A cochlear-implant (CI) restores high levels of speech understanding to individuals across the lifespan. However, a gap in knowledge exists because we do not understand how aging affects hearing in CI users. Aging is associated with changes at multiple levels of the brain, thereby making it difficult to determine if the poorer auditory performance that occurs with advancing age is a result of changes in the auditory periph- ery, central auditory neural structures, cognition, or a combination of the three mechanisms. Since a CI by- passes the cochlea, we propose an innovative approach for investigating aging and hearing by using a human CI model. Using age (younger vs older adults) and group (CI vs normal hearing, NH) comparisons will allow us to determine the age-related contributions of cochlear and central factors to hearing. The long-term goals of this project are to (1) determine how to maximally remediate age-related auditory and cognitive processing def- icits with a CI and (2) better understand the biological effects of auditory aging. The objective of this grant is to establish age as an observable and significant factor for auditory temporal processing in CI users. Our central hypothesis is that advancing age significantly degrades central temporal processing and speech understanding abilities in CI users, which is independent of the age-related peripheral hearing loss that occurs in acoustically- hearing subjects. The rationale for the proposed research is that there is a rapidly increasing number of older adults that elect to receive a CI, but there is essentially no research on this specific population that fully utilizes the available array of research tools to study hearing in this population; our field arguably has minimal direct evidence and understanding of age-related changes to auditory processing of electrical stimulation. With strong preliminary data in hand, the central hypothesis will be tested by pursuing three specific aims: (1) De- termine the extent to which temporal processing abilities decrease with age using highly-controlled and simple (non-speech) stimuli in CI subjects; (2) Determine the extent to which age-related temporal processing factors affect speech understanding in CI subjects; and (3) Determine the extent to which aging affects cortical tem- poral encoding of speech in CI subjects. This approach is innovative because: (1) the topic of aging in older CI users is an under-studied area and (2) by using a CI model, we will better understand the biological factors un- derlying how aging affects hearing. Our outcomes will provide a significant positive impact on hearing and un- derstanding speech with a CI, which will increase CI users' quality of life.

Public Health Relevance

HEALTH RELEVANCE: The proposed research is relevant to public health because hearing loss in the U.S. affects two-thirds of adults age 70 and older, many of whom would have an improved quality of life given the partial restoration of hearing from a technological intervention called a bionic cochlear implant. This research aims to understand and improve speech understanding for older (>65 yrs) cochlear-implant users. Thus, the proposed research is relevant to NIH's mission to develop new knowledge and improve technologies to help treat disability, NIA's mission to understand the biological effects of aging, and NIDCD's mission to support efforts to create devices that substitute for lost and impaired sensory function.

Agency
National Institute of Health (NIH)
Institute
National Institute on Aging (NIA)
Type
Research Project (R01)
Project #
5R01AG051603-02
Application #
9355563
Study Section
Special Emphasis Panel (ZRG1)
Program Officer
St Hillaire-Clarke, Coryse
Project Start
2016-09-30
Project End
2021-04-30
Budget Start
2017-05-01
Budget End
2018-04-30
Support Year
2
Fiscal Year
2017
Total Cost
Indirect Cost
Name
University of Maryland College Park
Department
Other Health Professions
Type
Schools of Arts and Sciences
DUNS #
790934285
City
College Park
State
MD
Country
United States
Zip Code
20742
Presacco, Alessandro; Innes-Brown, Hamish; Goupell, Matthew J et al. (2017) Effects of Stimulus Duration on Event-Related Potentials Recorded From Cochlear-Implant Users. Ear Hear 38:e389-e393
Goupell, Matthew J; Gaskins, Casey R; Shader, Maureen J et al. (2017) Age-Related Differences in the Processing of Temporal Envelope and Spectral Cues in a Speech Segment. Ear Hear 38:e335-e342
Huang, Yi Ting; Newman, Rochelle S; Catalano, Allison et al. (2017) Using prosody to infer discourse prominence in cochlear-implant users and normal-hearing listeners. Cognition 166:184-200
Jaekel, Brittany N; Newman, Rochelle S; Goupell, Matthew J (2017) Speech Rate Normalization and Phonemic Boundary Perception in Cochlear-Implant Users. J Speech Lang Hear Res 60:1398-1416