Modern methods for measurement of basilar membrane displacements.
Level 5 - mechanism / opinion, no new human data
Narrative review and methodological overview without primary clinical data
PubMed 842309 · doi:10.3109/00016487709128820
What was done
The paper reviews and discusses physical methods developed to measure sound-induced basilar membrane displacements at levels below classical optical limits. It evaluates one-point methods (capacitive probe, Mössbauer effect, laser interferometry, and optical heterodyne spectroscopy) alongside pattern-assessing methods (time-averaged and real-time holography), comparing their advantages and disadvantages.
What was found
The abstract notes that threshold-intensity basilar membrane displacements occur in the fractional Ångström range, whereas visual measurements used historically are limited to values above 10 000 Å. No primary numerical measurements, comparative performance metrics, or experimental test results are reported in the abstract.
Why it matters
It summarizes the physical instrumentation and optical methods required to capture nanoscale biomechanical responses in the inner ear that were previously undetectable by direct visual microscopy.
Limits
The abstract provides no primary empirical data, sample sizes, or quantitative error comparisons among the methods. The paper is a 1977 narrative methodological review rather than a controlled experimental study.
Cited by
- supports The human ear can detect mechanical displacements on the order of the diameter of a hydrogen atom at the sub-angstrom level.