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Does masking alter the mismatch negativity response to gaps?

Victoria Duda1, Thomas M D Augereau2, Kenneth Campbell3

  • 1School of Speech Pathology and Audiology, Université de Montréal, Montreal, Canada; Centre de recherche interdisciplinaire en réadaptation (CRIR), Montréal, Canada.

Brain Research
|April 24, 2025
PubMed
Summary

High-intensity masking noise significantly impairs the auditory system's ability to detect silent gaps, impacting speech perception. Low-level noise, however, has minimal effect on gap detection, showing the auditory system's resilience.

Keywords:
Event-related potentialsGap detectionGaps-in-noiseMaskingMismatch negativityOptimalTemporal processing

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Area of Science:

  • Auditory Neuroscience
  • Psychoacoustics
  • Speech Perception

Background:

  • Difficulties in speech perception in noise are often linked to temporal processing deficits.
  • Temporal resolution, particularly the ability to process silent gaps, is crucial for auditory function.

Purpose of the Study:

  • To investigate the impact of varying noise intensities on the central auditory system's processing of silent gaps.
  • To compare electrophysiological and behavioral measures of gap detection under different masking conditions.

Main Methods:

  • Event-related potentials (deviant-related negativity and P2 components) and psychoacoustic thresholds were measured in 14 normal-hearing adults.
  • A multi-deviant paradigm presented stimuli with gap durations from 2 to 40 ms in quiet, low-intensity (60 dB SPL), and high-intensity (80 dB SPL) noise.
  • Electrophysiological and behavioral data were analyzed to assess gap detection accuracy and neural responses.

Main Results:

  • The amplitude of the deviant-related negativity-P2 component increased with gap duration in quiet and low-intensity noise conditions.
  • This relationship between gap duration and neural response amplitude was absent in high-intensity noise.
  • Behavioral gap detection accuracy decreased significantly under high-intensity masking, and neural measures became less reliable in coding temporal signal aspects.

Conclusions:

  • High-intensity masking noise severely hinders the auditory system's capacity to detect temporal gaps, as evidenced by both electrophysiological and behavioral data.
  • Low levels of masking noise minimally affect gap detection, indicating the auditory system can tolerate some noise without significant performance degradation.