How early aging and environment interact in everyday listening: From brainstem to behavior through modeling

Barbara Shinn-Cunningham, Dorea R. Ruggles, Hari Bharadwaj

Research output: Chapter in Book/Report/Conference proceedingConference contribution

13 Scopus citations

Abstract

We recently showed that listeners with normal hearing thresholds vary in their ability to direct spatial attention and that ability is related to the fidelity of temporal coding in the brainstem. Here, we recruited additional middle-aged listeners and extended our analysis of the brainstem response, measured using the frequency-following response (FFR). We found that even though age does not predict overall selective attention ability, middle-aged listeners are more susceptible to the detrimental effects of reverberant energy than young adults. We separated the overall FFR into orthogonal envelope and carrier components and used an existing model to predict which auditory channels drive each component. We find that responses in mid- to high-frequency auditory channels dominate envelope FFR, while lower-frequency channels dominate the carrier FFR. Importantly, we find that which component of the FFR predicts selective attention performance changes with age. We suggest that early aging degrades peripheral temporal coding in mid-to-high frequencies, interfering with the coding of envelope interaural time differences. We argue that, compared to young adults, middle-aged listeners, who do not have strong temporal envelope coding, have more trouble following a conversation in a reverberant room because they are forced to rely on fragile carrier ITDs that are susceptible to the degrading effects of reverberation.

Original languageEnglish (US)
Title of host publicationBasic Aspects of Hearing
Subtitle of host publicationPhysiology and Perception
Pages501-510
Number of pages10
Volume787
DOIs
StatePublished - Oct 2 2013

Publication series

NameAdvances in Experimental Medicine and Biology
Volume787
ISSN (Print)0065-2598

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    Shinn-Cunningham, B., Ruggles, D. R., & Bharadwaj, H. (2013). How early aging and environment interact in everyday listening: From brainstem to behavior through modeling. In Basic Aspects of Hearing: Physiology and Perception (Vol. 787, pp. 501-510). (Advances in Experimental Medicine and Biology; Vol. 787). https://doi.org/10.1007/978-1-4614-1590-9-55