franz - Journal of Motor Behavior 1992 Vol 24 No 3 281-287...

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Journal of Motor Behavior, 1992, Vol. 24, No. 3, 281-287 Evidence of Common Timing Processes in the Control of Manual, Orofacial, and Speech Movements Elizabeth A. Franz Howard N. Zelaznik Anne Smith Department of Psychological Sciences Department of Health, Kinesiology, Department of Audiology Purdue University and Leisure Studies and Speech Sciences Purdue University / ABSTRACT. Recent investigations of timing in motor control In motor tasks, a likely candidate for analysis using the have been interpreted as support for the concept of brain modular- modularity approach is timing. Activities ranging from ity. According to this concept, the brain is organized into func- speech production to playing musical instruments require tional modules that contain mechanisms responsible for general processes. Keele and colleagues (Keele & Hawkins, 1982; Keele precise and accurate timing of successive movement seg- & Ivry. 1987; Keele, Ivry, & Pokomy, 1987; Keele, Pokorny, Car- ments that comprise the Thus. timing is cos, & Ivry, 1985) demonstrated that the within-subject variability be a necessary component in tasks involving coordinated in cycle duration of repetitive movements is correlated across fin- actions (Keele & Hawkins, 1982; Lashley, 1951; Wing & ger. forearm, and foot movements, providing evidence in support ~~i~~~ff~~~~~, 1973). of a general timing module. The present study examines the notion of timing modularity of speech and nonspeech movements of the Keele and colleagues (Keele & Hawkins, 1982; Keele oral motor system as well as the manual motor system. Subjects IvrY & POkOrny, 1987; Pokorny* Corcos, & Ivry9 produced repetitive movements with the finger, forearm, and jaw. 1985) have used different effectors of the limbs to test the 1n addition,-a fourth task involved the reptition of a syllable.- All tasks were to be produced with a 400-111s cycle duration; target duration was established with a pacing tone, which then was re- moved. For each task, the within-subject variability of the cycle duration was computed for the unpaced movements over 20 trials. Significant correlations were found between each pair-of effectors and tasks. The present results provide evidence that common tim- ing processes are involved not only in movements of the limbs, but also in speech and nonspeech movements of oral structures. Key words: individual differences, motor control, motor timing, speech control, timing variability I nvestigators of skilled human behavior recently have pro- posed that collections of mental processes, called mod- ules (Fodor, 1983), mediate the performance of cognitive, perceptual, and motor tasks. This is an alternative to the task-specific view that received support in earlier studies of motor control (Henry, 1968). Proponents of a modular ap- proach to skilled behavior assume that a particular module may be utilized to perform a variety of tasks that involve the same components. Individual differences should exist for tasks that share common modules, so that a subject who performs well on Task A also should perform well on Task B, provided that Tasks A and B utilize some common modules.
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franz - Journal of Motor Behavior 1992 Vol 24 No 3 281-287...

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