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Interference: Path Lengths01:10

Interference: Path Lengths

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...
Lateralization01:28

Lateralization

Brain lateralization refers to the division of mental processes and functions between the two hemispheres of the brain, a phenomenon that optimizes neural efficiency and underpins complex abilities in humans. This specialization allows each hemisphere to perform tasks where it has a comparative advantage, facilitating more refined cognitive capabilities across different domains.
Sound Waves: Interference00:53

Sound Waves: Interference

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...
Sound Intensity Level00:53

Sound Intensity Level

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.
The human ear can perceive an extensive range of sound intensity, necessitating the use of the logarithmic scale to define a physical quantity—the intensity level. It is a ratio of two intensities and hence a...
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...
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.

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Related Experiment Video

Updated: Jun 10, 2026

A Method to Study Adaptation to Left-Right Reversed Audition
07:14

A Method to Study Adaptation to Left-Right Reversed Audition

Published on: October 29, 2018

Binaural interference in lateralization thresholds for interaural time and level differences.

Laurie M Heller1, Virginia M Richards

  • 1Department of Psychology, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA.

The Journal of the Acoustical Society of America
|July 24, 2010
PubMed
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Area of Science:

  • Auditory perception
  • Psychoacoustics
  • Auditory neuroscience

Background:

  • Auditory spatial perception relies on interaural differences.
  • Understanding how spectrally remote sounds interfere is crucial for auditory scene analysis.

Purpose of the Study:

  • To investigate the impact of a spectrally remote noise band (interferer) on the discrimination of interaural time differences (ITDs) and interaural level differences (ILDs).
  • To determine how target frequency and interferer presentation (diotic vs. dichotic, random vs. fixed ITDs/ILDs) affect auditory interference.

Main Methods:

  • Listeners discriminated ITDs or ILDs in a target noise band.
  • An uninformative, spectrally remote noise band was presented as an interferer.
  • Interferer ITDs/ILDs were varied randomly or presented diotically/dichotically.

Main Results:

  • Interference effects for ITD discrimination were greater for high-frequency targets (4000 Hz) than low-frequency targets (500 Hz).
  • Interference effects for ILD discrimination were greater for low-frequency targets (500 Hz) than high-frequency targets (4000 Hz).
  • Randomly varying interferer ITDs/ILDs significantly increased interference, particularly for low-frequency targets with high-frequency interferers.

Conclusions:

  • Auditory interference depends on target frequency, interaural cue type, and interferer characteristics.
  • A model combining cross-frequency spatial information, weighted by encoding accuracy, explains the observed interference patterns.