Spectral Analysis of Sound Errors in Persons With Apraxia of Speech and Aphasia Incorrect productions of [∫] were compared to correct productions of [s] and [∫] in two subjects with apraxia of speech and aphasia. Frequencies of the peak spectral energy (FPSE) were extracted from power spectrums of monosyllabic words. In addition, in order to verify that [s] and [∫] could be differentiated ... Supplement Article
Supplement Article  |   November 01, 1995
Spectral Analysis of Sound Errors in Persons With Apraxia of Speech and Aphasia
 
Author Affiliations & Notes
  • Julie L. Wambaugh
    Aphasia Rehabilitation Research Laboratory and Clinic Highland Drive VA Medical Center, Pittsburgh
  • Patrick J. Doyle
    Aphasia Rehabilitation Research Laboratory and Clinic Highland Drive VA Medical Center, Pittsburgh
  • Joan E. West
    Aphasia Rehabilitation Research Laboratory and Clinic Highland Drive VA Medical Center, Pittsburgh
  • Michelene M. Kalinyak
    Aphasia Rehabilitation Research Laboratory and Clinic Highland Drive VA Medical Center, Pittsburgh
  • Contact author: Julie L. Wambaugh, PhD, Aphasia Rehabilitation Research Laboratory (126), 7180 Highland Drive, VA Medical Center, Pittsburgh, PA 15206
Article Information
Speech, Voice & Prosodic Disorders / Apraxia of Speech & Childhood Apraxia of Speech / Language Disorders / Aphasia / Supplement: Clinical Aphasiology Conference Supplement
Supplement Article   |   November 01, 1995
Spectral Analysis of Sound Errors in Persons With Apraxia of Speech and Aphasia
American Journal of Speech-Language Pathology, November 1995, Vol. 4, 186-192. doi:10.1044/1058-0360.0404.186
 
American Journal of Speech-Language Pathology, November 1995, Vol. 4, 186-192. doi:10.1044/1058-0360.0404.186

Incorrect productions of [∫] were compared to correct productions of [s] and [∫] in two subjects with apraxia of speech and aphasia. Frequencies of the peak spectral energy (FPSE) were extracted from power spectrums of monosyllabic words. In addition, in order to verify that [s] and [∫] could be differentiated in terms of FPSE, we obtained speech samples of correct productions of [s] and [∫] from two normal male speakers. A perceptual task was also completed by requiring two listeners to categorize recorded productions. Results revealed significant differences among sound categories for Subject 1, but not for Subject 2. That is, Subject 1's incorrect [∫] productions were acoustically different from his homonymous [s] productions, whereas the productions were not acoustically different for Subject 2. These findings suggest that Subject 1's /∫/errors were not errors of substitution, but would be more appropriately characterized as distortions. Conversely, this spectral analysis did not clarify the nature of Subject 2's incorrect /∫/ productions; both substitution and distortion remained possible appropriate descriptors of his sound errors.

Acknowledgments
This research was supported by the Department of Veterans Affairs Rehabilitation Research and Development Project #C692-2RA. The authors wish to thank Christopher Moore and Barry Slansky for their assistance with this project.
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