On the Tonotopy of the Low-Frequency Region of the Cochlea.
Level 5 - mechanism / opinion, no new human data
Animal experimental physiological study without human data.
PubMed 37225436 · doi:10.1523/JNEUROSCI.0249-23.2023
What was done
The authors investigated frequency selectivity and response patterns across the low-frequency apical region of the cochlea in animal models with low-frequency hearing (guinea pigs, gerbils, and chinchillas of both sexes). Responses to sound were recorded at different locations across the apex to determine if tonotopic organization exists in this region similarly to the cochlear base.
What was found
Sound-evoked responses differed across anatomical locations at the apex of the cochlea in guinea pigs, gerbils, and chinchillas in a pattern consistent with tonotopic organization established for the cochlear base. The abstract reports qualitative observations only and provides no numerical values, frequency ranges, phase lag metrics, or animal sample sizes.
Why it matters
Demonstrating tonotopic organization in the apical, low-frequency region of the cochlea helps validate fundamental auditory mechanics relevant to speech perception and the spatial mapping principles used by cochlear implants.
Limits
The study was conducted entirely in animal models (guinea pigs, gerbils, chinchillas), so direct human apical mechanics were not measured. The abstract omits sample sizes, quantitative physiological measurements, specific stimulus parameters, and statistical analyses.
Cited by
- supports In the cochlea, high frequencies are tonotopically encoded at the base near the middle ear, whereas low frequencies are encoded at the apex.
- supports Georg von Békésy discovered the place-frequency map of the cochlea (high frequencies stimulating the base and low frequencies stimulating the apex) using experiments in human temporal bones.