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| Record Number | 1463 |
| Reference Type | Conference Proceedings |
| Author(s) | Mohajerian, P.;Ijspeert, A.;Schaal, S. |
| Year | 2001 |
| Title | Arm motor control based on superimposed rhythmic and discrete movement primitives |
| Journal/Conference/Book Title | Abstracts of the 31st Meeting of the Society of Neuroscience |
| Keywords | movement primitives, behaviors, dynamic systems, computational motor control, discrete, rhythmic, trajectory planning |
Abstract |
We investigated the principles of human movement generation for elliptical drawing patterns, performed with the unconstrained arm against a planar constraint oriented in various workspace locations and using various pattern sizes. Trajectory data was recorded from the fingertip by video-based recording techniques, and from the seven major joint angles of the arm using a special exoskeleton. The first level of data analysis addressed whether the 2/3-power law can account for the endeffector trajectories. We found a systematic violation of the power law with increasing pattern size similar to (Schaal&Sternad, Exp.Brain.Res.,136, 2001), despite that movement was confined to be planar, which was not the case in S&S. FFT analyses of the joint angular data revealed an increasingly stronger second order frequency component as a function of pattern size. We discuss this effect as evidence for a superimposed discrete movement that regulates the rhythmic elliptical movement pattern to lie in a plane. A model of movement primitives, hypothesizing separate discrete and rhythmic units of action in human motor control, can account for the observed phenomena. This model is also supported by recent fMRI studies (see poster 624.2)
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| Place Published | San Diego, CA, Nov.10-15 |
| Short Title | Arm motor control based on superimposed rhythmic and discrete movement primitives |
| Papers are available as Adobe PDF ".pdf" files. Adobe Reader is available for free for all computer platforms.
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Page last modified on August 10, 2006, at 06:47 PM
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