Complex Upper-Limb Movements Are Generated by Combining Motor Primitives that Scale with the Movement Size.

ABSTRACT: The hand trajectory of motion during the performance of one-dimensional point-to-point movements has been shown to be marked by motor primitives with a bell-shaped velocity profile. Researchers have investigated if motor primitives with the same shape mark also complex upper-limb movements. They have done so by analyzing the magnitude of the hand trajectory velocity vector. This approach has failed to identify motor primitives with a bell-shaped velocity profile as the basic elements underlying the generation of complex upper-limb movements. In this study, we examined upper-limb movements by analyzing instead the movement components defined according to a Cartesian coordinate system with axes oriented in the medio-lateral, antero-posterior, and vertical directions. To our surprise, we foun

SUBMITTER: Miranda JGV 

PROVIDER: S-EPMC6110807 | biostudies-literature | 2018 Aug

REPOSITORIES: biostudies-literature