How repeated loud noise affects hearing over time
Consequences of chronic noise exposure in nonhuman primates
Researchers are using monkeys to learn whether repeated everyday loud noises cause hidden damage inside the ear that can make it hard for adults to hear in noisy places.
Quick facts
| Grant type | U01 cooperative agreement |
|---|---|
| Study type | NIH-funded research |
| Funding institution | Vanderbilt University Medical Center NIH-funded |
| Lab location | 1 site (Nashville, United States) |
| Project ID | NIH-11241087 on NIH RePORTER |
What this research studies
This project exposes macaque monkeys to repeated, everyday-level noise similar to what people experience at work or during recreation. Scientists track hearing thresholds and tests of hearing in noise, and they examine tiny nerve connections in the inner ear (cochlear synapses) for damage. The team compares single high-level noise events with smaller repeated daily exposures and follows animals for months to see which changes are temporary versus long-lasting. From a patient's perspective, the goal is to understand why some people struggle in noisy settings even when standard hearing tests look normal.
Who could benefit from this research
Good fit: Adults with a history of repeated loud noise exposure or who report difficulty hearing in noisy environments would be the most relevant group for related human follow-up studies.
Not a fit: People whose hearing loss is due to known non-noise causes (for example genetic deafness or conductive middle-ear problems) may be unlikely to benefit directly from findings focused on noise-related synapse loss.
Why it matters
Potential benefit: If successful, the work could reveal causes of hidden nerve damage from noise and guide ways to prevent or repair it so people hear better in noisy places.
How similar studies have performed: Rodent studies have repeatedly shown cochlear synapse loss after loud noise and early macaque work supports similar effects, but chronic low-level, human-like exposures remain less studied.
Where this research is happening
Nashville, United States
- Vanderbilt University Medical Center — Nashville, United States (Active)
Researchers
- Principal investigator: Ramachandran, Ramnarayan — Vanderbilt University Medical Center
- Study coordinator: Ramachandran, Ramnarayan
About this research
- This is an active NIH-funded research project — typically early-stage science, not a clinical trial accepting patient enrollment.
- Some NIH-funded labs run parallel clinical studies or seek volunteers for related work. To check, contact the principal investigator or institution listed above.
- For full project details, budget, and progress reports, visit the official NIH RePORTER page below.