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Science Newsletter of the Faculty fo Physics
This is a new bulletin, which, as we hope, will bring fresh, updated information on scientific news, research activities, and related events in the life of our department to our staff members, undegraduate and graduate students, postdocs, collaborators and partners. We greatly hope that this Science Newsletter will help us to find new partners in research and shorten the way from fundamental research to applications and innovations, from our fundamental discoveries to their successful implementations in not too distant future.
XIV National School-Seminar "Wave phenomena in inhomogeneous media"
The conference papers from the School-Seminar «Waves-2014» will be submitted for publishing in the Memoirs of the Faculty of Physics journal.
| Journals » Memoirs of the Faculty of Physics » Issues » 2014 » # 5 |
Peripheral basis of auditory discrimination of changes in the intensity of pulsed sounds presented in silence and after noise exposure
Liudmila Rimskaya-Korsakova
N.N. Andreev Acoustics Institute, 4 Shvernika St. 117036 Moscow, RussiaCauses of deterioration and facilitation of discrimination of changes in the intensity of short high-frequency sounds (pulses) presented in silence, with noise, and after noise exposure were analysed by comparing the results of simulation and psychoacoustic experiments. In the simulation experiments we studied the characteristics of peripheral coding of changes in the intensity of pulses; searched for the conditions when the response of the ensemble can store information about the amplitude-temporal structure (conditions for the implementation of the volley principle); and analysed the statistical characteristics of responses of the ensemble of auditory nerve fibres (ANF) to pulse and composite sound containing long noise masker and pulse (“noise–pulse complex”). Coding should be understood as the conversion from the analogous receptor potential of the inner hair cell to the sequence of action potentials (spikes) generated by the ensemble of ANFs. Simulation experiments have shown that changes in masker level may cause changes in the properties of peripheral coding of both pulse and noise–pulse complex. Auditory experiments have shown that an appreciable effect of discrimination improvement occurs when the average intensity pulse is presented along with or after the noise masker, the level of which is almost equivalent to the threshold of pulse masking. Furthermore if the delay between pulse and end of masker is 50–60 ms, increase in the masker level causes alternation of the effects of deterioration and facilitation of discrimination of changes in the pulse intensity. There are grounds for believing that the observed effects are based on the variability of properties of the peripheral coding of both pulses and noise–pulse complexes.
| URL: | http://uzmu.phys.sunmarket.com/abstract/2014/5/145350 |
| PACS: | 43.64.+r Physiological acoustics 43.66.+y Psychological acoustics 43.66.Fe Discrimination: intensity and frequency 43.66.Dc Masking |
| UDC: | 534.75 |
| Цитата: | Л.К. Римская-Корсакова. Периферические основы слухового распознавания изменений интенсивности импульсных звуков, предъявляемых в тишине и после воздействия шума // Учен. зап. физ. фак-та Моск. ун-та. 2014. № 5. 145350 |