of amplitude modulation were studied. It was shown that the firing rate generally diminished during both the first second of sounding (short-term adaptation) and subsequent several tens of seconds (long-term adaptation). In a considerable proportion of neurones, a sharp improving of the phase-locking of the response to modulation waveform was observed in parallel the drop in firing rate. These effects are expressed much more strongly in higher nucleus of the auditory system. A sharp accentuation of modulation waveform could be seen also in the completely adapted regime. In some cases, this effect was evident only after the addition of a random noise to the modulating function (stochastic resonance effect). These data were compared with physiological results obtained on mammals and with psychophysical observations.
Bibikov
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NG
Andreev Acoustic Institute, ul. Shvernika 4, Moscow, 117035 Russia. bibikov@akin.ru
D000222:Adaptation, Physiological; D000818:Animals; D001306:Auditory Pathways / Q000166:cytology / Q000502:physiology*; D001921:Brain / Q000166:cytology / Q000502:physiology; D009474:Neurons / Q000502:physiology*; D011895:Rana ridibunda; D011896:Rana temporaria