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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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Interference: Path Lengths01:10

Interference: Path Lengths

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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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.
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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Sound Waves: Interference00:53

Sound Waves: Interference

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Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
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Beats01:09

Beats

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The study of music provides many examples of the superposition of waves and the constructive and destructive interference that occurs. Very few examples of music being performed consist of a single source playing a single frequency for an extended period of time. A single frequency of sound for an extended period might be monotonous to the point of irritation, similar to the unwanted drone of an aircraft engine or a loud fan. Music is pleasant and exciting due to mixing the changing frequencies...
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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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Related Experiment Video

Updated: May 3, 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

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Pitch and timbre interfere when both are parametrically varied.

Valeria C Caruso1, Evan Balaban2

  • 1Cognitive Neuroscience Sector, SISSA, Trieste, Italy ; Center for Cognitive Neuroscience, Duke University, Durham, North Carolina, USA.

Plos One
|January 28, 2014
PubMed
Summary
This summary is machine-generated.

Pitch and timbre perception interact, challenging the idea of independent processing. Sound variations in one dimension influenced judgments in the other, showing their interdependence.

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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Cognitive neuroscience

Background:

  • Pitch and timbre are fundamental sound characteristics derived from frequency content.
  • Previous research yielded conflicting results regarding the independent processing of pitch and timbre.

Purpose of the Study:

  • To investigate the interaction between pitch and timbre perception.
  • To determine if pitch and timbre are processed independently or interactively.

Main Methods:

  • Sequential comparison of sound pairs with parametrically manipulated pitch and timbre variations.
  • Listeners judged auditory identity along either pitch or timbre dimensions.

Main Results:

  • Pitch and timbre variations perceptually interfered with each other.
  • The degree of interference was dependent on the magnitude of change in the unattended dimension.

Conclusions:

  • Pitch and timbre perception are not orthogonal.
  • These auditory dimensions interact during perceptual judgments.