Presbycusis - age-related hearing loss - is the primary communication disorder and one of the three top chronic medical conditions of our aged population. This program project consists of a set of discrete but connected disciplines organized to (1) investigate fundamental perceptual declines in presbycusis, and (2) to determine its neural and molecular bases. Discipline-oriented strategies are employed in a common set of specific aims building on key distinctions that have been discovered concerning the specialized roles of the ear and the brain and how they interact as one ages. We also focus on interactions observed among aging, disease/treatment states such as hormone imbalances, and their associated peripheral and central hearing deficits. Aging auditory deficits result in two main perceptual problems;loss in sensitivity biased toward the higher frequencies critical for understanding speech, and a serious reduction in sound processing capacity essential for understanding speech in background noise. Notably, we have demonstrated that temporal and spatial processing problems linked to speech perception-in-noise difficulties in the aged reside partly in auditory brainstem neural circuitry. The administrative, animal, and structure-function services cores will serve four multidisciplinary projects with experimental approaches ranging from audiology, speech perception, psychoacoustics, evoked potentials and psychophysics in humans, to startle reflex psychology, neurophysiology, evoked potentials, single-unit physiology, neuroanatomy, immunohistochemistry, and molecular biology in animals. Although translational interventions lie on the horizon, several additional aspects of the neural bases of age-related hearing loss must be investigated before they will be successful. In the next grant period, we propose a set of synergistically related human and animal experiments attacking these remaining issues to ensure eventual bench-to-bedside success:
SPECIFIC AIM 1 : Investigate Age-Related Changes in Spectro- Temporal Processing and Roles of lon Channels in these Changes.
SPECIFIC AIM 2 : Investigate Age- related Processing Declines for Competing Signals in Semi-Reverberant Listening Environments and the Underlying Neural Circuitry.
SPECIFIC AIM 3 : Investigate the Neural Bases and Possible Reversibility of the Accelerated Age-Related Hearing Loss Associated with Medical Conditions: Ear and Brain Analyses.
Hearing problems now affect over 30 million people in the US, over 10% of our population, with a disproportionate number among our middle aged and old. Our Program Project aims at advancing knowledge of what changes occur in the parts ofthe ear and brain used for hearing during normal aging, and with coincident medical conditions, aimed at translational, bench-to-bedside, clinical trial endpoints.
|Eddins, Ann Clock; Ozmeral, Erol J; Eddins, David A (2018) How aging impacts the encoding of binaural cues and the perception of auditory space. Hear Res 369:79-89|
|Hoover, Eric C; Eddins, Ann C; Eddins, David A (2018) Distribution of spectral modulation transfer functions in a young, normal-hearing population. J Acoust Soc Am 143:306|
|Eddins, Ann Clock; Eddins, David A (2018) Cortical Correlates of Binaural Temporal Processing Deficits in Older Adults. Ear Hear 39:594-604|
|Ozmeral, Erol J; Eddins, Ann C; Eddins, David A (2018) How Do Age and Hearing Loss Impact Spectral Envelope Perception? J Speech Lang Hear Res 61:2376-2385|
|Walton, Joseph P; Dziorny, Adam C; Vasilyeva, Olga N et al. (2018) Loss of the Cochlear Amplifier Prestin Reduces Temporal Processing Efficacy in the Central Auditory System. Front Cell Neurosci 12:291|
|Scott, L L; Brecht, E J; Philpo, A et al. (2017) A novel BK channel-targeted peptide suppresses sound evoked activity in the mouse inferior colliculus. Sci Rep 7:42433|
|Bazard, Parveen; Frisina, Robert D; Walton, Joseph P et al. (2017) Nanoparticle-based Plasmonic Transduction for Modulation of Electrically Excitable Cells. Sci Rep 7:7803|
|Watson, Nathan; Ding, Bo; Zhu, Xiaoxia et al. (2017) Chronic inflammation - inflammaging - in the ageing cochlea: A novel target for future presbycusis therapy. Ageing Res Rev 40:142-148|
|Brecht, Elliott J; Barsz, Kathy; Gross, Benjamin et al. (2017) Increasing GABA reverses age-related alterations in excitatory receptive fields and intensity coding of auditory midbrain neurons in aged mice. Neurobiol Aging 56:87-99|
|Frisina, Robert D; Ding, Bo; Zhu, Xiaoxia et al. (2016) Age-related hearing loss: prevention of threshold declines, cell loss and apoptosis in spiral ganglion neurons. Aging (Albany NY) 8:2081-2099|
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