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Related Concept Videos

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.
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...
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.
Harmonic Mean01:09

Harmonic Mean

The arithmetic mean is usually skewed towards the larger values in the data set. Therefore, to avoid this inherent bias towards smaller values, the harmonic mean is used.
Take the example of the speed of a car, which is the measure of the rate of distance traveled. If the vehicle traverses the same distance back-and-forth, its average speed equals the total distance traveled divided by the total time taken. However, if the car moves with varying speeds, then the arithmetic mean is more skewed...
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...
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...

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Related Experiment Video

Updated: May 13, 2026

Infant Auditory Processing and Event-related Brain Oscillations
06:34

Infant Auditory Processing and Event-related Brain Oscillations

Published on: July 1, 2015

Temporal coherence versus harmonicity in auditory stream formation.

Christophe Micheyl1, Heather Kreft, Shihab Shamma

  • 1Department of Psychology, University of Minnesota, Minneapolis, Minnesota 55455, USA. cmicheyl@umn.edu

The Journal of the Acoustical Society of America
|March 8, 2013
PubMed
Summary
This summary is machine-generated.

Temporal incoherence aids auditory stream segregation. Deviations from harmonic relationships can also improve segregation, even with temporally aligned sounds.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Cognitive neuroscience

Background:

  • Concurrent stream segregation is crucial for understanding complex auditory scenes.
  • Temporal coherence and harmonic relationships are known factors influencing auditory perception.

Purpose of the Study:

  • To investigate how temporal incoherence and inharmonicity affect concurrent stream segregation.
  • To determine the role of temporal regularity and harmonic relationships in auditory scene analysis.

Main Methods:

  • Participants performed frequency discrimination tasks on target tones within multi-tone backgrounds.
  • Stimuli varied in temporal coherence (regular vs. random) and harmonicity (harmonic vs. inharmonic) between targets and background.

Main Results:

  • Temporal incoherence between target tones and background significantly facilitated stream segregation.
  • Deviations from harmonicity also led to improved stream segregation, even when temporal coherence was present.

Conclusions:

  • Temporal incoherence is a key factor in enabling auditory stream segregation.
  • Inharmonic relationships between sounds can also promote segregation, suggesting multiple cues for auditory scene analysis.