Abstract
The new University of Wisconsin low-dosage x-ray microbeam system is capable of tracking the movements of multiple (up to ten) small (2–3 mm) gold pellets attached to speech articulators. A variety of speech and nonspeech research questions are currently being addressed by investigators using the microbeam system. These include studies of linguistic issues, acoustic and articulatory modeling, speech motor control, articulatory kinematics, mastication, and swallowing. The system also permits digitization of wideband speech acoustic and other physiological signals. These signals, obtained along with articulatory pellet tracking, include multichannel EMG, glottal impedance, differential oral and nasal airflow rate, air pressure, rib cage and abdominal movement, and external lip LED marker movements. A brief description of the x-ray system operating characteristics and performance specifications as well as overall facility data acquisition and analysis capabilities will be provided. Sample data will be presented in order to illustrate recent findings and highlight important practical considerations associated with running microbeam experimental protocols. [Support for this facility is provided by NINCDS (NS-16373).]
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