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Interference from audio distracters during speechreading.

Douglas S Brungart1, Brian D Simpson

  • 1Air Force Research Laboratory, WPAFB, Ohio 45433, USA. douglas.brungart@wpafb.af.mil

The Journal of the Acoustical Society of America
|January 20, 2006
PubMed
Summary
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Simultaneous mismatched audio speech significantly impairs visual speechreading. Other audio distractions like noise or reversed speech do not affect speechreading performance.

Area of Science:

  • Auditory Perception
  • Visual Perception
  • Speech Processing

Background:

  • Audio-visual speech perception research often focuses on visual influence on auditory perception.
  • Less explored is how auditory signals impact visual speech perception (speechreading).

Purpose of the Study:

  • To investigate the impact of various distracting audio signals on speechreading performance.
  • To determine if simultaneous audio speech degrades visual speech perception.

Main Methods:

  • Participants performed a color and number keyword speechreading task.
  • Distracting audio signals included noise, time-reversed speech, continuous speech, and simultaneous speech.
  • The timing and semantic similarity of audio distracters were manipulated.

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Main Results:

  • Speechreading performance was significantly degraded only when the distracting audio was speech presented simultaneously with the visual stimulus.
  • This degradation was independent of semantic similarity but reduced when audio onset was shifted.
  • Noise, time-reversed speech, and continuous speech did not affect speechreading.

Conclusions:

  • Visual speech perception is impaired by simultaneous, mismatched audio speech.
  • The timing of audio stimuli is critical for its effect on speechreading.
  • Non-speech or non-simultaneous audio distracters have minimal impact on speechreading.