Motor primitives of pointing movements in a three-dimensional workspace

Schütz C, Schack T (2013)
Experimental Brain Research 227(3): 355-365.

Journal Article | Published | English

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Abstract
A central question of motor control is how the motor system deals with redundant degrees of freedom. Redundancy can be reduced by coupling multiple degrees of freedom into a single motor primitive. Previous studies measuring motor primitives in aimed limb movements were restricted to two-dimensional target planes. We asked whether a limited number of motor primitives would also be sufficient to capture the posture variance of aimed limb movements in a three-dimensional target volume. To this end, participants had to point towards virtual targets uniformly spaced in a three-dimensional workspace. Results showed that three motor primitives captured 89.7 +/- A 2.8 % of the data variance of unrestrained pointing movements. Each motor primitive corresponded to a valid movement of the arm. The findings imply that complex postures in a three-dimensional target volume can be reduced to three motor primitives. The reduction results in a unique mapping of target position and posture and, thus, solves the redundancy problem. The reduction further indicates that, in a pointing task, the motor system does not control hand rotation independent of hand translation.
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Schütz C, Schack T. Motor primitives of pointing movements in a three-dimensional workspace. Experimental Brain Research. 2013;227(3):355-365.
Schütz, C., & Schack, T. (2013). Motor primitives of pointing movements in a three-dimensional workspace. Experimental Brain Research, 227(3), 355-365.
Schütz, C., and Schack, T. (2013). Motor primitives of pointing movements in a three-dimensional workspace. Experimental Brain Research 227, 355-365.
Schütz, C., & Schack, T., 2013. Motor primitives of pointing movements in a three-dimensional workspace. Experimental Brain Research, 227(3), p 355-365.
C. Schütz and T. Schack, “Motor primitives of pointing movements in a three-dimensional workspace”, Experimental Brain Research, vol. 227, 2013, pp. 355-365.
Schütz, C., Schack, T.: Motor primitives of pointing movements in a three-dimensional workspace. Experimental Brain Research. 227, 355-365 (2013).
Schütz, Christoph, and Schack, Thomas. “Motor primitives of pointing movements in a three-dimensional workspace”. Experimental Brain Research 227.3 (2013): 355-365.
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Zhang L, Straube A, Eggert T., Exp Brain Res 232(4), 2014
PMID: 24477761

51 References

Data provided by Europe PubMed Central.

Moving and memorizing: motor planning modulates the recency effect in serial and free recall.
Weigelt M, Rosenbaum DA, Huelshorst S, Schack T., Acta Psychol (Amst) 132(1), 2009
PMID: 19591968

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