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Binaural hearing

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https://www.readbyqxmd.com/read/28635497/desynchronisation-of-auditory-steady-state-responses-related-to-changes-in-interaural-phase-differences-an-objective-measure-of-binaural-hearing
#1
Charlotte Vercammen, Astrid van Wieringen, Jan Wouters, Tom Francart
OBJECTIVE: Binaural processing can be measured objectively as a desynchronisation of phase-locked neural activity to changes in interaural phase differences (IPDs). This was reported in a magnetoencephalography study for 40 Hz amplitude modulated tones. The goal of this study was to measure this desynchronisation using electroencephalography and explore the outcomes for different modulation frequencies. DESIGN: Auditory steady-state responses (ASSRs) were recorded to pure tones, amplitude modulated at 20, 40 or 80 Hz...
February 14, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28623107/speech-in-noise-perception-in-unilateral-hearing-loss-relation-to-pure-tone-thresholds-and-brainstem-plasticity
#2
Nicolas Vannson, Chris J James, Bernard Fraysse, Boris Lescure, Kuzma Strelnikov, Olivier Deguine, Pascal Barone, Mathieu Marx
We investigated speech recognition in noise in subjects with mild to profound levels of unilateral hearing loss. Thirty-five adults were evaluated using an adaptive signal-to-noise ratio (SNR50) sentence recognition threshold test in three spatial configurations. The results revealed a significant correlation between pure-tone average audiometric thresholds in the poorer ear and SNR thresholds in the two conditions where speech and noise were spatially separated: dichotic - with speech presented to the poorer ear and reverse dichotic - with speech presented to the better ear...
June 13, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28618809/binaural-sensitivity-in-children-who-use-bilateral-cochlear-implants
#3
Erica Ehlers, Matthew J Goupell, Yi Zheng, Shelly P Godar, Ruth Y Litovsky
Children who are deaf and receive bilateral cochlear implants (BiCIs) perform better on spatial hearing tasks using bilateral rather than unilateral inputs; however, they underperform relative to normal-hearing (NH) peers. This gap in performance is multi-factorial, including the inability of speech processors to reliably deliver binaural cues. Although much is known regarding binaural sensitivity of adults with BiCIs, less is known about how the development of binaural sensitivity in children with BiCIs compared to NH children...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28599571/binaural-timing-information-in-electric-hearing-at-low-rates-effects-of-inaccurate-encoding-and-loudness
#4
Katharina Egger, Piotr Majdak, Bernhard Laback
Stimulation strategies for cochlear implants potentially impose timing limitations that may hinder the correct encoding and representation of interaural time differences (ITDs) in realistic bilateral signals. This study aimed to specify the tolerable room for inaccurate encoding of ITDs at low rates by investigating the perceptual degradation due to the removal of individual pulses at various levels of loudness. Unmodulated, 100-pulses-per-second pulse trains were presented at a single, interaurally pitch-matched electrode pair...
May 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28599547/audible-sonar-images-generated-with-proprioception-for-target-analysis
#5
Roman B Kuc
Some blind humans have demonstrated the ability to detect and classify objects with echolocation using palatal clicks. An audible-sonar robot mimics human click emissions, binaural hearing, and head movements to extract interaural time and level differences from target echoes. Targets of various complexity are examined by transverse displacements of the sonar and by target pose rotations that model movements performed by the blind. Controlled sonar movements executed by the robot provide data that model proprioception information available to blind humans for examining targets from various aspects...
May 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28570414/head-shadow-and-binaural-squelch-for-unilaterally-deaf-cochlear-implantees
#6
Joshua G W Bernstein, Gerald I Schuchman, Arnaldo L Rivera
BACKGROUND: Cochlear implants (CIs) can improve speech-in-noise performance for listeners with unilateral sensorineural deafness. But these benefits are modest and in most cases are limited to head-shadow advantages, with little evidence of binaural squelch. HYPOTHESIS: The goal of the investigation was to determine whether CI listeners with normal hearing or moderate hearing loss in the contralateral ear would receive a larger head-shadow benefit for target speech and noise originating from opposite sides of the head, and whether listeners would experience binaural squelch in the free field in a test involving interfering talkers...
May 31, 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28555603/virtual-auditory-space-training-induced-changes-of-auditory-spatial-processing-in-listeners-with-normal-hearing
#7
Kavassery Venkateswaran Nisha, Ajith Uppunda Kumar
OBJECTIVE: Localization involves processing of subtle yet highly enriched monaural and binaural spatial cues. Remediation programs aimed at resolving spatial deficits are surprisingly scanty in literature. The present study is designed to explore the changes that occur in the spatial performance of normal-hearing listeners before and after subjecting them to virtual acoustic space (VAS) training paradigm using behavioral and electrophysiological measures. MATERIALS AND METHODS: Ten normal-hearing listeners participated in the study, which was conducted in three phases, including a pre-training, training, and post-training phase...
