5th International Conference on Spoken Language Processing

Sydney, Australia
November 30 - December 4, 1998

An Acoustic Analysis of Vowel Production Across Tasks in a Case of Non-fluent Progressive Aphasia

Karen Croot

School of Communication Sciences and Disorders, University of Sydney, Australia

This paper presents an acoustic investigation of vowel production in reading, naming and repetition tasks by LM, a man with non-fluent progressive aphasia. Plots in the F1/F2 plane showing the centroids of the acoustic targets of [i: E A V O u:] and the formant trajectories of [ai ei ou] demonstrate that LM achieved greater differentiation of targets in reading than in naming or repetition, and that the vowel space for repetition was distorted relative to that of the other two tasks. An earlier study of LM's speech argued that phonological information available from the stimuli in reading and repetition tasks facilitated the activation of stored phonological representations for speech production (Croot, Patterson & Hodges, 1988); the present study suggests that articulatory processing is also facilitated directly or indirectly by the availability of phonological information.

Full Paper

Bibliographic reference.  Croot, Karen (1998): "An acoustic analysis of vowel production across tasks in a case of non-fluent progressive aphasia", In ICSLP-1998, paper 0013.