This investigation examined perceptual learning of dysarthric speech. Forty listeners were randomly assigned to one of two identification training tasks, aimed at highlighting either the linguistic (word identification task) or indexical (speaker identification task) properties of the neurologically degraded signal. Twenty additional listeners served as a control group, passively exposed to the training stimuli. Immediately following exposure to dysarthric speech, all three listener groups completed an identical phrase transcription task. Analysis of listener transcripts revealed remarkably similar intelligibility improvements for listeners trained to attend to either the linguistic or the indexical properties of the signal. Perceptual learning effects were also evaluated with regards to underlying error patterns indicative of segmental and suprasegmental processing. The findings of this study suggest that elements within both the linguistic and indexical properties of the dysarthric signal are learnable and interact to promote improved processing of this type and severity of speech degradation. Thus, the current study extends support for the development of a model of perceptual processing in which the learning of indexical properties is encoded and retained in conjunction with linguistic properties of the signal.
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January 2013
January 03 2013
The role of linguistic and indexical information in improved recognition of dysarthric speech
Stephanie A. Borrie;
Stephanie A. Borrie
a)
Department of Communication Disorders and New Zealand Institute of Language, Brain and Behaviour,
University of Canterbury
, Private Bag 4800, Christchurch 8140, New Zealand
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Megan J. McAuliffe;
Megan J. McAuliffe
Department of Communication Disorders and New Zealand Institute of Language, Brain and Behaviour,
University of Canterbury
, Private Bag 4800, Christchurch 8140, New Zealand
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Julie M. Liss;
Julie M. Liss
Department of Speech and Hearing Sciences,
Arizona State University
, P.O. Box 870102, Tempe, Arizona 85287-0102
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Greg A. O'Beirne;
Greg A. O'Beirne
Department of Communication Disorders and New Zealand Institute of Language, Brain and Behaviour,
University of Canterbury
, Private Bag 4800, Christchurch 8140, New Zealand
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Tim J. Anderson
Tim J. Anderson
New Zealand Brain Research Institute
, 66 Stewart St, Christchurch 8011, New Zealand
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a)
Author to whom correspondence should be addressed. Electronic mail: steph.borrie@gmail.com
J. Acoust. Soc. Am. 133, 474–482 (2013)
Article history
Received:
January 12 2012
Accepted:
November 12 2012
Citation
Stephanie A. Borrie, Megan J. McAuliffe, Julie M. Liss, Greg A. O'Beirne, Tim J. Anderson; The role of linguistic and indexical information in improved recognition of dysarthric speech. J. Acoust. Soc. Am. 1 January 2013; 133 (1): 474–482. https://doi.org/10.1121/1.4770239
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