The psychoacoustics of binaural hearing

Akeroyd, Michael A.

doi:10.1080/14992020600782626

Cited by 109 publications

(88 citation statements)

References 117 publications

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“…Mean data from the normally hearing group is shown in figures 3.3 (ILD) and 3.8 (ITD). Thus, minimum ILD lateralization in normally hearing children is likely near-adult levels (0.5dB HL) (Akeroyd 2006) by 5 years of age. Consistent with this, we found that children with normal hearing had little difficulty completing our lateralization task.…”

Section: Results From Children With Normal Hearingmentioning

confidence: 99%

“…Moreover, evoked potential studies have shown that the deaf and immature auditory brainstem retains the ability to change in response to prolonged stimulation from a single cochlear implant . This ability does not diminish with age at implantation/duration of deafness, suggesting that the auditory brainstem remains plastic in the absence of stimulation during development 2006;Gordon et al 2008;Thai-Van et al 2007). Therefore, while congenital deafness results in degeneration and rearrangement along the auditory system, provision of a single cochlear implant may help to prevent further degradation and also results in some degree of maturation in the auditory brainstem 2006;Gordon et al 2008;Leake et al 2008;Lee et al 2007; Thai- Van et al 2007;Vollmer et al 2005).…”

Section: Figure 14 the External Components Of A Cochlear Implantmentioning

confidence: 99%

“…ILDs are greatest at high frequencies because at frequencies of less than 500Hz, wavelengths become larger than the diameter of a human listener's head, canceling out the effects of the head shadow (Macpherson and Middlebrooks 2002;Schnupp and Carr 2009). Normal-hearing adults can be sensitive to ILDs of as low as 0.5 dB (Akeroyd 2006;Harrison 1988). …”

Section: Psychoacoustics Of Binaural Hearingmentioning

confidence: 99%

“…Low frequency sounds are best lateralized by interpreting ITDs because of the loss of phase-locking in the auditory nerve with higher frequency sounds (Macpherson and Middlebrooks 2002). Normal-hearing listeners can recognize timing delays between ears of as small as 10 µs (Akeroyd 2006). : an acoustic signal arrives at the ear closest to the sound source slightly before arriving at the other ear.…”

Section: Psychoacoustics Of Binaural Hearingmentioning

confidence: 99%

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Lateralization of Interimplant Timing and Level Differences in Children Who Use Bilateral Cochlear Implants

et al. 2010

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Cochlear implants provide hearing to people who are deaf, by electrically stimulating the auditory nerve. Children with a single cochlear implant suffer deficiencies inherent to unilateral hearing, including inability to locate sounds. A second cochlear implant may improve sound localization, which normally requires interpretation of differences in sound intensity and time of arrival between two ears. Currently, it is unknown whether these cues are available to children who were provided with a second cochlear implant after a period of using one implant alone. We asked whether such children could interpret inter-implant level and timing cues. Results indicated that children using two cochlear implants detected level cues but had difficulty interpreting timing cues. Further, children rarely reported that sounds were perceived to come from the middle. Children receiving bilateral cochlear implants sequentially do not process bilateral auditory cues normally but can use inter-implant level cues to make judgments about where sound is coming from.ii

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Section: Results From Children With Normal Hearingmentioning

confidence: 99%

Section: Figure 14 the External Components Of A Cochlear Implantmentioning

confidence: 99%

Section: Psychoacoustics Of Binaural Hearingmentioning

confidence: 99%

Section: Psychoacoustics Of Binaural Hearingmentioning

confidence: 99%

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Lateralization of Interimplant Timing and Level Differences in Children Who Use Bilateral Cochlear Implants

et al. 2010

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“…With clinical devices, it has been demonstrated that adding a hearing aid in the nonimplanted ear improves sound source localization and speech perception, as illustrated in a review by Ching et al (2007). However, with their clinical devices, most bimodal listeners are unable to use interaural timing cues which, for normal hearing (NH) listeners, are important for sound source localization and related to binaural unmasking of speech in the presence of spatially separated interfering sounds (Akeroyd 2006;Bronkhorst 2000;Colburn et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Modulation Enhancement in the Electrical Signal Improves Perception of Interaural Time Differences with Bimodal Stimulation

