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https://www.readbyqxmd.com/read/28912440/the-generalization-of-auditory-accommodation-to-altered-spectral-cues
#1
Christopher J G Watson, Simon Carlile, Heather Kelly, Kapilesh Balachandar
The capacity of healthy adult listeners to accommodate to altered spectral cues to the source locations of broadband sounds has now been well documented. In recent years we have demonstrated that the degree and speed of accommodation are improved by using an integrated sensory-motor training protocol under anechoic conditions. Here we demonstrate that the learning which underpins the localization performance gains during the accommodation process using anechoic broadband training stimuli generalize to environmentally relevant scenarios...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28867348/cellular-computations-underlying-detection-of-gaps-in-sounds-and-lateralizing-sound-sources
#2
REVIEW
Donata Oertel, Xiao-Jie Cao, James R Ison, Paul D Allen
In mammals, acoustic information arises in the cochlea and is transmitted to the ventral cochlear nuclei (VCN). Three groups of VCN neurons extract different features from the firing of auditory nerve fibers and convey that information along separate pathways through the brainstem. Two of these pathways process temporal information: octopus cells detect coincident firing among auditory nerve fibers and transmit signals along monaural pathways, and bushy cells sharpen the encoding of fine structure and feed binaural pathways...
August 31, 2017: Trends in Neurosciences
https://www.readbyqxmd.com/read/28863559/modeling-off-frequency-binaural-masking-for-short-and-long-duration-signals
#3
Marc Nitschmann, Ifat Yasin, G Bruce Henning, Jesko L Verhey
Experimental binaural masking-pattern data are presented together with model simulations for 12- and 600-ms signals. The masker was a diotic 11-Hz wide noise centered on 500 Hz. The tonal signal was presented either diotically or dichotically (180° interaural phase difference) with frequencies ranging from 400 to 600 Hz. The results and the modeling agree with previous data and hypotheses; simulations with a binaural model sensitive to monaural modulation cues show that the effect of duration on off-frequency binaural masking-level differences is mainly a result of modulation cues which are only available in the monaural detection of long signals...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28863555/binaural-pitch-fusion-pitch-averaging-and-dominance-in-hearing-impaired-listeners-with-broad-fusion
#4
Yonghee Oh, Lina A J Reiss
Both bimodal cochlear implant and bilateral hearing aid users can exhibit broad binaural pitch fusion, the fusion of dichotically presented tones over a broad range of pitch differences between ears [Reiss, Ito, Eggleston, and Wozny. (2014). J. Assoc. Res. Otolaryngol. 15(2), 235-248; Reiss, Eggleston, Walker, and Oh. (2016). J. Assoc. Res. Otolaryngol. 17(4), 341-356; Reiss, Shayman, Walker, Bennett, Fowler, Hartling, Glickman, Lasarev, and Oh. (2017). J. Acoust. Soc. Am. 143(3), 1909-1920]. Further, the fused binaural pitch is often a weighted average of the different pitches perceived in the two ears...
August 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28846498/benefits-of-incorporating-the-adaptive-dynamic-range-optimization-amplification-scheme-into-an-assistive-listening-device-for-people-with-mild-or-moderate-hearing-loss
#5
Hung-Yue Chang, Ching-Hsing Luo, Tun-Shin Lo, Hsiao-Chuan Chen, Kuo-You Huang, Wen-Huei Liao, Mao-Chang Su, Shu-Yu Liu, Nan-Mai Wang
This study investigated whether a self-designed assistive listening device (ALD) that incorporates an adaptive dynamic range optimization (ADRO) amplification strategy can surpass a commercially available monaurally worn linear ALD, SM100. Both subjective and objective measurements were implemented. Mandarin Hearing-In-Noise Test (MHINT) scores were the objective measurement, whereas participant satisfaction was the subjective measurement. The comparison was performed in a mixed design (i.e., subjects' hearing status being mild or moderate, quiet versus noisy, and linear versus ADRO scheme)...
August 28, 2017: Assistive Technology: the Official Journal of RESNA
https://www.readbyqxmd.com/read/28829840/tone-perception-in-mandarin-speaking-school-age-children-with-otitis-media-with-effusion
#6
Ting Cai, Bradley McPherson, Caiwei Li, Feng Yang
OBJECTIVES: The present study explored tone perception ability in school age Mandarin-speaking children with otitis media with effusion (OME) in noisy listening environments. The study investigated the interaction effects of noise, tone type, age, and hearing status on monaural tone perception, and assessed the application of a hierarchical clustering algorithm for profiling hearing impairment in children with OME. METHODS: Forty-one children with normal hearing and normal middle ear status and 84 children with OME with or without hearing loss participated in this study...
