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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

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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...
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Hearing01:31

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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.
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Auditory Perception01:17

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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...
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Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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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...
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Perception of Sound Waves01:01

Perception of Sound Waves

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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...
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The Cochlea01:13

The Cochlea

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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.
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Assessment of Audio-Tactile Sensory Substitution Training in Participants with Profound Deafness Using the Event-Related Potential Technique
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A speech-based computational auditory signal processing and perception model.

Helia Relaño-Iborra1, Johannes Zaar1, Torsten Dau1

  • 1Hearing Systems Section, Department of Health Technology, Technical University of Denmark, DK-2800 Kgs. Lyngby, Denmark.

The Journal of the Acoustical Society of America
|December 5, 2019
PubMed
Summary
This summary is machine-generated.

A new speech intelligibility model predicts how well people hear speech, even with background noise or hearing loss. This computational auditory model offers a new tool for hearing research.

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Area of Science:

  • Auditory perception
  • Speech intelligibility modeling
  • Computational acoustics

Background:

  • Existing models may not fully capture complex auditory processing.
  • Understanding speech intelligibility is crucial for hearing aid development and audiology.

Purpose of the Study:

  • To introduce a novel speech intelligibility prediction model based on the Computational Auditory Signal Processing and Perception (CASP) model.
  • To evaluate the model's ability to predict speech intelligibility for normal-hearing listeners under various degraded conditions.

Main Methods:

  • The model integrates an auditory-inspired nonlinear preprocessing stage with a cross-correlation backend in the modulation envelope domain.
  • It was tested against speech degraded by additive noise, phase-jitter, and noise reduction, as well as enhanced by ideal binary masks.

Main Results:

  • The model successfully predicted speech intelligibility changes due to various degradations and enhancements.
  • It accurately reflected stimulus-level dependent effects, including audibility limitations and high-level speech intelligibility decline.

Conclusions:

  • The developed speech-based Computational Auditory Signal Processing and Perception model provides a realistic computational framework.
  • It holds potential for investigating the impact of sensorineural hearing impairment on speech intelligibility.