In the near future most cochlear implant patients will hear with two 'ears'-- either with two cochlear implants (CI) or with a CI and a hearing aid in the opposite ear (combined electric and acoustic hearing or EAS). The goal of the research proposed here is to develop a tool for clinical decision making relative to these two interventions. Clinical decision making will depend critically on the nature of the tests and environments used to assess the benefit of having two ears participate in speech understanding. Standard clinical test environments can only approximate the real world environment of having sound surround the listener. Laboratory environments with multiple, spatially separated speakers can simulate real world environments but cannot be duplicated in the clinic for reasons of time, space and cost. In this project we will test EAS and bilateral CI patients in both standard and realistic test environments with the goal of creating a decision matrix that links data that can be easily collected in the clinic, e.g., CNC scores in quiet and the amount of residual hearing, with data that cannot be collected in the clinic, i.e., data collected with multiple, spatially separated loudspeakers. We propose to test bilateral CI patients and EAS patients in two realistic test environments using an 8-speaker 'surround sound system'which can simulate, with high fidelity, (i) a restaurant environment with speech babble as the noise, and (ii) a cocktail party environment with competing sentence material as the noise - a situation of 'informational'masking.
This project will allow clinicians to make data-driven decisions about options for hearing restoration in patients who qualify for a cochlear implant. The data will allow clinicians to determine whether two cochlear implants, or an implant plus hearing aid, is the better option.
|Gifford, René H; Loiselle, Louise; Natale, Sarah et al. (2018) Speech Understanding in Noise for Adults With Cochlear Implants: Effects of Hearing Configuration, Source Location Certainty, and Head Movement. J Speech Lang Hear Res 61:1306-1321|
|Gifford, René H; Dorman, Michael F (2018) Bimodal Hearing or Bilateral Cochlear Implants? Ask the Patient. Ear Hear :|
|Dorman, Michael F; Natale, Sarah; Spahr, Anthony et al. (2017) Speech Understanding in Noise by Patients With Cochlear Implants Using a Monaural Adaptive Beamformer. J Speech Lang Hear Res 60:2360-2363|
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|Dorman, Michael F; Liss, Julie; Wang, Shuai et al. (2016) Experiments on Auditory-Visual Perception of Sentences by Users of Unilateral, Bimodal, and Bilateral Cochlear Implants. J Speech Lang Hear Res 59:1505-1519|
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|Loiselle, Louise H; Dorman, Michael F; Yost, William A et al. (2015) Sound source localization by hearing preservation patients with and without symmetrical low-frequency acoustic hearing. Audiol Neurootol 20:166-71|
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