Neural coding of sound envelope in reverberant environments

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
Michaël C C Slama, Bertrand Delgutte

Abstract

Speech reception depends critically on temporal modulations in the amplitude envelope of the speech signal. Reverberation encountered in everyday environments can substantially attenuate these modulations. To assess the effect of reverberation on the neural coding of amplitude envelope, we recorded from single units in the inferior colliculus (IC) of unanesthetized rabbit using sinusoidally amplitude modulated (AM) broadband noise stimuli presented in simulated anechoic and reverberant environments. Although reverberation degraded both rate and temporal coding of AM in IC neurons, in most neurons, the degradation in temporal coding was smaller than the AM attenuation in the stimulus. This compensation could largely be accounted for by the compressive shape of the modulation input-output function (MIOF), which describes the nonlinear transformation of modulation depth from acoustic stimuli into neural responses. Additionally, in a subset of neurons, the temporal coding of AM was better for reverberant stimuli than for anechoic stimuli having the same modulation depth at the ear. Using hybrid anechoic stimuli that selectively possess certain properties of reverberant sounds, we show that this reverberant advantage is not caused b...Continue Reading

Citations

Aug 1, 2016·The Journal of the Acoustical Society of America·Pavel Zahorik, Eugene J Brandewie
Oct 31, 2016·Hearing Research·Christian E StilpPavel Zahorik
Nov 12, 2016·Proceedings of the National Academy of Sciences of the United States of America·James Traer, Josh H McDermott
Feb 7, 2018·The European Journal of Neuroscience·Ida SivekeFelix Felmy
Jul 19, 2017·Journal of the Association for Research in Otolaryngology : JARO·Kenneth E HancockBertrand Delgutte
Jun 3, 2018·The Journal of the Acoustical Society of America·Eugene J Brandewie, Pavel Zahorik
Feb 6, 2018·Hearing Research·Richard A FelixChristine V Portfors
Sep 24, 2021·Trends in Hearing·Valentina Zapata-RodriguezJames Harte

❮ Previous
Next ❯

Related Concepts

Related Feeds

Auditory Perception

Auditory perception is the ability to receive and interpret information attained by the ears. Here is the latest research on factors and underlying mechanisms that influence auditory perception.