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Binaural hearing

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https://www.readbyqxmd.com/read/29135879/cochlear-implantation-in-children-with-congenital-unilateral-deafness-a-case-series
#1
Rainer Linus Beck, Antje Aschendorff, Frederike Hassepaß, Thomas Wesarg, Stefanie Kröger, Till F Jakob, Susan Arndt
OBJECTIVES: Cochlear implant is regarded as a treatment option for hearing rehabilitation of adults with unilateral sensorineural hearing loss. A clear benefit has been experienced in regard to speech comprehension in noise, localization, and quality of life. The aim of this study was to investigate the benefit of cochlear implantation for children with congenital unilateral hearing loss. STUDY DESIGN: Retrospective case series. SETTING: Tertiary referral center; cochlear implant program...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29135878/single-sided-deafness-impact-of-cochlear-implantation-on-speech-perception-in-complex-noise-and-on-auditory-localization-accuracy
#2
Julia Döge, Uwe Baumann, Tobias Weissgerber, Tobias Rader
OBJECTIVE: To assess auditory localization accuracy and speech reception threshold (SRT) in complex noise conditions in adult patients with acquired single-sided deafness, after intervention with a cochlear implant (CI) in the deaf ear. STUDY DESIGN: Nonrandomized, open, prospective patient series. SETTING: Tertiary referral university hospital. PATIENTS: Eleven patients with late-onset single-sided deafness (SSD) and normal hearing in the unaffected ear, who received a CI...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29135686/cortical-correlates-of-binaural-temporal-processing-deficits-in-older-adults
#3
Ann Clock Eddins, David A Eddins
OBJECTIVES: This study was designed to evaluate binaural temporal processing in young and older adults using a binaural masking level difference (BMLD) paradigm. Using behavioral and electrophysiological measures within the same listeners, a series of stimulus manipulations was used to evaluate the relative contribution of binaural temporal fine-structure and temporal envelope cues. We evaluated the hypotheses that age-related declines in the BMLD task would be more strongly associated with temporal fine-structure than envelope cues and that age-related declines in behavioral measures would be correlated with cortical auditory evoked potential (CAEP) measures...
November 9, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/29130442/outcomes-of-hearing-aid-use-by-individuals-with-unilateral-sensorineural-hearing-loss-usnhl
#4
Charles E Bishop, Elgenaid Hamadain, Jason A Galster, Mary Frances Johnson, Christopher Spankovich, Ian Windmill
BACKGROUND: Unilateral sensorineural hearing loss (USNHL) can have a negative impact on functions associated with the advantages of balanced, binaural hearing. Although single-sided deafness, which is a complete loss of audibility in one ear, has gained increased interest in the published research, there is a gap in the literature concerning hearing aid outcomes for individuals with residual, or otherwise "aidable," hearing in the affected ear. PURPOSE: To assess hearing aid outcomes for a group of individuals with USNHL with residual, aidable function...
November 2017: Journal of the American Academy of Audiology
https://www.readbyqxmd.com/read/29122721/a-common-periodic-representation-of-interaural-time-differences-in-mammalian-cortex
#5
Nelli H Salminen, Simon J Jones, Gestur B Christianson, Torsten Marquardt, David McAlpine
Binaural hearing, the ability to detect small differences in the timing and level of sounds at the two ears, underpins the ability to localize sound sources along the horizontal plane, and is important for decoding complex spatial listening environments into separate objects - a critical factor in 'cocktail-party listening'. For human listeners, the most important spatial cue is the interaural time difference (ITD). Despite many decades of neurophysiological investigations of ITD sensitivity in small mammals, and computational models aimed at accounting for human perception, a lack of concordance between these studies has hampered our understanding of how the human brain represents and processes ITDs...
