Motor primitives of pointing movements in a three-dimensional workspace
Deutscher übersetzter Titel: | Einfachmotorik bei Zeigebewegungen in einem dreidimensionalen Bereich |
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Autor: | Schütz, Christoph; Schack, Thomas |
Erschienen in: | Experimental brain research |
Veröffentlicht: | 227 (2013), 3, S. 355-365, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0014-4819, 1432-1106 |
DOI: | 10.1007/s00221-013-3516-2 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU201411010020 |
Quelle: | BISp |
Abstract des Autors
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 ± 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. Verf.-Referat