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A relationship between processing speech in noise and dysarthric speech.

Stephanie A Borrie¹, Melissa Baese-Berk², Kristin Van Engen³

¹Department of Communicative Disorders and Deaf Education, Utah State University, Logan, Utah 84322, USA.

The Journal of the Acoustical Society of America

|July 7, 2017

Summary

Listeners use similar strategies to understand degraded speech, whether from background noise or speech impairments. This study shows that speech-in-noise and dysarthric speech processing rely on shared cognitive mechanisms and stress cue utilization.

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Area of Science:

Auditory Perception
Speech Processing
Psychoacoustics

Background:

Individual variability exists in understanding speech in adverse listening conditions.
Degraded speech can result from environmental factors (e.g., noise) or source factors (e.g., dysarthria).

Purpose of the Study:

To investigate the relationship between processing speech in noise and dysarthric speech.
To examine intelligibility performance and the use of metrical stress for speech segmentation under these two conditions.

Main Methods:

Ninety native American English speakers transcribed speech in noise and dysarthric speech.
Analyses included proportion of words correct and lexical segmentation errors to assess stress cue utilization.

Main Results:

Intelligibility in noise correlated with intelligibility of dysarthric speech, suggesting shared processing mechanisms.
Listeners utilized metrical stress for segmentation in both speech-in-noise and dysarthric speech conditions.
Reliance on stress cues for parsing speech in noise correlated with reliance on stress cues for parsing dysarthric speech.

Conclusions:

Cognitive-perceptual processing mechanisms for speech-in-noise and dysarthric speech are similar.
Listeners preferentially deploy the same cognitive-perceptual strategy when metrical stress aids in segmenting degraded speech.