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Updated: May 20, 2026

A Method for Tracking the Time Evolution of Steady-State Evoked Potentials
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Published on: May 25, 2019

Neural time course of visually enhanced echo suppression.

Christopher W Bishop1, Sam London, Lee M Miller

  • 1Center for Mind and Brain, University of California, Davis, California 95618, USA. cwbishop@ucdavis.edu

Journal of Neurophysiology
|July 13, 2012
PubMed
Summary

Echo suppression, crucial for understanding speech in noisy environments, is a complex process. This study reveals it involves auditory processing stages and is influenced by vision late in sensory or decision-making stages.

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Area of Science:

  • Neuroscience
  • Auditory Perception
  • Audiovisual Integration

Background:

  • Auditory spatial perception aids speech intelligibility by segregating sound sources.
  • Echoes in environments pose challenges to spatial localization and speech comprehension.
  • The precedence effect (echo suppression) uses timing and visual cues to mitigate echoes.

Purpose of the Study:

  • To investigate the neural time course of echo suppression using electroencephalography (EEG).
  • To examine the influence of visual stimulation on echo suppression mechanisms.
  • To determine the timing of visual contributions to echo suppression.

Main Methods:

  • Electroencephalography (EEG) was used to record brain activity in human listeners.
  • Participants performed echo suppression tasks with and without visual stimulation.

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  • Analysis focused on neural responses related to auditory N1 potentials and later processing stages.

    • Main Results:

    • Echo suppression is a multistage process initiated by auditory N1 (70-100 ms) and followed by space-specific suppression (150-250 ms).
    • Listener's spatial perception (echo suppression or not) correlated with central electrode activity (300-500 ms).
    • Visual stimulation influenced echo suppression late in processing (250-400 ms), suggesting roles in late sensory or decision-making stages.

    Conclusions:

    • Echo suppression is a progressive mechanism modulated by visual input during later cortical processing.
    • Audiovisual interactions extend beyond early sensory processing into late decision-making stages.
    • Findings highlight the complex interplay between auditory and visual systems in spatial perception and echo management.