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Related Concept Videos

Perceiving Loudness, Pitch, and Location01:21

Perceiving Loudness, Pitch, and Location

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 identifying...
Hearing01:31

Hearing

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.
The Cochlea01:13

The Cochlea

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.
Auditory Pathway01:15

Auditory Pathway

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 the...
Perception of Sound Waves01:01

Perception of Sound Waves

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 frequency...
Auditory Perception01:17

Auditory Perception

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 cochlea, a...

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Related Experiment Video

Updated: Jun 24, 2026

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals
11:15

fMRI Mapping of Brain Activity Associated with the Vocal Production of Consonant and Dissonant Intervals

Published on: May 23, 2017

The neural bases underlying pitch processing difficulties.

Jessica M Foxton1, Nathan Weisz, Françoise Bauchet-Lecaignard

  • 1INSERM U821, Lyon 1 University, Brain Dynamics and Cognition laboratory, Lyon, F-69500, France.

Neuroimage
|April 8, 2009
PubMed
Summary
This summary is machine-generated.

Even typical listeners struggle with pitch processing. This study found that individuals with poor pitch discrimination show increased left auditory cortex activity, suggesting suboptimal brain hemisphere use for pitch analysis.

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Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies
05:22

Dissociation of the Confounding Influences of Expectancy and Integrative Difficulty Residing in Anomalous Sentences in Event-related Potential Studies

Published on: May 9, 2019

Area of Science:

  • Neuroscience
  • Auditory Perception
  • Psychoacoustics

Background:

  • Many individuals exhibit difficulties in processing auditory pitch changes.
  • The underlying neural mechanisms of pitch processing deficits are not fully understood.
  • Magnetoencephalography (MEG) offers high temporal and spatial resolution for studying brain activity.

Purpose of the Study:

  • To investigate the neural correlates of poor pitch change processing in normal hearing listeners.
  • To compare brain activity between individuals with good and poor pitch discrimination thresholds.
  • To explore the role of auditory cortical regions in pitch direction perception.

Main Methods:

  • Participants were divided into 'poor' and 'good' threshold groups based on a pitch-direction task.
  • Magnetoencephalography (MEG) was used to record brain activity during active and passive listening tasks.
  • Source-space projected MEG data were analyzed to identify differences in neural activation patterns.

Main Results:

  • The poor threshold group exhibited greater left auditory cortical activity during active pitch glide direction determination.
  • No significant difference in activity was observed between groups in the good threshold group during the active task.
  • A mismatch negativity (MMNm) response to pitch-glide direction deviants was observed, tending to be smaller in poor listeners.

Conclusions:

  • Difficulties in pitch processing are evident even during automatic auditory processing.
  • Left hemisphere auditory regions are utilized by individuals with poor pitch discrimination for conscious pitch direction analysis.
  • Findings suggest that some individuals may process pitch using a less optimal hemisphere, potentially impacting frequency resolution.