A VOT analysis of apraxic/aphasic voicing errors
Wambaugh, J. L. and West, J. E. and Doyle, P. J.
A VOT analysis of apraxic/aphasic voicing errors. Aphasiology, 11(4-5), 1997, pages 521-532.
The primary purpose of this investigation was to perform a VOT analysis of correct and incorrect productions elicited from an apraxic/aphasic speaker (S1), who consistently devoiced stop and affricate targets. A secondary objective was to analyse the VOTs of an apraxic/aphasic speaker (S2) who produced stop and affricate voicing distinctions correctly, as determined by broad phonetic transcription. Seven hundred and ninety monosyllabic words, representing four voiced-voiceless cognate pairs, were analysed for each subject. VOT results indicated that S1's error productions (i.e. [t] for /d/; [p] for /b/; [k] for /g/; and [t integral] for /d(3)/) differed significantly from his correct, voiceless, homonymous productions (i.e. [t] for /t/; [p] for /p/; [k] for /k/; and [t integral] for /tf/). Therefore, Si's sound errors were not considered to be sound substitutions, as had been indicated perceptually. Overlapping VOT values were found for all of S2's voiced-voiceless cognate pairs, despite perceptually accurate productions, indicating possible speech motor control problems.
|EPrint Type:||Journal (Paginated)|
|Keywords:||ONSET TIME; SPEECH; PERCEPTION; CHILDREN; APHASIA|
|Conference:||Clinical Aphasiology Conference: Clinical Aphasiology Conference (1996 : 26th : Newport, RI : June 1996)|
|Conference Date:||June 1996|
|Publisher:||Taylor & Francis|
|Additional Information:||Copyright by Taylor & Francis Ltd. Used with permission.|