Head Movements Allow Listeners Bilaterally Implanted With Cochlear Implants to Resolve Front-Back Confusions

Pastore, M. Torben; Natale, Sarah Cook; Yost, William A.; Dorman, Michael F.

doi:10.1097/aud.0000000000000581

Cited by 36 publications

(59 citation statements)

References 31 publications

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“…The results of the Pastore et al [27] study indicate that when NH listeners did not move their heads they were almost 100% correct in accurately localizing the six sound sources for the HF filtered noise, and therefore there were almost no FBRs (Fig. 4A).…”

Section: Sound Source Localization By Cochlear Implant (Ci) Patientsmentioning

confidence: 90%

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Sound source localization is a multisystem process

Yost

Pastore

Dorman

2020

Acoust. Sci. & Tech.

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A review of data published or presented by the authors from two populations of subjects (normal hearing listeners and patients fit with cochlear implants, CIs) involving research on sound source localization when listeners move is provided. The overall theme of the review is that sound source localization requires an integration of auditory-spatial and head-position cues and is, therefore, a multisystem process. Research with normal hearing listeners includes that related to the Wallach Azimuth Illusion, and additional aspects of sound source localization perception when listeners and sound sources rotate. Research with CI patients involves investigations of sound source localization performance by patients fit with a single CI, bilateral CIs, a CI and a hearing aid (bimodal patients), and single-sided deaf patients with one normal functioning ear and the other ear fit with a CI. Past research involving CI patients who were stationary and more recent data based on CI patients' use of head rotation to localize sound sources is summarized.

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Section: Sound Source Localization By Cochlear Implant (Ci) Patientsmentioning

confidence: 90%

“…The four panels (A, B, C, and D) of Fig. 4 (based on Pastore et al [27]) display confusion matrices (i.e., the loudspeaker location reported by listeners as a function of the location of the actual loudspeaker presenting a sound). In the top row listeners (Fig.…”

Section: Sound Source Localization By Cochlear Implant (Ci) Patientsmentioning

confidence: 99%

Sound source localization is a multisystem process

Yost

Pastore

Dorman

2020

Acoust. Sci. & Tech.

Self Cite

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“…FBC errors are not simply outliers with extreme error amplitudes. The underlying cause is different from normal localization errors (see Figure 1) which is why FBCs should be analyzed seperately [3]- [7].…”

Section: Sound Source (A)mentioning

confidence: 97%

“…In horizontal sound localization experiments, the most common definition classifies responses crossing the interaural axis as FBCs [3]- [6], [8], [9]. This definition, which defines the FBC Rate, is sufficient for experiments that only require a coarse angular resolution of the test setup or feedback method [7], [10], [11]. However, such setups limit the measurement resolution for sound localization accuracy.…”

Section: Sound Source (A)mentioning

confidence: 99%

A Front-Back Confusion Metric in Horizontal Sound Localization: The FBC Score

Fischer

Caversaccio

Wimmer

2020

Preprint

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In sound localization experiments, currently used metrics for front-back confusion (FBC) analysis weight the occurring FBCs equally, regardless of their deviation from the cone of confusion. To overcome this limitation, we introduce the FBC Score. A sound localization experiment in the horizontal plane with 12 bilaterally implanted cochlear implants (CI) users and 12 normal hearing subjects was performed to validate the method with real clinical data. The overall FBC Rate of the CI users was twice as high as the FBC Score. For the control group, the FBC Rate was 4 times higher than the FBC Score. The results indicate that the FBC Rate is inflated by FBCs that show a considerable deviation from the corresponding value on the cone of confusion.

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“…In addition to more comprehensive insight into the localization ability of the subjects, this approach enables the evaluation of FBCs. For broadband noise stimuli in the free field, Makous & Middlebrooks (1990) found average rates of FBCs for 6% of the stimuli, Pastore et al (2018) found 5% and Best et al (2010) reported FBC occurrences of 5%. In this study, we observed FBCs in only 3.6% of the stimuli.…”

Section: Sound Source Localizationmentioning

confidence: 97%

Dynamic sound field audiometry: Static and dynamic spatial hearing tests in the full horizontal plane

et al. 2020

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Although spatial hearing is of great importance in everyday life, today's routine audiological test batteries and static test setups assess sound localization, discrimination and tracking abilities rudimentarily and thus provide only a limited interpretation of treatment outcomes regarding spatial hearing performance. To address this limitation, we designed a dynamic sound field test setup and evaluated the sound localization, discrimination and tracking performance of 12 normal-hearing subjects. During testing, participants provided feedback either through a touchpad or through eye tracking. In addition, the influence of head movement on sound-tracking performance was investigated. Our results show that tracking and discrimination performance was significantly better in the frontal azimuth than in the dorsal azimuth. Particularly good performance was observed in the backward direction across localization, discrimination and tracking tests. As expected, free head movement improved sound-tracking abilities. Furthermore, feedback via gaze detection led to larger tracking errors than feedback via the touchpad. We found statistically significant correlations between the static and dynamic tests, which favor the snapshot theory for auditory motion perception. .

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Head Movements Allow Listeners Bilaterally Implanted With Cochlear Implants to Resolve Front-Back Confusions

Cited by 36 publications

References 31 publications

Sound source localization is a multisystem process

Sound source localization is a multisystem process

A Front-Back Confusion Metric in Horizontal Sound Localization: The FBC Score

Dynamic sound field audiometry: Static and dynamic spatial hearing tests in the full horizontal plane

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