J Am Acad Audiol 2019; 30(08): 736-737
DOI: 10.3766/jaaa.308ceu
JAAA CEU Program
Thieme Medical Publishers 333 Seventh Avenue, New York, NY 10001, USA.

JAAA CEU Program

Volume 30, Number 8 (September 2019)
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25. Mai 2020 (online)


    Questions refer to Zaleski-King et al, “Bimodal Cochlear Implant Listeners’ Ability to Perceive Minimal Audible Angle Differences,” 659–671.

    Learner Outcomes:

    Readers of this article should be able to:

    • Summarize the literature describing bimodal access to interaural level and interaural timing difference cues.

    • Discuss the limitations adversely affecting bimodal binaural integration.

    CEU Questions:

    1. The literature has shown that some bimodal listeners can take advantage of interaural cues when speech sources are spatially separated, based on:

      • the head shadow effect

      • binaural summation

      • interaural time difference (ITD) integration

    2. Many of the documented binaural benefits of bimodal stimulation have been demonstrated in:

      • environments providing opportunities for “dip listening” during fluctuations in noise

      • optimized, directly controlled laboratory conditions

      • in comparison to patients with bilateral hearing aids

    3. As high-frequency content increases, interaural level differences (ILDs) are:

      • more salient

      • less salient

      • unchanged

    4. Hearing aid processing produces a(n) _______ timing delay in comparison to cochlear implant (CI) processors, resulting in ________.

      • smaller, difficulty for computation of neural cues

      • larger, difficulty for computation of neural cues

      • equivalent, optimized binaural computation

    5. A broadband stimulus was used in the study to:

      • optimize ILD cues

      • improve access to overall loudness cues

      • provide an opportunity for acoustic and electric stimulation overlap

    6. The interdevice delay (IDD) was used in this study to represent:

      • the difference in delay required for lateralization of the broadband stimulus

      • the delay between the hearing aid (HA) and CI processors required for the listener to achieve a percept of a centered, single stimulus

      • the loudness difference required for equal between-ear intensity percept

    7. The results of this study generally showed that:

      • providing ITD access to bimodal listeners can be achieved through determining the IDD

      • providing localization information to bimodal listeners necessitates more substantial changes to device speech-processing algorithms and fitting procedures

      • providing access to ILDs requires monaural listening for bimodal patients

    8. The authors hypothesized the Listener B6 demonstrated greater difficulty establishing differences in loudness cues because:

      • this listener could not identify ITDs

      • this listener had the most pronounced low-frequency hearing loss in the hearing aid ear

      • this listener had the least experience listening bimodally

    9. One limitation identified by the authors that might have contributed to the variability in interaural loudness perception:

      • differences in compression ratios

      • differences in age of participants

      • differences in hearing aid manufacturer/model

    10. In conclusion, the high variability and the general difficulty demonstrated in tasks requiring binaural comparisons supports the idea that:

      • CIs best preserve ILD cues used for the head shadow effect

      • listeners likely extracted monaural loudness cues to complete the task

      • listening experience determines the ability to compute binaural cues


    Die Autoren geben an, dass kein Interessenkonflikt besteht.