2017: PloS One
https://www.readbyqxmd.com/read/28806706/auditory-cortex-lesions-impair-contralateral-tone-pattern-detection-under-informational-masking
#7
Lisa Prilop, Alexander Gutschalk
Impaired hearing contralateral to unilateral auditory-cortex lesions is typically only observed under conditions of perceptual competition, such as dichotic presentation or speech in noise. It remains unclear, however, if the source of this effect is direct competition in frequency-specific neurons, or if enhanced processing load in more distant frequencies can also impair auditory detection. To evaluate this question, we studied a group of patients with unilateral auditory-cortex lesions (N = 14, six left-hemispheric (LH), eight right-hemispheric (RH); four females; age range 26-72 years) and a control group (N = 25; 15 females; age range 18-76 years) with a target-detection task in presence of a multi-tone masker, which can produce informational masking...
July 19, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28768324/speech-understanding-in-noise-by-patients-with-cochlear-implants-using-a-monaural-adaptive-beamformer
#8
Michael F Dorman, Sarah Natale, Anthony Spahr, Erin Castioni
Purpose: The aim of this experiment was to compare, for patients with cochlear implants (CIs), the improvement for speech understanding in noise provided by a monaural adaptive beamformer and for two interventions that produced bilateral input (i.e., bilateral CIs and hearing preservation [HP] surgery). Method: Speech understanding scores for sentences were obtained for 10 listeners fit with a single CI. The listeners were tested with and without beamformer activated in a "cocktail party" environment with spatially separated target and maskers...
August 16, 2017: Journal of Speech, Language, and Hearing Research: JSLHR
https://www.readbyqxmd.com/read/28723600/detailed-analysis-of-high-frequency-auditory-brainstem-response-in-patients-with-tinnitus-a-preliminary-study
#9
Joseph Pinkl, Matthew J Wilson, Danica Billingsly, Raymundo Munguia-Vazquez
Increased spontaneous activity and aberrant neural synchrony is thought to be the underlying cause of tinnitus. The perceived pitch of tinnitus may be dictated by frequency specific neural fibers of the subcortical pathway, or the projection of altered cortical activity by-way-of tonotopic reorganizations. Subcortical neural activity in relation to tinnitus was characterized using ABR measurements. In the present study, 11 patients (21 ears) with constant tonal tinnitus underwent a two-part experiment. Experiment 1 involved click ABR measurements and included two experimental groups: tinnitus with normal hearing from 2000-4000 Hz (GI) and tinnitus with hearing loss within the range of 2000-4000 Hz (GII)...
June 1, 2017: International Tinnitus Journal
https://www.readbyqxmd.com/read/28701535/enhancement-of-phase-locking-in-rodents-i-an-axonal-recording-study-in-gerbil
#10
Liting Wei, Shotaro Karino, Eric Verschooten, Philip X Joris
The trapezoid body (TB) contains axons of neurons in the anteroventral cochlear nucleus (AVCN) projecting to monaural and binaural nuclei in the superior olivary complex (SOC). Characterization of these monaural inputs is important for the interpretation of response properties of SOC neurons. In particular, understanding of the sensitivity to interaural time differences (ITDs) in neurons of the medial and lateral superior olive (MSO and LSO) requires knowledge of the temporal firing properties of the monaural excitatory and inhibitory inputs to these neurons...
July 12, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28675088/sensitivity-to-angular-and-radial-source-movements-as-a-function-of-acoustic-complexity-in-normal-and-impaired-hearing
#11
Micha Lundbeck, Giso Grimm, Volker Hohmann, Søren Laugesen, Tobias Neher
In contrast to static sounds, spatially dynamic sounds have received little attention in psychoacoustic research so far. This holds true especially for acoustically complex (reverberant, multisource) conditions and impaired hearing. The current study therefore investigated the influence of reverberation and the number of concurrent sound sources on source movement detection in young normal-hearing (YNH) and elderly hearing-impaired (EHI) listeners. A listening environment based on natural environmental sounds was simulated using virtual acoustics and rendered over headphones...
