| Sumario: | This investigation was designed to examine articulatory variability over time in an individual with apraxia of speech (AOS) and aphasia. Speech recordings were made on three occasions within an 8-day period. The second and third recordings were conducted 1 day and 1 week following the initial session, respectively. Initial stop consonant productions were examined via perceptual, acoustic, and kinematic analyses. Perceptual analyses revealed that voicing errors were the predominant type of error across sampling times. Sound errors were not predictable for specific words within a sampling session, but were relatively invariable by sound. The AOS speaker produced more variable voice onset times (VOTs) for /p, d, t/ and longer total word durations (TWD) across all sounds in comparison to a control speaker. Lower lip plus jaw movement data revealed increased displacement and velocity for alveolar stops and variable displacement and reduced velocity for bilabial stops for the AOS speaker when compared to the control speaker. For bilabial stops, spatiotemporal index and labial coordination were more variable for the AOS speaker. Extra velocity peaks were found across all sounds produced by the speaker with AOS. Acoustic and kinematic analyses revealed patterns across sounds; however; some distinct patterns were observed for individual sounds.
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