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Related Concept Videos

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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.
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Properties of Fourier Transform II01:24

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The Fourier Transform (FT) is an essential mathematical tool in signal processing, transforming a time-domain signal into its frequency-domain representation. This transformation elucidates the relationship between time and frequency domains through several properties, each revealing unique aspects of signal behavior.
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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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Related Experiment Video

Updated: Apr 11, 2026

A Method to Study Adaptation to Left-Right Reversed Audition
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Adaptation to shifted interaural time differences changes encoding of sound location in human auditory cortex.

Régis Trapeau1, Marc Schönwiesner2

  • 1International Laboratory for Brain, Music and Sound Research (BRAMS), Department of Psychology, Université de Montréal, Montreal , QC, Canada; Centre for Research on Brain, Language and Music (CRBLM), McGill University, Montreal, QC, Canada.

Neuroimage
|June 10, 2015
PubMed
Summary

Adults can adapt their hearing to altered sound localization cues, like shifted interaural time differences, within days. This auditory plasticity involves neural changes in the brain's auditory cortex, demonstrating remarkable adaptability.

Keywords:
Auditory cortexHemifield codePlasticitySpatial hearingfMRI

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Sensory Plasticity

Background:

  • The auditory system uses acoustic cues to determine sound source location.
  • These cues are crucial for spatial hearing but can be altered by developmental changes or hearing assistive devices.
  • Understanding the neural basis of auditory plasticity in adults is limited.

Purpose of the Study:

  • To investigate the neural mechanisms underlying behavioral recalibration to modified interaural time differences (ITDs) in adult humans.
  • To examine how prolonged exposure to altered auditory cues affects brain activity related to sound localization.
  • To determine if adults can adapt their spatial hearing in a naturalistic, multisensory environment.

Main Methods:

  • Participants wore custom digital earplugs that introduced time delays to sound reaching one ear, modifying interaural time differences (ITDs).
  • Continuous nine-day wear during daily activities.
  • Daily psychoacoustical testing to measure behavioral recalibration.
  • High-resolution functional magnetic resonance imaging (fMRI) before and after the intervention to assess neural changes.

Main Results:

  • Rapid behavioral recalibration to shifted ITDs was observed within days.
  • fMRI revealed changes in the hemispheric lateralization of auditory cortex activity post-recalibration.
  • These neural changes correlated with the behavioral adaptation, indicating a shift in the brain's spatial coding of sound direction.
  • Auditory spatial processing models showed minor shifts in voxel-wise spatial tuning within each hemisphere.

Conclusions:

  • Adults exhibit significant auditory plasticity, adapting their spatial hearing to altered acoustic cues in real-world settings.
  • Recalibration to modified ITDs is associated with functional reorganization in the auditory cortex, specifically concerning hemispheric lateralization and spatial tuning.
  • This study provides insights into the neural mechanisms supporting auditory adaptation and spatial coding.