Related Experiment Video
Updated: Aug 23, 2025
06:04
Systematic Hearing Performance Evaluation Process for Adolescents with Cochlear Implantation at Early Ages
Published on: March 24, 2023
458
Assessing the Relationship Between Pitch Perception and Neural Health in Cochlear Implant Users
1Program of Speech and Hearing Science, College of Health Solutions, Arizona State University, 975 S. Myrtle Av., Tempe, AZ, 85287, USA.
Journal of the Association for Research in Otolaryngology : JARO
|November 4, 2022
Summary
Neural health estimates in cochlear implant (CI) users showed weak correlations with speech performance. The interphase gap (IPG) offset effect may predict place pitch sensitivity and virtual channel perception in CI users.
Area of Science:
- Neuroscience
- Audiology
- Biomedical Engineering
Background:
- Neural health estimates in cochlear implant (CI) users often lack consistent correlation with speech recognition.
- Existing psychophysical and electrophysiological measures show variability in predicting CI user outcomes.
Purpose of the Study:
- To investigate correlations between neural health estimates and temporal/place pitch sensitivity in CI users.
- To determine if neural health estimates correlate better with pitch perception than with speech recognition.
Main Methods:
- Measured polarity effect (PE), multipulse integration (MPI), and interphase gap (IPG) effect on electrically evoked compound action potential (ECAP) amplitude growth function (AGF) in 8 adult CI users.
- Assessed temporal and place pitch sensitivity using amplitude modulation frequency ranking (AMFR) and virtual channel ranking (VCR) thresholds.
- Evaluated AzBio sentence recognition in noise using the clinical CI processor.
Main Results:
- Poorer AMFR and VCR thresholds were observed on basal electrodes compared to apical and middle electrodes.
- The IPG offset effect on ECAP AGF showed a nearly significant negative correlation with VCR threshold.
- No significant correlations were found between mean neural health estimates, mean pitch-ranking thresholds, and speech recognition scores.
Conclusions:
- Central axon demyelination, indicated by the IPG offset effect, may be crucial for place pitch sensitivity in CI users.
- The IPG offset effect could potentially predict perceptual resolution of virtual channels for CI programming.
Related Concept Videos
01:21Perceiving Loudness, Pitch, and Location
395
The human brain perceives pitch through two primary mechanisms reflected in place theory and frequency theory. Each mechanism describes how sound waves are interpreted as specific pitches by the brain, offering insights into the intricate processes of auditory perception.
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
Place theory, or place coding, suggests that different pitches are heard because various sound waves activate specific locations along the cochlea's basilar membrane. The brain determines the pitch of a sound by...
395
01:13The Cochlea
45.7K
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.
45.7K
01:31Hearing
52.9K
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
52.9K
01:01Perception of Sound Waves
4.6K
The human ear is not equally sensitive to all frequencies in the audible range. It may perceive sound waves with the same pressure but different frequencies as having different loudness. Moreover, the perception of sound waves depends on the health of an individual's ears, which decays with age. The health of one's ears may also be affected by regular exposure to loud noises.
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
The pitch of a sound depends on the frequency and the pressure amplitude of the source. Two sounds of the same...
4.6K
01:22Hair Cells
41.1K
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.
41.1K
01:17Auditory Perception
473
The auditory system is essential for sound perception, utilizing various critical structures. When sound waves enter the outer ear, they travel through the ear canal and cause the eardrum to vibrate. These vibrations are then transmitted to the middle ear, where three tiny bones – the malleus, incus, and stapes – amplify the sound. This amplification is crucial, as it ensures that the sound vibrations are strong enough to be conveyed to the inner ear. These vibrations then reach the...
473