Loss of inner-ear nerve connections and how it affects hearing test results
Cochlear synaptopathy and audiometric measures from human temporal-bone cases of sensorineural hearing loss
This project looks at donated human inner ears to learn how loss of nerve connections affects hearing and speech understanding in people with sensorineural hearing loss.
Quick facts
| Grant type | NIH-funded research |
|---|---|
| Study type | NIH-funded research |
| Funding institution | Massachusetts Eye and Ear Infirmary NIH-funded |
| Lab location | 1 site (Boston, United States) |
| Project ID | NIH-11158995 on NIH RePORTER |
What this research studies
Because the inner ear can't be biopsied, researchers examine donated post-mortem temporal bones under a microscope to see changes at the cell and nerve level. They compare patterns of hair cell loss and auditory nerve (synapse) loss with patients' past hearing tests and speech scores to understand why people with similar audiograms can hear differently. The work builds on earlier findings that nerve loss can outpace hair cell loss and is worse after noise exposure, and it will expand to include causes like ototoxic antibiotics, chemotherapy, sudden hearing loss, and Ménière's disease. By using archived human specimens and statistical models, the team aims to link microscopic damage to real-world hearing problems such as trouble understanding speech and tinnitus.
Who could benefit from this research
Good fit: Ideal candidates are people with sensorineural hearing loss — especially those with a history of noise exposure, ototoxic drugs, sudden hearing loss, or Ménière’s disease — who would consider donating their temporal bones after death or joining related clinical efforts.
Not a fit: People whose hearing problems are purely conductive (middle- or outer-ear conditions) or unrelated to hair-cell or nerve damage are unlikely to benefit directly from these findings.
Why it matters
Potential benefit: If successful, this work could help doctors detect hidden nerve damage and guide treatments to improve speech understanding and reduce tinnitus for people with sensorineural hearing loss.
How similar studies have performed: Prior animal studies and earlier human temporal bone analyses from this group have shown similar patterns of nerve loss and links to speech understanding, so this work builds on promising prior results.
Where this research is happening
Boston, United States
- Massachusetts Eye and Ear Infirmary — Boston, United States (Active)
Researchers
- Principal investigator: Liberman, M. Charles — Massachusetts Eye and Ear Infirmary
- Study coordinator: Liberman, M. Charles
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.