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Related Concept Videos

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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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.
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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Hearing

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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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Sound Intensity Level00:53

Sound Intensity Level

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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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Auditory Perception01:17

Auditory Perception

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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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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.
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Related Experiment Video

Updated: May 1, 2026

Behavioral Assessment of Hearing in 2 to 4 Year-old Children: A Two-interval, Observer-based Procedure Using Conditioned Play-based Responses
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Loudness perception affected by early age hearing loss.

Wei Sun1, Qiang Fu2, Chao Zhang3

  • 1Center for Hearing & Deafness, Department of Communicative Disorders and Sciences, State University of New York at Buffalo, 3435 Main Street, Buffalo, NY 14214, USA.

Hearing Research
|April 22, 2014
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Summary

Early age hearing loss, like perforated tympanic membranes (TM), can lead to increased sound sensitivity and seizures in young rats. This suggests a link between early hearing damage and developing tinnitus and hyperacusis in children.

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Area of Science:

  • Neuroscience
  • Otolaryngology
  • Developmental Biology

Background:

  • Tinnitus and hyperacusis are common in adults and also reported in children.
  • Recurrent otitis media is often observed in children with these conditions, but the direct impact of early hearing loss on sound perception is unclear.

Purpose of the Study:

  • To investigate how temporary hearing loss in early life affects sound loudness perception.
  • To explore the underlying neural mechanisms and potential therapeutic interventions for hearing-related sound processing disorders.

Main Methods:

  • Rats with bilateral tympanic membrane (TM) perforation at postnatal 16 days underwent an operant conditioning task to assess sound loudness perception.
  • Gene expression of GABA receptor subunits in the inferior colliculus (IC) was analyzed.
  • The effects of vigabatrin, a GABA-enhancing drug, were evaluated on audiogenic seizures (AGS) and loudness responses.

Main Results:

  • Rats with TM damage showed increased sound loudness perception and susceptibility to AGS.
  • Reduced expression of GABA receptor δ and α6 subunits was observed in the IC of TM-damaged rats.
  • Vigabatrin treatment blocked AGS and attenuated loudness hypersensitivity, with preventative effects when administered early.

Conclusions:

  • Early-age TM damage may lead to a permanent reduction in GABA tonic inhibition in the IC, impairing normal loudness processing.
  • This impairment is a potential risk factor for developing tinnitus and hyperacusis in children.
  • Enhancing GABA levels during critical developmental periods may mitigate brain impairments caused by early hearing loss.