November 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/29119311/cortical-processing-of-level-cues-for-spatial-hearing-is-impaired-in-children-with-prelingual-deafness-despite-early-bilateral-access-to-sound
#6
Vijayalakshmi Easwar, Hiroshi Yamazaki, Michael Deighton, Blake Papsin, Karen Gordon
Bilateral cochlear implantation aims to restore binaural hearing, important for spatial hearing, to children who are deaf. Improvements over unilateral implant use are attributed largely to the detection of interaural level differences (ILDs) but emerging evidence of impaired sound localization and binaural fusion suggest that these binaural cues are abnormally coded by the auditory system. We used multichannel electroencephalography (EEG) to assess cortical responses to ILDs in two groups: 13 children who received early bilateral cochlear implants (CIs) simultaneously, known to protect the developing auditory cortices from unilaterally driven reorganization, and 15 age matched peers with normal hearing...
November 8, 2017: Brain Topography
https://www.readbyqxmd.com/read/29106867/audio-visual-speech-perception-in-prelingually-deafened-japanese-children-following-sequential-bilateral-cochlear-implantation
#7
Ryosuke Yamamoto, Yasushi Naito, Risa Tona, Saburo Moroto, Rinko Tamaya, Keizo Fujiwara, Shogo Shinohara, Shinji Takebayashi, Masahiro Kikuchi, Tetsuhiko Michida
OBJECTIVES: An effect of audio-visual (AV) integration is observed when the auditory and visual stimuli are incongruent (the McGurk effect). In general, AV integration is helpful especially in subjects wearing hearing aids or cochlear implants (CIs). However, the influence of AV integration on spoken word recognition in individuals with bilateral CIs (Bi-CIs) has not been fully investigated so far. In this study, we investigated AV integration in children with Bi-CIs. METHODS: The study sample included thirty one prelingually deafened children who underwent sequential bilateral cochlear implantation...
November 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29106853/sequential-pediatric-bilateral-cochlear-implantation-the-effect-of-time-interval-between-implants
#8
Giovanni Bianchin, Lorenzo Tribi, Patrizia Formigoni, Carmela Russo, Valeria Polizzi
OBJECTIVE: To examine speech intelligibility in children subjected to sequential bilateral cochlear implants (CI) surgery and to assess the influence of the inter-stage interval duration. INTRODUCTION: Binaural hearing recovery can have additional benefits, especially in speech and language development in patients with congenital profound sensorineural hearing loss; so recently there has been an increase in the number of children receiving bilateral CI. METHODS: Twenty-seven children who underwent sequential bilateral cochlear implant (SBCI) with a short (1-3 yrs), medium (4-6 yrs) and long (7-12 yrs) range interval between both implantations, respectively, were evaluated...
November 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29092558/examination-of-a-hybrid-beamformer-that-preserves-auditory-spatial-cues
#9
Virginia Best, Elin Roverud, Christine R Mason, Gerald Kidd
A hearing-aid strategy that combines a beamforming microphone array in the high frequencies with natural binaural signals in the low frequencies was examined. This strategy attempts to balance the benefits of beamforming (improved signal-to-noise ratio) with the benefits of binaural listening (spatial awareness and location-based segregation). The crossover frequency was varied from 200 to 1200 Hz, and performance was compared to full-spectrum binaural and beamformer conditions. Speech intelligibility in the presence of noise or competing speech was measured in listeners with and without hearing loss...
October 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/29090641/evaluation-of-a-method-for-determining-binaural-sensitivity-to-temporal-fine-structure-tfs-af-test-for-older-listeners-with-normal-and-impaired-low-frequency-hearing
#10
Christian Füllgrabe, Brian C J Moore
The ability to process binaural temporal fine structure (TFS) information was assessed using the TFS-AF test (where AF stands for adaptive frequency) for 26 listeners aged 60 years or more with normal or elevated low-frequency audiometric thresholds. The test estimates the highest frequency at which a fixed interaural phase difference (IPD) of ϕ (varied here between 30° and 180°) can be discriminated from an IPD of 0°, with higher thresholds indicating better performance. A sensation level of 30 dB was used...
