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Related Concept Videos

Anatomy of the Ear01:16

Anatomy of the Ear

Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...

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Related Experiment Video

Updated: May 31, 2026

Enhanced Cochlear Coverage and Hearing Preservation in High-Frequency Hearing Loss via Electric Acoustic Stimulation with Longer Electrode
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Published on: October 11, 2024

Use of Envelope Following Response Normative Ranges for Diagnosing Cochlear Deafferentation.

Anne E Heassler1, Garnett P McMillan1, Sean D Kampel1

  • 1VA National Center for Rehabilitative Auditory Research, VA Portland Health Care System, OR.

American Journal of Audiology
|May 29, 2026
PubMed
Summary
This summary is machine-generated.

Establishing normative ranges for envelope following responses (EFRs) aids in diagnosing cochlear deafferentation. A 4-kHz rectangular amplitude-modulated EFR effectively identified Veterans with potential auditory deficits.

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Area of Science:

  • Auditory Neuroscience
  • Audiology
  • Clinical Diagnostics

Background:

  • Cochlear synaptopathy, a form of cochlear deafferentation, is difficult to diagnose due to a lack of established clinical tools.
  • The envelope following response (EFR) shows promise as a diagnostic indicator for deafferentation, but abnormal EFR criteria are not well-defined.

Purpose of the Study:

  • To establish normative ranges for EFR magnitude in a low-risk population.
  • To compare EFRs in a high-risk population against these normative ranges to identify potential deafferentation.

Main Methods:

  • Normative EFR ranges were generated using rectangular amplitude-modulated (RAM) or sinusoidal amplitude-modulated stimuli in young adults with normal hearing and low noise exposure.
  • EFRs were measured in military Veterans with normal audiograms but auditory complaints (tinnitus, sound tolerance issues, speech-in-noise difficulties).
  • EFR data were adjusted for sex and distortion product otoacoustic emission (DPOAE) levels.

Main Results:

  • The 4-kHz RAM EFR provided the greatest distinction between low-risk and high-risk groups, with 31%-34% of Veterans falling below the normative range.
  • Adjusting for DPOAEs did not consistently alter normative ranges across different conditions.
  • Computational models suggest DPOAE adjustment may be unnecessary for individuals with normal audiograms.

Conclusions:

  • Defined normative ranges for the 4-kHz RAM EFR can facilitate clinical identification of cochlear deafferentation in patients with normal audiograms.
  • This diagnostic tool could help identify individuals experiencing auditory deficits despite normal hearing thresholds.