Electrophysiological and Behavioral Evidence of Reduced Binaural Temporal Processing in the Aging and Hearing Impaired Human Auditory System

Trends in Hearing
Charlotte VercammenAstrid van Wieringen

Abstract

A person's ability to process temporal fine structure information is indispensable for speech understanding. As speech understanding typically deteriorates throughout adult life, this study aimed to disentangle age and hearing impairment (HI)-related changes in binaural temporal processing. This was achieved by examining neural and behavioral processing of interaural phase differences (IPDs). Neural IPD processing was studied electrophysiologically through steady-state activity in the electroencephalogram evoked by periodic changes in IPDs over time, embedded in the temporal fine structure of acoustic stimulation. In addition, behavioral IPD discrimination thresholds were determined for the same stimuli. To disentangle potential effects of age from those of HI, both measures were applied to six participant groups: young, middle-aged, and older persons, with either normal hearing or sensorineural HI. All participants passed a cognitive screening, and stimulus audibility was controlled for in participants with HI. The results demonstrated that HI changes neural processing of binaural temporal information for all age-groups included in this study. These outcomes were revealed, superimposed on age-related changes that emerge betwee...Continue Reading

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Citations

Feb 5, 2019·International Journal of Audiology·Jerker RönnbergMary Rudner
Dec 22, 2020·International Journal of Audiology·Won So, Spencer B Smith
Nov 17, 2020·Frontiers in Neuroscience·Tess K KoernerCurtis J Billings
Mar 1, 2021·The Journal of the Acoustical Society of America·Andreas SchroeerDaniel J Strauss

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