April 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/28555602/efficacy-of-directional-microphones-in-hearing-aids-equipped-with-wireless-synchronization-technology
#8
Chinnaraj Geetha, Kishore Tanniru, R Raja Rajan
OBJECTIVE: This study aimed to evaluate the use of directionality in hearing aids with wireless synchronization on localization and speech intelligibility in noise. MATERIALS AND METHODS: This study included 25 individuals with bilateral mild to moderate flat sensorineural hearing loss. For the localization experiment, eight loudspeakers (Genelec 8020B) arranged in a circle covering a 0-360° angle and the Cubase 6 software were used for presenting the stimulus...
April 2017: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/28549773/cochlear-implantation-in-patients-with-otosclerosis-of-the-otic-capsule
#9
Jay Burmeister, Susan Rathgeb, Jacques Herzog
OBJECTIVE: To evaluate outcomes of cochlear implantation of patients with otosclerosis of the otic capsule. STUDY DESIGN: A retrospective case series of 6 patients (7 ears). PATIENTS: 6 patients (7 ears), 5 patients with severe to profound sensorineural hearing loss; 1 patient with mild to profound sensorineural hearing loss, with radiologic evidence of otosclerosis. All patients were adult males, with or without history of stapes surgery...
May 19, 2017: American Journal of Otolaryngology
https://www.readbyqxmd.com/read/28515283/anisomorphic-cortical-reorganization-in-asymmetric-sensorineural-hearing-loss
#10
Steven W Cheung, Craig Anthony Atencio, Eliott R J Levy, Robert C Froemke, Christoph E Schreiner
Acoustic trauma or inner ear disease may predominantly injure one ear, causing asymmetric sensorineural hearing loss (SNHL). While characteristic frequency (CF) map plasticity of primary auditory cortex (AI) contralateral to the injured ear has been detailed, there is no study that also evaluates ipsilateral AI to compare cortical reorganization across both hemispheres. We assess whether normal isomorphic mirror image relationship between the two hemispheres is maintained or disrupted in mild-to-moderate asymmetric SNHL of adult squirrel monkeys...
May 17, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28511103/the-detection-of-virtual-objects-using-echoes-by-humans-spectral-cues
#11
Daniel Rowan, Timos Papadopoulos, Lauren Archer, Amanda Goodhew, Hayley Cozens, Ricardo Guzman Lopez, David Edwards, Hannah Holmes, Robert Allen
Some blind people use echoes to detect discrete, silent objects to support their spatial orientation/navigation, independence, safety and wellbeing. The acoustical features that people use for this are not well understood. Listening to changes in spectral shape due to the presence of an object could be important for object detection and avoidance, especially at short range, although it is currently not known whether it is possible with echolocation-related sounds. Bands of noise were convolved with recordings of binaural impulse responses of objects in an anechoic chamber to create 'virtual objects', which were analysed and played to sighted and blind listeners inexperienced in echolocation...
April 27, 2017: Hearing Research
https://www.readbyqxmd.com/read/28494386/effect-of-efferent-activation-on-binaural-frequency-selectivity
#12
Jesko L Verhey, Monika Kordus, Vit Drga, Ifat Yasin
Binaural notched-noise experiments indicate a reduced frequency selectivity of the binaural system compared to monaural processing. The present study investigates how auditory efferent activation (via the medial olivocochlear system) affects binaural frequency selectivity in normal-hearing listeners. Thresholds were measured for a 1-kHz signal embedded in a diotic notched-noise masker for various notch widths. The signal was either presented in phase (diotic) or in antiphase (dichotic), gated with the noise...
May 2, 2017: Hearing Research
https://www.readbyqxmd.com/read/28464641/extent-of-lateralization-at-large-interaural-time-differences-in-simulated-electric-hearing-and-bilateral-cochlear-implant-users
#13
Regina M Baumgärtel, Hongmei Hu, Birger Kollmeier, Mathias Dietz
Normal-hearing (NH) listeners are able to localize sound sources with extraordinary accuracy through interaural cues, most importantly interaural time differences (ITDs) in the temporal fine structure. Bilateral cochlear implant (CI) users are also able to localize sound sources, yet generally at lower accuracy than NH listeners. The gap in performance can in part be attributed to current CI systems not faithfully transmitting interaural cues, especially ITDs. With the introduction of binaurally linked CI systems, the presentation of ITD cues for bilateral CI users is foreseeable...
April 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28458810/autoimmune-ear-disease-clinical-and-diagnostic-relevance-in-cogan-s-sydrome
#14
Luigi Maiolino, Salvatore Cocuzza, Angelo Conti, Luisa Licciardello, Agostino Serra, Salvatore Gallina
The autoimmune inner ear disease is a clinical syndrome with uncertain pathogenesis that is often associated to rapidly progressive hearing loss that, especially at the early stages of disease, may be at monoaural localization, although more often it is at binaural localization. It usually occurs as a sudden deafness, or a rapidly progressive sensorineural hearing loss. In this study a particular form of autoimmune inner ear disease is described, Cogan's syndrome. Cogan's syndrome is a chronic inflammatory disorder that most commonly affects young adults...
