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Temporal hyper-precision of brainstem neurons alters spatial sensitivity of binaural auditory processing with cochlear implants.
Front Neurosci
January 2023
Graduate School of Systemic Neurosciences, Ludwig-Maximilians-Universität, Munich, Germany.
The ability to localize a sound source in complex environments is essential for communication and navigation. Spatial hearing relies predominantly on the comparison of differences in the arrival time of sound between the two ears, the interaural time differences (ITDs). Hearing impairments are highly detrimental to sound localization.
View Article and Find Full Text PDFModelling binaural unmasking and the intelligibility of speech in noise and reverberation for normal-hearing and hearing-impaired listeners.
J Acoust Soc Am
November 2021
Univ. Lyon, ENTPE, Laboratoire de Tribologie et Dynamique des Systèmes UMR 5513, Rue M. Audin, 69518 Vaulx-en-Velin Cedex, France.
This study investigated the effect of hearing loss on binaural unmasking (BU) for the intelligibility of speech in noise. Speech reception thresholds (SRTs) were measured with normal-hearing (NH) listeners and older mildly hearing-impaired (HI) listeners while varying the presentation level of the stimuli, reverberation, modulation of the noise masker, and spatial separation of the speech and noise sources. On average across conditions, the NH listeners benefited more (by 0.
View Article and Find Full Text PDFRemote measurement of spectral weighting in sound localization using virtual reality headsets.
Proc Meet Acoust
November 2021
Center for Hearing Research, Boys Town National Research Hospital, Omaha, NE.
Unequal weighting of binaural information across frequency can reduce sensitivity in the presence of competing but uninformative cues ("binaural interference"), a potentially serious problem for listeners who use combined electric and acoustic (EAS) hearing. Here, we used virtual-reality techniques to measure spectral weighting functions (SWF) during localization of simulated EAS stimuli [see van Ginkel et al., 2019, JASA 145, 2445-52]: low-frequency "acoustic" noise bands and high-frequency "electric" click trains.
View Article and Find Full Text PDFTemporal quantization deteriorates the discrimination of interaural time differences.
J Acoust Soc Am
August 2020
Experimental Oto-rhino-laryngology, Department of Neurosciences, Katholieke Universiteit (KU) Leuven-University of Leuven, Herestraat 49 bus 721, Leuven, 3000, Belgium.
Cochlear implants (CIs) often replace acoustic temporal fine structure by a fixed-rate pulse train. If the pulse timing is arbitrary (that is, not based on the phase information of the acoustic signal), temporal information is quantized by the pulse period. This temporal quantization is probably imperceptible with current clinical devices.
View Article and Find Full Text PDFKv3.1 and Kv3.3 subunits differentially contribute to Kv3 channels and action potential repolarization in principal neurons of the auditory brainstem.
J Physiol
June 2020
Auditory Neurophysiology Laboratory, Department of Neuroscience, Psychology & Behaviour, College of Life Sciences, University of Leicester, Leicester, LE1 7RH, UK.
Key Points: Kv3.1 and Kv3.3 subunits are highly expressed in the auditory brainstem, with little or no mRNA for Kv3.
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