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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.
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Related Experiment Video

Updated: Nov 18, 2025

Foreign Accent and Forensic Speaker Identification in Voice Lineups: The Influence of Acoustic Features Based on Prosody
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Effect of Contralateral Noise on Speech Intelligibility.

Beate Wendt1, Jörg Stadler2, Jesko L Verhey3

  • 1University Hospital of the Otto von Guericke University Magdeburg, Department of Otorhinolaryngology, Germany.

Neuroscience
|February 6, 2021
PubMed
Summary
This summary is machine-generated.

Standard hearing tests may hinder speech understanding. Presenting noise to one ear during speech tests can disrupt brain processing, especially when speech is on the same side as the dominant language hemisphere.

Keywords:
Oldenburg sentence testauditory processingfunctional magnetic resonance imaginghemispheric specializationlanguage

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Area of Science:

  • Audiology
  • Neuroscience
  • Speech Processing

Background:

  • Standard clinical practice for asymmetric hearing loss involves contralateral noise masking.
  • Previous studies suggest contralateral noise can disrupt speech processing and brain activity.
  • Brain activity effects from contralateral noise depend on speech processing lateralization.

Purpose of the Study:

  • To investigate the impact of varying contralateral noise levels on speech intelligibility.
  • To determine if contralateral noise interferes with speech processing based on cortical lateralization.

Main Methods:

  • Speech intelligibility was tested using the Oldenburg Sentence Test (OLSA) with four contralateral noise levels.
  • Cortical lateralization of speech processing was assessed using functional magnetic resonance imaging (fMRI) with a visual speech test.
  • Participants with asymmetric hearing loss were included.

Main Results:

  • High levels of contralateral noise (65 or 80 dB SPL) significantly reduced word intelligibility regardless of ear presentation.
  • For individuals with left-lateralized speech processing, 50 dB SPL contralateral noise reduced intelligibility when speech was presented to the left ear.
  • This reduction occurred when speech stimuli were ipsilateral to the dominant speech processing hemisphere.

Conclusions:

  • Contralateral noise in standard hearing tests may impair speech intelligibility.
  • This masking technique can hinder central speech processing, not just mask auditory input.
  • Clinical practices for asymmetric hearing loss may need re-evaluation to optimize speech perception testing.