February 1, 2017: Audiology Research
https://www.readbyqxmd.com/read/28456098/intentional-switching-in-auditory-selective-attention-exploring-age-related-effects-in-a-spatial-setup-requiring-speech-perception
#15
Josefa Oberem, Iring Koch, Janina Fels
Using a binaural-listening paradigm, age-related differences in the ability to intentionally switch auditory selective attention between two speakers, defined by their spatial location, were examined. Therefore 40 normal-hearing participants (20 young, Ø 24.8years; 20 older Ø 67.8years) were tested. The spatial reproduction of stimuli was provided by headphones using head-related-transfer-functions of an artificial head. Spoken number words of two speakers were presented simultaneously to participants from two out of eight locations on the horizontal plane...
April 26, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28418327/auditory-and-cognitive-factors-associated-with-speech-in-noise-complaints-following-mild-traumatic-brain-injury
#16
Eric C Hoover, Pamela E Souza, Frederick J Gallun
BACKGROUND: Auditory complaints following mild traumatic brain injury (MTBI) are common, but few studies have addressed the role of auditory temporal processing in speech recognition complaints. PURPOSE: In this study, deficits understanding speech in a background of speech noise following MTBI were evaluated with the goal of comparing the relative contributions of auditory and nonauditory factors. RESEARCH DESIGN: A matched-groups design was used in which a group of listeners with a history of MTBI were compared to a group matched in age and pure-tone thresholds, as well as a control group of young listeners with normal hearing (YNH)...
April 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/28413698/simultaneous-bilateral-cochlear-implants-developmental-advances-do-not-yet-achieve-normal-cortical-processing
#17
Vijayalakshmi Easwar, Hiroshi Yamazaki, Michael Deighton, Blake Papsin, Karen Gordon
BACKGROUND: Simultaneous bilateral cochlear implantation promotes symmetric development of bilateral auditory pathways but binaural hearing remains abnormal. To evaluate whether bilateral cortical processing remains impaired in such children, cortical activity to unilateral and bilateral stimuli was assessed in a unique cohort of 16 children who received bilateral cochlear implants (CIs) simultaneously at 1.97 ± 0.86 years of age and had ~4 years of CI experience, providing the first opportunity to assess electrically driven cortical development in the absence of reorganized asymmetries from sequential implantation...
April 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28395561/acoustic-and-perceptual-effects-of-magnifying-interaural-difference-cues-in-a-simulated-binaural-hearing-aid
#18
Tobias de Taillez, Giso Grimm, Birger Kollmeier, Tobias Neher
OBJECTIVE: To investigate the influence of an algorithm designed to enhance or magnify interaural difference cues on speech signals in noisy, spatially complex conditions using both technical and perceptual measurements. To also investigate the combination of interaural magnification (IM), monaural microphone directionality (DIR), and binaural coherence-based noise reduction (BC). DESIGN: Speech-in-noise stimuli were generated using virtual acoustics. A computational model of binaural hearing was used to analyse the spatial effects of IM...
April 10, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28394906/exploring-binaural-hearing-in-gerbils-meriones-unguiculatus-using-virtual-headphones
#19
Sandra Tolnai, Rainer Beutelmann, Georg M Klump
The Mongolian gerbil (Meriones unguiculatus) has become a key species in investigations of the neural processing of sound localization cues in mammals. While its sound localization has been tested extensively under free-field stimulation, many neurophysiological studies use headphones to present signals with binaural localization cues. The gerbil's behavioral sensitivity to binaural cues, however, is unknown for the lack of appropriate stimulation paradigms in awake behaving gerbils. We close this gap in knowledge by mimicking a headphone stimulation; we use free-field loudspeakers and apply cross-talk cancellation techniques to present pure tones with binaural cues via "virtual headphones" to gerbils trained in a sound localization task...
2017: PloS One
https://www.readbyqxmd.com/read/28377706/cortical-measures-of-binaural-processing-predict-spatial-release-from-masking-performance
#20
Melissa A Papesh, Robert L Folmer, Frederick J Gallun
Binaural sensitivity is an important contributor to the ability to understand speech in adverse acoustical environments such as restaurants and other social gatherings. The ability to accurately report on binaural percepts is not commonly measured, however, as extensive training is required before reliable measures can be obtained. Here, we investigated the use of auditory evoked potentials (AEPs) as a rapid physiological indicator of detection of interaural phase differences (IPDs) by assessing cortical responses to 180° IPDs embedded in amplitude-modulated carrier tones...
2017: Frontiers in Human Neuroscience
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