January 2017: Trends in Hearing
https://www.readbyqxmd.com/read/28666702/contralateral-routing-of-signals-disrupts-monaural-level-and-spectral-cues-to-sound-localisation-on-the-horizontal-plane
#12
Adam J Pedley, Pádraig T Kitterick
OBJECTIVES: Contra-lateral routing of signals (CROS) devices re-route sound between the deaf and hearing ears of unilaterally-deaf individuals. This rerouting would be expected to disrupt access to monaural level cues that can support monaural localisation in the horizontal plane. However, such a detrimental effect has not been confirmed by clinical studies of CROS use. The present study aimed to exercise strict experimental control over the availability of monaural cues to localisation in the horizontal plane and the fitting of the CROS device to assess whether signal routing can impair the ability to locate sources of sound and, if so, whether CROS selectively disrupts monaural level or spectral cues to horizontal location, or both...
June 21, 2017: Hearing Research
https://www.readbyqxmd.com/read/28623107/speech-in-noise-perception-in-unilateral-hearing-loss-relation-to-pure-tone-thresholds-and-brainstem-plasticity
#13
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/28618817/an-algorithm-to-increase-intelligibility-for-hearing-impaired-listeners-in-the-presence-of-a-competing-talker
#14
Eric W Healy, Masood Delfarah, Jordan L Vasko, Brittney L Carter, DeLiang Wang
Individuals with hearing impairment have particular difficulty perceptually segregating concurrent voices and understanding a talker in the presence of a competing voice. In contrast, individuals with normal hearing perform this task quite well. This listening situation represents a very different problem for both the human and machine listener, when compared to perceiving speech in other types of background noise. A machine learning algorithm is introduced here to address this listening situation. A deep neural network was trained to estimate the ideal ratio mask for a male target talker in the presence of a female competing talker...
June 2017: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/28618809/binaural-sensitivity-in-children-who-use-bilateral-cochlear-implants
#15
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/28596753/auditory-processing-after-early-left-hemisphere-injury-a-case-report
#16
Cristina Ferraz Borges Murphy, Georgios Stavrinos, Kling Chong, Tony Sirimanna, Doris-Eva Bamiou
Few studies have addressed the long-term outcomes of early brain injury, especially after hemorrhagic stroke. This is the first study to report a case of acquired auditory processing disorder in a 10-year-old child who had a severe left hemorrhagic cerebral infarction at 13 months of age, compromising nearly all of the left temporal lobe. This case, therefore, is an excellent and rare opportunity to investigate the presence of neural plasticity of central auditory system in a developing brain followed severe brain damage...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28576530/maturation-of-auditory-brainstem-responses-in-young-children-with-congenital-monaural-atresia
#17
Konrad Johannes Stuermer, Astrid Foerst, Pascale Sandmann, Dirk Fuerstenberg, Ruth Lang-Roth, Martin Walger
OBJECTIVE: To date, the impact of conductive hearing loss on the auditory pathway at brainstem level has only been investigated in animal studies, which showed a species-specific delay of maturation. In this study, the functional maturation of auditory brainstem response (ABR) parameters in humans with unilateral atresia of the external auditory canal was investigated. METHODS: 42 newborns and toddlers ranging in age from 13 days to 11 months were included. The click-evoked ABR interpeak latencies (IPL) of the atretic ears and the contralateral ears with normal hearing were evaluated...
April 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28560151/auditory-prediction-errors-as-individual-biomarkers-of-schizophrenia
#18
J A Taylor, N Matthews, P T Michie, M J Rosa, M I Garrido
Schizophrenia is a complex psychiatric disorder, typically diagnosed through symptomatic evidence collected through patient interview. We aim to develop an objective biologically-based computational tool which aids diagnosis and relies on accessible imaging technologies such as electroencephalography (EEG). To achieve this, we used machine learning techniques and a combination of paradigms designed to elicit prediction errors or Mismatch Negativity (MMN) responses. MMN, an EEG component elicited by unpredictable changes in sequences of auditory stimuli, has previously been shown to be reduced in people with schizophrenia and this is arguably one of the most reproducible neurophysiological markers of schizophrenia...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28559383/spatial-processing-is-frequency-specific-in-auditory-cortex-but-not-in-the-midbrain
#19
Joseph Sollini, Robert Mill, Christian J Sumner
The cochlea behaves like a bank of band-pass filters, segregating information into different frequency channels. Some aspects of perception reflect processing within individual channels, but others involve the integration of information across them. One instance of this is sound localization, which improves with increasing bandwidth. The processing of binaural cues for sound location has been studied extensively. However, although the advantage conferred by bandwidth is clear, we currently know little about how this additional information is combined to form our percept of space...
July 5, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28555603/virtual-auditory-space-training-induced-changes-of-auditory-spatial-processing-in-listeners-with-normal-hearing
#20
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
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