Effects of Age, Cognition, and Neural Encoding on the Perception of Temporal Speech Cues

dc.contributor.authorRoque, Lindsey
dc.contributor.authorKarawani, Hanin
dc.contributor.authorSandra, Gordon-Salant
dc.contributor.authorAnderson, Samira
dc.date.accessioned2020-07-07T16:43:24Z
dc.date.available2020-07-07T16:43:24Z
dc.date.issued2019-07-19
dc.descriptionPartial funding for Open Access provided by the UMD Libraries' Open Access Publishing Fund.en_US
dc.description.abstractOlder adults commonly report difficulty understanding speech, particularly in adverse listening environments. These communication difficulties may exist in the absence of peripheral hearing loss. Older adults, both with normal hearing and with hearing loss, demonstrate temporal processing deficits that affect speech perception. The purpose of the present study is to investigate aging, cognition, and neural processing factors that may lead to deficits on perceptual tasks that rely on phoneme identification based on a temporal cue – vowel duration. A better understanding of the neural and cognitive impairments underlying temporal processing deficits could lead to more focused aural rehabilitation for improved speech understanding for older adults. This investigation was conducted in younger (YNH) and older normal-hearing (ONH) participants who completed three measures of cognitive functioning known to decline with age: working memory, processing speed, and inhibitory control. To evaluate perceptual and neural processing of auditory temporal contrasts, identification functions for the contrasting word-pair WHEAT and WEED were obtained on a nine-step continuum of vowel duration, and frequency-following responses (FFRs) and cortical auditory-evoked potentials (CAEPs) were recorded to the two endpoints of the continuum. Multiple linear regression analyses were conducted to determine the cognitive, peripheral, and/or central mechanisms that may contribute to perceptual performance. YNH participants demonstrated higher cognitive functioning on all three measures compared to ONH participants. The slope of the identification function was steeper in YNH than in ONH participants, suggesting a clearer distinction between the contrasting words in the YNH participants. FFRs revealed better response waveform morphology and more robust phase-locking in YNH compared to ONH participants. ONH participants also exhibited earlier latencies for CAEP components compared to the YNH participants. Linear regression analyses revealed that cortical processing significantly contributed to the variance in perceptual performance in the WHEAT/WEED identification functions. These results suggest that reduced neural precision contributes to age-related speech perception difficulties that arise from temporal processing deficits.en_US
dc.identifierhttps://doi.org/10.13016/98rc-j8bo
dc.identifier.citationRoque L, Karawani H, Gordon-Salant S and Anderson S (2019) Effects of Age, Cognition, and Neural Encoding on the Perception of Temporal Speech Cues. Front. Neurosci. 13:749. doi: 10.3389/fnins.2019.00749en_US
dc.identifier.urihttp://hdl.handle.net/1903/26026
dc.language.isoen_USen_US
dc.publisherFrontiers Mediaen_US
dc.relation.isAvailableAtCollege of Behavioral & Social Sciencesen_us
dc.relation.isAvailableAtHearing & Speech Sciencesen_us
dc.relation.isAvailableAtDigital Repository at the University of Marylanden_us
dc.relation.isAvailableAtUniversity of Maryland (College Park, MD)en_us
dc.titleEffects of Age, Cognition, and Neural Encoding on the Perception of Temporal Speech Cuesen_US
dc.typeArticleen_US
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