Related Experiment Video
Updated: Apr 23, 2026
09:54
Morphological and Functional Evaluation of Ribbon Synapses at Specific Frequency Regions of the Mouse Cochlea
Published on: May 10, 2019
11.5K
Estimating cochlear frequency selectivity with stimulus-frequency otoacoustic emissions in chinchillas
Karolina K Charaziak1, Jonathan H Siegel
1Department of Communication Sciences and Disorders, School of Communication, Northwestern University, 2240 Campus Drive, Evanston, IL, 60208-2952, USA, KarolinaCharaziak2013@u.northwestern.edu.
Journal of the Association for Research in Otolaryngology : JARO
|September 19, 2014
Summary
Stimulus-frequency otoacoustic emissions (SFOAEs) can estimate cochlear tuning at high frequencies, but not reliably at low frequencies. SFOAE group delays and suppression tuning curves show varying accuracy compared to direct measures.
Area of Science:
- Auditory Neuroscience
- Otoacoustic Emissions
- Cochlear Physiology
Background:
- Otoacoustic emissions (OAEs) offer a non-invasive method to assess cochlear function.
- Stimulus-frequency OAEs (SFOAEs) are proposed for estimating cochlear frequency selectivity.
- Two SFOAE-based methods, group delays (SF-GDs) and suppression tuning curves (SF-STCs), exist.
Purpose of the Study:
- To evaluate the correlation between SFOAE-derived tuning estimates (SF-GDs and SF-STCs) and direct cochlear tuning measures (CAP-STCs) in chinchillas.
- To determine the reliability of SFOAE methods for predicting individual cochlear tuning.
Main Methods:
- SFOAEs were evoked using low probe levels (30 dB SPL) in chinchillas.
- Cochlear frequency selectivity was assessed using SF-GDs and SF-STCs.
- These SFOAE measures were compared against compound action potential suppression tuning curves (CAP-STCs).
Main Results:
- SFOAE-based tuning estimates correlated with CAP-STCs for probe frequencies above 3 kHz.
- SF-GD predictions of tuning were sharper than CAP-STCs.
- SF-STCs were broader than CAP-STCs, suggesting a wider generation region for SFOAEs.
- No significant correlation was found between SFOAE measures and CAP-STCs below 3 kHz.
Conclusions:
- SFOAEs show potential for estimating cochlear tuning at higher frequencies (>3 kHz).
- Neither SFOAE method reliably predicts individual cochlear tuning, especially at low frequencies (<3 kHz).
- Low-frequency SFOAEs may originate from a broad cochlear region, limiting their precision.
More Related Videos
Related Concept Videos
01:13The Cochlea
40.8K
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
40.8K
01:22Hair Cells
36.0K
Hair cells are the sensory receptors of the auditory system—they transduce mechanical sound waves into electrical energy that the nervous system can understand. Hair cells are located in the organ of Corti within the cochlea of the inner ear, between the basilar and tectorial membranes. The actual sensory receptors are called inner hair cells. The outer hair cells serve other functions, such as sound amplification in the cochlea, and are not discussed in detail here.
36.0K