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Accuracy Assessment for AG500, Electromagnetic Articulograph

Jordan R. Green
Antje Mefferd
University of Nebraska–Lincoln

Contact author: Yana Yunusova, Department of Speech and Language Pathology, Rehabilitation Sciences Building, University of Toronto, 160-500 University Avenue,Toronto, Ontario M5G 1V7, Canada. E-mail: yana.yunusova{at}utoronto.ca.

Purpose: The goal of this article was to evaluate the accuracy and reliability of the AG500 (Carstens Medizinelectronik, Lenglern, Germany), an electromagnetic device developed recently to register articulatory movements in three dimensions. This technology seems to have unprecedented capabilities to provide rich information about time-varying positions of articulators. However, strengths and weaknesses of the system need to be better understood before the device is used for speech research.

Method: Evaluations of the sensor positions over time were obtained during (a) movements of the calibration device, (b) manual movements of sensors in a cartridge within the recording field of the cube, and (c) various speech tasks.

Results: Results showed a median error to be under 0.5 mm across different types of recordings. The maximum error often ranged between 1 and 2 mm. The magnitude of error depended somewhat on the task but largely on the location of the sensors within the recording region of the cube.

Conclusion: The performance of the system was judged as adequate for speech movement acquisition, provided that specific steps are taken for minimizing error during recording and for validating the quality of recorded data.

KEY WORDS: electromagnetic articulography, AG500, speech kinematics

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