Effects of insertion depth on spatial speech perception in noise for simulations of cochlear implants and single-sided deafness

Zhou, Xiaoqing; Li, Huajun; Galvin, John J.; Fu, Qiuyun; Yuan, Wei

doi:10.1080/14992027.2016.1197426

Cited by 17 publications

(15 citation statements)

References 47 publications

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“…Similarly, a 5.8 dB deficit was observed in SSD subjects when noise was presented to the front. The difference (5.8 dB) between NH listeners (two NH ears) and SSD subjects in the present study was significantly larger than that between monaural listening (simulated SSD by presenting speech and noise to one NH ear only) and binaural listening in NH listeners in a previous study ( Zhou, Li, Galvin, Fu, & Yuan, 2017 ) using the same testing materials (estimated at 1.4 dB). Such a discrepancy could potentially be explained by any impairment of hearing in the better-hearing ear in SSD subjects in the present study.…”

Section: Discussioncontrasting

confidence: 76%

Effect of Tinnitus and Duration of Deafness on Sound Localization and Speech Recognition in Noise in Patients With Single-Sided Deafness

et al. 2018

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Patients with single-sided deafness (SSD) often experience poor sound localization, reduced speech understanding in noise, reduced quality of life, and tinnitus. The present study aims to evaluate effects of tinnitus and duration of deafness on sound localization and speech recognition in noise by SSD subjects. Sound localization and speech recognition in noise were measured in 26 SSD and 10 normal-hearing (NH) subjects. Speech was always presented directly in front of the listener. Noise was presented to the deaf ear, in front of the listener, or to the better hearing ear. Tinnitus severity was measured using visual analog scale and Tinnitus Handicap Inventory. Relative to NH subjects, SSD subjects had significant deficits in sound localization and speech recognition in all listening conditions (p < .001). For SSD subjects, speech recognition in noise was correlated with mean hearing thresholds in the better hearing ear (p < .001) but not in the deaf ear. SSD subjects with tinnitus performed poorer in sound localization and speech recognition in noise than those without tinnitus. Shorter duration of deafness was associated with greater tinnitus and sound localization difficulty. Tinnitus visual analog scale and Tinnitus Handicap Inventory were highly correlated; the degree of tinnitus was negatively correlated with sound localization and speech recognition in noise. Those experiencing noticeable tinnitus may benefit more from cochlear implantation than those without; subjective tinnitus reduction may be correlated with improved sound localization and speech recognition in noise. Subjects with longer duration of deafness demonstrated better sound localization, suggesting long-term compensation for loss of binaural cues.

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Section: Discussioncontrasting

confidence: 76%

Effect of Tinnitus and Duration of Deafness on Sound Localization and Speech Recognition in Noise in Patients With Single-Sided Deafness

et al. 2018

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“…It is also possible that sound quality differences between TFS cues in one ear and coarse spectro-temporal cues in the other may have been much greater than the degree of inter-aural mismatch among the SSD CI simulations. The present findings are also different from a related study by Zhou et al ( 2017 ) using the same SSD CI simulations as in this study. In that study, speech understanding for spatially separated speech and noise worsened as the inter-aural frequency mismatch was increased.…”

Section: Discussioncontrasting

confidence: 99%

Effects of Training on Lateralization for Simulations of Cochlear Implants and Single-Sided Deafness

Zhou

et al. 2018

Front. Hum. Neurosci.

