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Related Concept Videos

Auditory Pathway01:15

Auditory Pathway

6.8K
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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Unrenewable Cells00:50

Unrenewable Cells

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In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...
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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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Hearing01:31

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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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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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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Related Experiment Video

Updated: Dec 16, 2025

Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain
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Stereotactically-guided Ablation of the Rat Auditory Cortex, and Localization of the Lesion in the Brain

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Temporal selectivity declines in the aging human auditory cortex.

Julia Erb1, Lea-Maria Schmitt1, Jonas Obleser1

  • 1Department of Psychology, University of Lübeck, Lübeck, Germany.

Elife
|July 4, 2020
PubMed
Summary
This summary is machine-generated.

Aging auditory cortex shows reduced selectivity for temporal information. Older adults exhibit broader tuning to temporal rates in the brain, a change linked to chronological age.

Keywords:
functional mrihealthy aginghearing losshumanneurosciencepresbycusisspectro-temporal modulationstemporal rate coding

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Area of Science:

  • Neuroscience
  • Auditory Neuroscience
  • Aging Brain Research

Background:

  • Auditory cortical response models use spectro-temporal features for natural sounds.
  • Neurobiological changes in the aging auditory cortex are not well understood.
  • Linking current models to aging auditory cortex changes is lacking.

Purpose of the Study:

  • To model the hemodynamic response in the aging auditory cortex.
  • To investigate age-related changes in the representation of temporal information.
  • To identify specific brain regions affected by aging in the auditory cortex.

Main Methods:

  • Hemodynamic response modeling was used.
  • A rich natural sound mixture was presented to 64 listeners of varying ages.
  • Temporal-rate tuning was analyzed in different auditory cortical regions.

Main Results:

  • Older listeners' auditory cortex showed broader tuning to temporal rates.
  • This loss of temporal selectivity was most prominent in the primary auditory cortex and planum temporale.
  • A direct relationship was found between chronological age and temporal-rate tuning in older adults.

Conclusions:

  • Decreased selectivity to temporal information is a hallmark of the aging auditory cortex.
  • Senescent neural dedifferentiation may underlie the observed loss of temporal selectivity.
  • These findings provide insights into the neurobiological underpinnings of auditory aging.