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Related Concept Videos

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.
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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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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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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate 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 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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An Automated System for Sound Localization Testing in Hearing-Impaired Listeners
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Age-related changes in sound localisation ability.

Claudia Freigang1, Nicole Richter, Rudolf Rübsamen

  • 1Faculty of Bioscience, Pharmacy and Psychology, University of Leipzig, Talstrasse 33, 04103, Leipzig, Germany, claudia.freigang@gmail.com.

Cell and Tissue Research
|June 17, 2015
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Summary
This summary is machine-generated.

Auditory spatial processing skills change throughout life, declining in older adults. Spatial discrimination is a better measure than localization accuracy for tracking these lifelong changes in auditory perception.

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Area of Science:

  • Neuroscience
  • Psychoacoustics
  • Developmental Psychology

Background:

  • Auditory spatial processing is crucial for everyday function, enabling omnidirectional sound perception.
  • This ability undergoes significant changes across the human lifespan, from infancy to old age.

Purpose of the Study:

  • To review and compare psychoacoustic and electrophysiological data on sound localization and spatial discrimination across different age groups.
  • To investigate how auditory spatial processing abilities develop and change throughout life.

Main Methods:

  • Compilation and analysis of psychoacoustic and electrophysiological experimental data.
  • Comparison of sound localization accuracy and auditory spatial discrimination thresholds in infants, children, young adults, and older adults.

Main Results:

  • Auditory spatial perception develops from imprecise in infants to precise in young adults, then declines in older adults.
  • Older adults show significant deterioration in localization accuracy, likely due to impaired binaural and monaural cue processing.
  • Spatial discrimination thresholds are elevated in both young children and older adults compared to young adults.

Conclusions:

  • Impaired auditory spatial processing in children and older adults may stem from reduced cognitive ability, degraded auditory brain stem processing, or ongoing developmental changes in children.
  • Spatial discrimination ability is a more reliable indicator of changes in auditory space processing over the lifespan than localization accuracy.