The new vestibular stimuli: sound and vibration-anatomical, physiological and clinical evidence.
Level 5 - mechanism / opinion, no new human data
Narrative review of anatomical and physiological mechanisms without systematic search methodology
PubMed 28130556 · doi:10.1007/s00221-017-4874-y
What was done
This paper reviews anatomical and physiological evidence regarding the spatial and mechanical differentiation of otolith maculae, focusing on receptor types, hair bundle stiffness, attachment to the otolithic membrane, and afferent neural responses to sound and vibration stimuli.
What was found
The striola contains predominantly type I receptors with short, stiff hair bundles that project into holes in the otolithic membrane with looser attachment than extrastriolar receptors. Fluid displacement from sound or vibration deflects these hair bundles, activating irregular afferents that exhibit phase-locking to stimulus cycles at frequencies above 2000 Hz. The abstract reports no other quantitative metrics.
Why it matters
It provides the biophysical and physiological rationale supporting the application of sound and vibration stimuli in clinical tests of vestibular function.
Limits
As a narrative review, it lacks a systematic search methodology, quality assessment, and quantitative synthesis. The abstract provides no sample sizes, clinical diagnostic accuracy figures, or human trial data.
Cited by
- supports The inner ear has inner hair cells (flask-shaped) and outer hair cells (cylindrical), while the vestibular system has type I and type II hair cells that detect lower frequency vibrations than the auditory system.