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While cochlear implantation has benefitted many patients with single-sided deafness (SSD), there is great variability in cochlear implant (CI) outcomes and binaural performance remains poorer than that of normal-hearing (NH) listeners. Differences in sound quality across ears—temporal fine structure (TFS) information with acoustic hearing vs. coarse spectro-temporal envelope information with electric hearing—may limit integration of acoustic and electric patterns. Binaural performance may also be limited by inter-aural mismatch between the acoustic input frequency and the place of stimulation in the cochlea. SSD CI patients must learn to accommodate these differences between acoustic and electric stimulation to maximize binaural performance. It is possible that training may increase and/or accelerate accommodation and further improve binaural performance. In this study, we evaluated lateralization training in NH subjects listening to broad simulations of SSD CI signal processing. A 16-channel vocoder was used to simulate the coarse spectro-temporal cues available with electric hearing; the degree of inter-aural mismatch was varied by adjusting the simulated insertion depth (SID) to be 25 mm (SID25), 22 mm (SID22) and 19 mm (SID19) from the base of the cochlea. Lateralization was measured using headphones and head-related transfer functions (HRTFs). Baseline lateralization was measured for unprocessed speech (UN) delivered to the left ear to simulate SSD and for binaural performance with the acoustic ear combined with the 16-channel vocoders (UN+SID25, UN+SID22 and UN+SID19). After completing baseline measurements, subjects completed six lateralization training exercises with the UN+SID22 condition, after which performance was re-measured for all baseline conditions. Post-training performance was significantly better than baseline for all conditions (p < 0.05 in all cases), with no significant difference in training benefits among conditions. Given that there was no significant difference between the SSD and the SSD CI conditions before or after training, the results suggest that NH listeners were unable to integrate TFS and coarse spectro-temporal cues across ears for lateralization, and that inter-aural mismatch played a secondary role at best. While lateralization training may benefit SSD CI patients, the training may largely improve spectral analysis with the acoustic ear alone, rather than improve integration of acoustic and electric hearing.

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“…Monaural speech perception and binaural processing can be degraded by a shift in the mapping of place to frequency ( Suneel et al., 2017 ; Svirsky, Talavage, Sinha, Neuburger, & Azadpour, 2015 ; Wess et al., 2017 ). For example, studies of dichotic vocoded speech recognition with normal-hearing listeners suggest that performance is detrimentally affected by a mismatch in place to frequency mapping across ears ( Wess et al., 2017 ; Zhou, Li, Yuan, Galvin, & Fu, 2017 ). There is some evidence that CI users can learn to accommodate mismatches with respect to pitch perception ( Reiss, Turner, Karsten, & Gantz, 2014 ), and it is possible that a similar process occurs for spatial hearing.…”

Section: Discussionmentioning

confidence: 99%

Effects of Cochlear Implantation on Binaural Hearing in Adults With Unilateral Hearing Loss

et al. 2018

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A FDA clinical trial was carried out to evaluate the potential benefit of cochlear implant (CI) use for adults with unilateral moderate-to-profound sensorineural hearing loss. Subjects were 20 adults with moderate-to-profound unilateral sensorineural hearing loss and normal or near-normal hearing on the other side. A MED-EL standard electrode was implanted in the impaired ear. Outcome measures included: (a) sound localization on the horizontal plane (11 positions, −90° to 90°), (b) word recognition in quiet with the CI alone, and (c) masked sentence recognition with the target at 0° and the masker at −90°, 0°, or 90°. This battery was completed preoperatively and at 1, 3, 6, 9, and 12 months after CI activation. Normative data were also collected for 20 age-matched control subjects with normal or near-normal hearing bilaterally. The CI improved localization accuracy and reduced side bias. Word recognition with the CI alone was similar to performance of traditional CI recipients. The CI improved masked sentence recognition when the masker was presented from the front or from the side of normal or near-normal hearing. The binaural benefits observed with the CI increased between the 1- and 3-month intervals but appeared stable thereafter. In contrast to previous reports on localization and speech perception in patients with unilateral sensorineural hearing loss, CI benefits were consistently observed across individual subjects, and performance was at asymptote by the 3-month test interval. Cochlear implant settings, consistent CI use, and short duration of deafness could play a role in this result.

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Effects of insertion depth on spatial speech perception in noise for simulations of cochlear implants and single-sided deafness

Cited by 17 publications

References 47 publications

Effect of Tinnitus and Duration of Deafness on Sound Localization and Speech Recognition in Noise in Patients With Single-Sided Deafness

Effect of Tinnitus and Duration of Deafness on Sound Localization and Speech Recognition in Noise in Patients With Single-Sided Deafness

Effects of Training on Lateralization for Simulations of Cochlear Implants and Single-Sided Deafness

Effects of Cochlear Implantation on Binaural Hearing in Adults With Unilateral Hearing Loss

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