Sensitivity of smoothness measures to movement duration, Amplitude, and Arrests.
Name
Hogan-Sensitivity of Smoothness.pdf
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688.25 KB
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Author(s)
Hogan, Neville
Sternad, Dagmar
Date Issued
August 2010
Journal
Journal of Motor Behavior
Publisher
Routledge
Citation
Hogan, Neville, and Dagmar Sternad. “Sensitivity of Smoothness Measures to Movement Duration, Amplitude, and Arrests.” Journal of Motor Behavior 41 (2009): 529-534. Web. 30 Nov. 2011. © 2009 Heldref Publications
Version
Final published version
Abstract
Studies of sensory-motor performance, including those concerned with changes because of age, disease, or therapeutic intervention, often use measures based on jerk, the time derivative of acceleration, to quantify smoothness and coordination. However, results have been mixed: some researchers report sensitive discrimination of subtle differences, whereas others fail to find significant differences even when they are obviously present. One reason for this is that different measures have been used with different scaling factors. These measures are sensitive to movement amplitude or duration to different degrees. The authors show that jerk-based measures with dimensions vary counterintuitively with movement smoothness, whereas a dimensionless jerk-based measure properly quantifies common deviations from smooth, coordinated movement.
MIT Department
Massachusetts Institute of Technology. Department of Brain and Cognitive Sciences
Massachusetts Institute of Technology. Department of Mechanical Engineering
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.3200/35-09-004-RC
