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Binaural hearing

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https://www.readbyqxmd.com/read/28515283/anisomorphic-cortical-reorganization-in-asymmetric-sensorineural-hearing-loss
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
https://www.readbyqxmd.com/read/28375876/cochlear-implantation-in-cases-of-unilateral-hearing-loss-initial-localization-abilities
#12
Margaret T Dillon, Emily Buss, Meredith L Anderson, English R King, Ellen J Deres, Craig A Buchman, Kevin D Brown, Harold C Pillsbury
OBJECTIVES: The present study evaluated early auditory localization abilities of cochlear implant (CI) recipients with normal or near-normal hearing (NH) in the contralateral ear. The goal of the study was to better understand the effect of CI listening experience on localization in this population. DESIGN: Twenty participants with unilateral hearing loss enrolled in a prospective clinical trial assessing outcomes of cochlear implantation (ClinicalTrials.gov Identifier: NCT02203305)...
April 3, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28372072/differences-in-the-temporal-course-of-interaural-time-difference-sensitivity-between-acoustic-and-electric-hearing-in-amplitude-modulated-stimuli
#13
Hongmei Hu, Stephan D Ewert, David McAlpine, Mathias Dietz
Previous studies have shown that normal-hearing (NH) listeners' spatial perception of non-stationary interaural time differences (ITDs) is dominated by the carrier ITD during rising amplitude segments. Here, ITD sensitivity throughout the amplitude-modulation cycle in NH listeners and bilateral cochlear implant (CI) subjects is compared, the latter by means of direct stimulation of a single electrode pair. The data indicate that, while NH listeners are most sensitive to ITDs applied toward the beginning of a modulation cycle at 600 Hz, NH listeners at 200 Hz and especially bilateral CI subjects at 200 pulses per second (pps) are more sensitive to ITDs applied to the modulation maximum...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28372056/binaural-pitch-fusion-comparison-of-normal-hearing-and-hearing-impaired-listeners
#14
Lina A J Reiss, Corey S Shayman, Emily P Walker, Keri O Bennett, Jennifer R Fowler, Curtis L Hartling, Bess Glickman, Michael R Lasarev, Yonghee Oh
Binaural pitch fusion is the fusion of dichotically presented tones that evoke different pitches between the ears. In normal-hearing (NH) listeners, the frequency range over which binaural pitch fusion occurs is usually <0.2 octaves. Recently, broad fusion ranges of 1-4 octaves were demonstrated in bimodal cochlear implant users. In the current study, it was hypothesized that hearing aid (HA) users would also exhibit broad fusion. Fusion ranges were measured in both NH and hearing-impaired (HI) listeners with hearing losses ranging from mild-moderate to severe-profound, and relationships of fusion range with demographic factors and with diplacusis were examined...
March 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28358747/binaural-interaction-effects-of-30-50-hz-auditory-steady-state-responses
#15
Robin Gransier, Astrid van Wieringen, Jan Wouters
OBJECTIVES: Auditory stimuli modulated by modulation frequencies within the 30 to 50 Hz region evoke auditory steady state responses (ASSRs) with high signal to noise ratios in adults, and can be used to determine the frequency-specific hearing thresholds of adults who are unable to give behavioral feedback reliably. To measure ASSRs as efficiently as possible a multiple stimulus paradigm can be used, stimulating both ears simultaneously. The response strength of 30 to 50Hz ASSRs is, however, affected when both ears are stimulated simultaneously...
March 29, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28353521/consequences-of-early-conductive-hearing-loss-on-long-term-binaural-processing
#16
Kelley Graydon, Gary Rance, Richard Dowell, Bram Van Dun
OBJECTIVES: The aim of the study was to investigate the long-term effects of early conductive hearing loss on binaural processing in school-age children. DESIGN: One hundred and eighteen children participated in the study, 82 children with a documented history of conductive hearing loss associated with otitis media and 36 controls who had documented histories showing no evidence of otitis media or conductive hearing loss. All children were demonstrated to have normal-hearing acuity and middle ear function at the time of assessment...
March 28, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28301390/pre-and-postoperative-binaural-unmasking-for-bimodal-cochlear-implant-listeners
#17
Benjamin M Sheffield, Gerald Schuchman, Joshua G W Bernstein
OBJECTIVES: Cochlear implants (CIs) are increasingly recommended to individuals with residual bilateral acoustic hearing. Although new hearing-preserving electrode designs and surgical approaches show great promise, CI recipients are still at risk to lose acoustic hearing in the implanted ear, which could prevent the ability to take advantage of binaural unmasking to aid speech recognition in noise. This study examined the tradeoff between the benefits of a CI for speech understanding in noise and the potential loss of binaural unmasking for CI recipients with some bilateral preoperative acoustic hearing...
March 15, 2017: Ear and Hearing
https://www.readbyqxmd.com/read/28301272/speech-recognition-in-bilaterally-cochlear-implanted-adults-in-tokyo-japan
#18
Yoko Ohta, Atsushi Kawano, Sachie Kawaguchi, Kyoko Shirai, Kiyoaki Tsukahara
INTRODUCTION: The clinical effects of bilateral cochlear implantation (BCI) include binaural summation and better hearing under noise conditions. This study retrospectively examined the utility of BCI compared to unilateral cochlear implantation (CI) in adults. PATIENTS AND METHODS: We investigated 34 adults who underwent BCI, comparing speech recognition between BCI and first CI under silent and noise conditions. We assessed correlations between speech recognition after first and second CIs, and between the interval from first to second CI surgery and speech recognition of second CI...
March 16, 2017: Acta Oto-laryngologica
https://www.readbyqxmd.com/read/28288475/cochlear-implantation-in-children-with-congenital-single-sided-deafness
#19
Jan Peter Thomas, Katrin Neumann, Stefan Dazert, Christiane Voelter
OBJECTIVE: To determine audiological and clinical results of cochlear implantation in children with congenital single sided deafness (SSD), with an emphasis on children implanted before and after 6 years of age. STUDY DESIGN: Retrospective study. SETTING: Tertiary referral center. SUBJECTS: Twenty one children with congenital SSD who were implanted aged 10 months to 11;3 years. INTERVENTION: Unilateral cochlear implantation...
April 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28286233/speech-intelligibility-and-subjective-benefit-in-single-sided-deaf-adults-after-cochlear-implantation
#20
Mareike Finke, Angelika Strauß-Schier, Eugen Kludt, Andreas Büchner, Angelika Illg
Treatment with cochlear implants (CIs) in single-sided deaf individuals started less than a decade ago. CIs can successfully reduce incapacitating tinnitus on the deaf ear and allow, so some extent, the restoration of binaural hearing. Until now, systematic evaluations of subjective CI benefit in post-lingually single-sided deaf individuals and analyses of speech intelligibility outcome for the CI in isolation have been lacking. For the prospective part of this study, the Bern Benefit in Single-Sided Deafness Questionnaire (BBSS) was administered to 48 single-sided deaf CI users to evaluate the subjectively perceived CI benefit across different listening situations...
May 2017: Hearing Research
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