January 2017: Trends in Hearing
https://www.readbyqxmd.com/read/29084088/intracochlear-measurements-of-interaural-time-and-level-differences-conveyed-by-bilateral-bone-conduction-systems
#11
Nyssa F Farrell, Renee M Banakis Hartl, Victor Benichoux, Andrew D Brown, Stephen P Cass, Daniel J Tollin
HYPOTHESIS: Intracochlear pressures (PIC) and stapes velocity (Vstap) elicited by bilaterally placed bone-anchored hearing devices (BAHD) will be systematically modulated by imposed interaural time (ITD) and level differences (ILD), demonstrating the potential for users of bilateral BAHD to access these binaural cues. BACKGROUND: BAHD are traditionally implanted unilaterally under the assumption that transcranial cross-talk limits interaural differences. Recent studies have demonstrated improvements in binaural and spatial performance with bilateral BAHD; however, objective measures of binaural cues from bilateral BAHDs are lacking...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29073893/activity-dependent-formation-of-a-vesicular-inhibitory-amino-acid-transporter-gradient-in-the-superior-olivary-complex-of-nmri-mice
#12
Lena Ebbers, Maren Weber, Hans Gerd Nothwang
BACKGROUND: In the mammalian superior olivary complex (SOC), synaptic inhibition contributes to the processing of binaural sound cues important for sound localization. Previous analyses demonstrated a tonotopic gradient for postsynaptic proteins mediating inhibitory neurotransmission in the lateral superior olive (LSO), a major nucleus of the SOC. To probe, whether a presynaptic molecular gradient exists as well, we investigated immunoreactivity against the vesicular inhibitory amino acid transporter (VIAAT) in the mouse auditory brainstem...
October 26, 2017: BMC Neuroscience
https://www.readbyqxmd.com/read/29071340/combined-effects-of-noise-and-reverberation-on-sound-localization-for-listeners-with-normal-hearing-and-bilateral-cochlear-implants
#13
Yunfang Zheng, Janet Koehnke, Joan Besing
Purpose: This study examined the individual and combined effects of noise and reverberation on the ability of listeners with normal hearing (NH) and with bilateral cochlear implants (BCIs) to localize speech. Method: Six adults with BCIs and 10 with NH participated. All subjects completed a virtual localization test in quiet and at 0-, -4-, and -8-dB signal-to-noise ratios (SNRs) in simulated anechoic and reverberant (0.2-, 0.6-, and 0.9-s RT60) environments. BCI users were also tested at +8- and +4-dB SNR...
October 25, 2017: American Journal of Audiology
https://www.readbyqxmd.com/read/29049603/enhancing-auditory-selective-attention-using-a-visually-guided-hearing-aid
#14
Gerald Kidd
Purpose: Listeners with hearing loss, as well as many listeners with clinically normal hearing, often experience great difficulty segregating talkers in a multiple-talker sound field and selectively attending to the desired "target" talker while ignoring the speech from unwanted "masker" talkers and other sources of sound. This listening situation forms the classic "cocktail party problem" described by Cherry (1953) that has received a great deal of study over the past few decades. In this article, a new approach to improving sound source segregation and enhancing auditory selective attention is described...
October 17, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/29049038/binaural-integration-a-challenge-to-overcome-for-children-with-hearing-loss
#15
Karen A Gordon, Sharon L Cushing, Vijayalakshmi Easwar, Melissa J Polonenko, Blake C Papsin
PURPOSE OF REVIEW: Access to bilateral hearing can be provided to children with hearing loss by fitting appropriate hearing devices to each affected ear. It is not clear, however, that bilateral input is properly integrated through hearing devices to promote binaural hearing. In the present review, we examine evidence indicating that abnormal binaural hearing continues to be a challenge for children with hearing loss despite early access to bilateral input. RECENT FINDINGS: Behavioral responses and electrophysiological data in children, combined with data from developing animal models, reveal that deafness in early life disrupts binaural hearing and that present hearing devices are unable to reverse these changes and/or promote expected development...
