During rhythmic pointing movements, degrees of freedom (DOF) in the human action system-such as joint-angles in the arm-are assumed to covary to stabilise end-effector movement, e.g. index finger. In this paper, it is suggested that the end-effector movement and the coordination of DOF are reciprocally related in synergies that link DOF so as to produce the end-effector movement. The coordination of DOF in synergies and the relation between end-effector movement and DOF coordination received little attention, though essential to understand the principles of synergy formation. Therefore, the current study assessed how the end-effector movement related to the coordination of joint-angles during rhythmic pointing across target widths and distances. Results demonstrated that joint-angles were linked in different synergies when end-effector movements differed across conditions. Furthermore, in every condition, three joint-angles (shoulder plane of elevation, shoulder inward-outward rotation, elbow flexion-extension) largely drove the end-effector, and all joint-angles contributed to covariation that stabilised the end-effector. Together, results demonstrated synergies that produced the end-effector movement, constrained joint-angles so that they covaried to stabilise the end-effector, and differed when end-effector movement differed. Hence, end-effector and joint-angles were reciprocally related in synergies-indicating that the action system was organised as a complex dynamical system.


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    Titel :

    Synergies reciprocally relate end-effector and joint-angles in rhythmic pointing movements


    Beteiligte:
    Valk, Tim A. (Autor:in) / Mouton, Leonora J. (Autor:in) / Otten, Egbert (Autor:in) / Bongers, Raoul M. (Autor:in)

    Erscheinungsdatum :

    2019-11-22


    Anmerkungen:

    Valk , T A , Mouton , L J , Otten , E & Bongers , R M 2019 , ' Synergies reciprocally relate end-effector and joint-angles in rhythmic pointing movements ' , Scientific Reports , vol. 9 , 17378 . https://doi.org/10.1038/s41598-019-53913-9



    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



    Klassifikation :

    DDC:    629 / 796



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