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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
The Cochlea01:13

The Cochlea

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.
Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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 identifying...
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...
Hearing01:31

Hearing

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.
Auditory Perception01:17

Auditory Perception

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 cochlea, a...

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Related Experiment Video

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Behavioral Determination of Stimulus Pair Discrimination of Auditory Acoustic and Electrical Stimuli Using a Classical Conditioning and Heart-rate Approach
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Temporal processing in the auditory system: insights from cochlear and auditory midbrain implantees.

Colette M McKay1, Hubert H Lim, Thomas Lenarz

  • 1Audiology & Deafness Research Group, School of Psychological Sciences, University of Manchester, Manchester, M13 9PL, UK. colette.mckay@manchester.ac.uk

Journal of the Association for Research in Otolaryngology : JARO
|October 18, 2012
PubMed
Summary

Auditory midbrain implants (AMI) users show poorer temporal processing than cochlear implant (CI) users due to differences in neural response and wider temporal integration windows, impacting speech understanding.

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Area of Science:

  • Neuroscience
  • Audiology
  • Biomedical Engineering

Background:

  • Central auditory processing is crucial for speech comprehension.
  • Electrical stimulation via auditory implants aims to restore hearing by activating neural pathways.
  • Differences in stimulation targets (auditory nerve vs. midbrain) may lead to distinct processing characteristics.

Purpose of the Study:

  • To investigate and compare central auditory processing in auditory midbrain implant (AMI) and cochlear implant (CI) users.
  • To analyze the perceptual effects of temporal stimulation parameters in both user groups.
  • To develop and refine phenomenological models explaining temporal processing differences.

Main Methods:

  • Four experiments measured detection thresholds, loudness, temporal modulation transfer functions (TMTFs), duration effects, and forward masking decay.
  • Data from CI and AMI users were analyzed using a sliding temporal integration window model.
  • Model parameters were adjusted to fit neural response and integration window characteristics for each implant type.

Main Results:

  • CI data fit a model based on auditory nerve response and a specific integration window.
  • AMI data required modifications to the neural response input and integration window shape.
  • AMI data indicated a steeper decrease in neural response with increasing pulse rate and a wider integration window (poorer temporal resolution) compared to CI users.

Conclusions:

  • Central auditory processing differs significantly between AMI and CI stimulation.
  • Wider temporal integration in AMI users contributes to difficulties in processing temporal cues essential for speech understanding.
  • The developed models offer insights into the functional differences between stimulating the auditory nerve and central auditory structures.