December 2017: Current Opinion in Otolaryngology & Head and Neck Surgery
https://www.readbyqxmd.com/read/28987787/tonotopic-organisation-of-the-auditory-cortex-in-sloping-sensorineural-hearing-loss
#16
Tomasz Wolak, Katarzyna Cieśla, Artur Lorens, Krzysztof Kochanek, Monika Lewandowska, Mateusz Rusiniak, Agnieszka Pluta, Joanna Wójcik, Henryk Skarżyński
Although the tonotopic organisation of the human primary auditory cortex (PAC) has already been studied, the question how its responses are affected in sensorineural hearing loss remains open. Twenty six patients (aged 38.1 ± 9.1 years; 12 men) with symmetrical sloping sensorineural hearing loss (SNHL) and 32 age- and gender-matched controls (NH) participated in an fMRI study using a sparse protocol. The stimuli were binaural 8s complex tones with central frequencies of 400 HzCF, 800 HzCF, 1600 HzCF, 3200 HzCF, or 6400 HzCF, presented at 80 dB(C)...
September 28, 2017: Hearing Research
https://www.readbyqxmd.com/read/28982139/a-bayesian-computational-basis-for-auditory-selective-attention-using-head-rotation-and-the-interaural-time-difference-cue
#17
Dillon A Hambrook, Marko Ilievski, Mohamad Mosadeghzad, Matthew Tata
The process of resolving mixtures of several sounds into their separate individual streams is known as auditory scene analysis and it remains a challenging task for computational systems. It is well-known that animals use binaural differences in arrival time and intensity at the two ears to find the arrival angle of sounds in the azimuthal plane, and this localization function has sometimes been considered sufficient to enable the un-mixing of complex scenes. However, the ability of such systems to resolve distinct sound sources in both space and frequency remains limited...
2017: PloS One
https://www.readbyqxmd.com/read/28971746/loudness-summation-of-equal-loud-narrowband-signals-in-normal-hearing-and-hearing-impaired-listeners
#18
Stephan D Ewert, Dirk Oetting
OBJECTIVE: Loudness perception of binaural broadband signals, e.g. speech shaped noise, shows large individual differences using frequency-dependent amplification which was adjusted to restore the loudness perception of monaural narrowband signals in hearing-impaired (HI) listeners. To better understand and quantify this highly individual effect, loudness perception of broadband stimuli consisting of a number of spectrally separated narrowband components which where individually adjusted to equal loudness is of interest...
October 3, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/28964069/adaptive-spatial-filtering-improves-speech-reception-in-noise-while-preserving-binaural-cues
#19
Susan R S Bissmeyer, Raymond L Goldsworthy
Hearing loss greatly reduces an individual's ability to comprehend speech in the presence of background noise. Over the past decades, numerous signal-processing algorithms have been developed to improve speech reception in these situations for cochlear implant and hearing aid users. One challenge is to reduce background noise while not introducing interaural distortion that would degrade binaural hearing. The present study evaluates a noise reduction algorithm, referred to as binaural Fennec, that was designed to improve speech reception in background noise while preserving binaural cues...
September 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28964063/localization-performance-correlates-with-binaural-fusion-for-interaurally-mismatched-vocoded-speech
#20
Deepa Suneel, Hannah Staisloff, Corey S Shayman, Julia Stelmach, Justin M Aronoff
Bilateral cochlear implant users often have difficulty fusing sounds from the two ears into a single percept. However, measuring fusion can be difficult, particularly with cochlear implant users who may have no reference for a fully fused percept. As a first step to address this, this study examined how localization performance of normal hearing subjects relates to binaural fusion. The stimuli were vocoded speech tokens with various interaural mismatches. The results reveal that the percentage of stimuli perceived as fused was correlated with localization performance, suggesting that changes in localization performance can serve as an indicator for binaural fusion changes...
September 2017: Journal of the Acoustical Society of America
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