Hearing loss impairs speech perception and loudness perception, which can have negative effects on academic achievement, cognition, and social functioning. Many aspects of deteriorated hearing performance, such as listening to speech in a complex acoustic background, cannot be explained solely on the basis of peripheral damage. Performance on these tasks is likely affected by neural reorganization or deterioration in the central auditory pathway. The long-term goal of our research program is to investigate how acquired hearing loss affects synaptic organization of the auditory system, how these synaptic changes relate to behavioral changes in hearing, and whether or not the synaptic abnormalities can be recovered or prevented. It is important that we investigate the impact of different forms of hearing loss on the brain to understand variable perceptual deficits and unpredictable outcomes after hearing intervention. This grant will support functional and anatomical investigations in mice with noise-induced hearing damage. Mice will be exposed to moderate noise that has been historically characterized as safe and to moderately loud noise known to cause permanent hearing loss. We will measure behavioral changes in temporal processing and loudness perception and investigate the corresponding changes in structure and organization of neural inputs to specific cell types in the ventral cochlear nucleus. These studies will provide important information for understanding complex hearing deficits and may have implications for improving treatment of hearing loss and for noise trauma prevention guidelines.

Public Health Relevance

Alterations in auditory brain structures associated with hearing loss may be correlated with sound perception deficits that cannot be explained solely on the basis of inner ear damage, such as difficulty understanding speech when multiple people are talking simultaneously. We need to understand how the brain changes with hearing loss so we can improve hearing loss treatment and prevent undesirable changes in how the brain processes sound. This project investigates the effects of noise-induced hearing loss on the brain, and how hearing loss-related changes to the brain relate to perceptual difficulties.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Small Research Grants (R03)
Project #
3R03DC012352-01A1S1
Application #
8634167
Study Section
Communication Disorders Review Committee (CDRC)
Program Officer
Cyr, Janet
Project Start
2012-12-01
Project End
2013-11-30
Budget Start
2013-04-01
Budget End
2013-11-30
Support Year
1
Fiscal Year
2013
Total Cost
$9,343
Indirect Cost
$3,576
Name
Johns Hopkins University
Department
Otolaryngology
Type
Schools of Medicine
DUNS #
001910777
City
Baltimore
State
MD
Country
United States
Zip Code
21218