Francart

Lenssen

Wouters

2014

JARO

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Interaural timing cues are important for sound source localization and for binaural unmasking of speech that is spatially separated from interfering sounds. Users of a cochlear implant (CI) with residual hearing in the non-implanted ear (bimodal listeners) can only make very limited use of interaural timing cues with their clinical devices. Previous studies showed that bimodal listeners can be sensitive to interaural time differences (ITDs) for simple single-and three-channel stimuli. The modulation enhancement strategy (MEnS) was developed to improve the ITD perception of bimodal listeners. It enhances temporal modulations on all stimulated electrodes, synchronously with modulations in the acoustic signal presented to the non-implanted ear, based on measurement of the amplitude peaks occurring at the rate of the fundamental frequency in voiced phonemes. In the first experiment, ITD detection thresholds were measured using the method of constant stimuli for five bimodal listeners for an artificial vowel, processed with either the advanced combination encoder (ACE) strategy or with MEnS. With MEnS, detection thresholds were significantly lower, and for four subjects well within the physically relevant range. In the second experiment, the extent of lateralization was measured in three subjects with both strategies, and ITD sensitivity was determined using an adaptive procedure. All subjects could lateralize sounds based on ITD and sensitivity was significantly better with MEnS than with ACE. The current results indicate that ITD cues can be provided to bimodal listeners with modified sound processing.

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Cochlear Implantation in Children With Single-Sided Deafness

Benchetrit

Ronner

Anne

et al. 2021

JAMA Otolaryngol Head Neck Surg

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IMPORTANCEIn 2019, the US Food and Drug Administration approved cochlear implantation for children with single-sided deafness (SSD). The absence of robust clinical data specific to pediatric patients to guide shared decision-making and to identify potential advantages is a challenge in family counseling.OBJECTIVE To evaluate the audiological and patient-reported outcomes in children who underwent cochlear implantation for SSD and to assess the association between time of implantation, subjective outcomes, and cochlear implant device use rates.DATA SOURCE MEDLINE, Embase, Scopus, Cochrane, and PubMed were searched for English-language articles that were published in a peer-reviewed journal from database inception to February 18, 2020.STUDY SELECTION Inclusion criteria were designed to capture studies that evaluated pediatric patients (1) younger than 18 years, (2) with a diagnosis of SSD for which they underwent a cochlear implantation, and (3) with at least 1 outcome of interest measured numerically: speech perception, sound localization, device use, and patient-reported outcomes. Of the 526 articles reviewed, 12 (2.3%) met the selection criteria. DATA EXTRACTION AND SYNTHESISThe Meta-analyses Of Observational Studies in Epidemiology (MOOSE) reporting guidelines were followed. Data were pooled using fixed-effect and random-effect models. The following information was obtained from each article: study characteristics, patient characteristics, hearing loss and intervention characteristics, and outcomes. MAIN OUTCOMES AND MEASURESOutcomes were (1) postoperative changes in speech perception (in quiet was measured as a proportion of correct responses, and in noise was measured as decibel signal to noise ratio for speech reception threshold) and sound localization (measured in degree of localization error), (2) patient-reported audiological outcomes (measured by the speech, spatial, and qualities of hearing scale), and (3) device use rates among children who received cochlear implantation for SSD. RESULTSTwelve observational studies that evaluated 119 children (mean [SD] age, 6.6 [4.0] years) with SSD who received a cochlear implant were included. Most children showed clinically meaningful improvement in speech perception in noise (39 of 49 children [79.6%]) and in quiet (34 of 42 children [81.0%]). Long duration of deafness (>4 years in congenital SSD and >7 years in perilingual SSD) was the most commonly proposed reason for lack of improvement. Sound localization as measured by degrees of error from true location (mean difference [MD], -24.78°; 95% CI, -34.16°to -15.40°; I 2 = 10%) improved statistically significantly after cochlear implantation. Patients with acquired SSD and shorter duration of deafness compared with those with congenital SSD reported greater improvements in speech (MD, 2.27; 95% CI, 1.89-2.65 vs 1.58; 95% CI, 1.00-2.16) and spatial (MD, 2.95; 95% CI, 2.66-3.24 vs 1.68; 95% CI, 0.96-2.39) hearing qualities. The duration of deafness among device nonusers was statistically significantly longer than t...

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The psychoacoustics of binaural hearing

Cited by 109 publications

References 117 publications

Lateralization of Interimplant Timing and Level Differences in Children Who Use Bilateral Cochlear Implants

Lateralization of Interimplant Timing and Level Differences in Children Who Use Bilateral Cochlear Implants

Modulation Enhancement in the Electrical Signal Improves Perception of Interaural Time Differences with Bimodal Stimulation

Cochlear Implantation in Children With Single-Sided Deafness

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