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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

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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.
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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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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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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.
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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Relative sound localisation abilities in human listeners.

Katherine C Wood1, Jennifer K Bizley1

  • 1University College London Ear Institute, 332 Grays Inn Road, London, WC1X 8EE, United Kingdom.

The Journal of the Acoustical Society of America
|September 3, 2015
PubMed
Summary
This summary is machine-generated.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Spatial hearing

Background:

  • Spatial acuity is influenced by sound source characteristics.
  • Listener's ability to determine sound source location varies.
  • Auditory spatial localisation is a complex perceptual task.

Purpose of the Study:

  • To assess human spatial localisation abilities using a relative localisation task.
  • To investigate the impact of signal-to-noise ratio and location on spatial acuity.
  • To evaluate the efficacy of different sound localisation models based on spectral characteristics.

Main Methods:

  • A two-alternative forced-choice relative localisation task was employed.
  • Listeners determined the left/right origin of a target sound relative to a reference.
  • Stimuli varied in signal-to-noise ratio, spectral content, and listening conditions.

Main Results:

  • Spatial localisation performance decreased with poorer signal-to-noise ratios and at peripheral locations.
  • The two-channel model adequately described performance for low-pass stimuli dominated by interaural timing differences (ITDs).
  • No tested model fully explained performance for broadband or high-frequency stimuli.

Conclusions:

  • Relative sound localisation is sensitive to acoustic conditions and spatial position.
  • Existing models partially explain spatial hearing, particularly ITD-based localisation.
  • Further research is needed to refine models for complex auditory scenes.