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Speech Motor ControlNew developments in basic and applied research$
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Ben Maassen and Pascal van Lieshout

Print publication date: 2010

Print ISBN-13: 9780199235797

Published to Oxford Scholarship Online: March 2012

DOI: 10.1093/acprof:oso/9780199235797.001.0001

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Speech motor timing and fluency

Speech motor timing and fluency

(p.215) Chapter 12 Speech motor timing and fluency
Speech Motor Control

Peter Howell

Andrew Anderson

Jorge Lucero

Oxford University Press

Smith's spatio-temporal index (STI) is widely used to assess variability in motor timing performance in various speaking conditions. STI has been shown to be a sensitive index of developmental changes and as a way of assessing performance differences between speakers with fluency disorders and controls. STI typically takes records obtained from an articulator (e.g., the lower lip) for repeated attempts at the same utterance. STI aligns the set of records linearly, normalizes the amplitude axis, and obtains the standard deviation at fifty points along the aligned time axis which are then averaged to give the index. This chapter uses the functional data analysis (FDA) method that aligns features on the time axis. FDA allows separate estimates of timing and amplitude deformations. When two or more signals are obtained concurrently on utterances, the timing deformations can be compared to estimate their degree of inter coordination. The method is described and applied to see whether a group of speakers who stutter have poorer inter coordination than a group of fluent speakers.

Keywords:   functional data analysis, motor timing, stuttering, inter coordination, fluency disorders

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