Context-dependence of Aimed Arm Movements: A Transitory or A Stable Phenomenon?

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    Previous work documented that grasping movements in a typical laboratory context differ widely from those in a more
    natural context. We evaluate whether this context-dependence changes with experience.
    Data from 48 subjects (24 female; 24.9 ± 2.7 years of age) were (re)analyzed. They had participated in experimental
    blocks with externally triggered, purposeless and repetitive movements (context L, laboratory-like), and a block with
    self-initiated, ecologically valid movements embedded in a complex task (context E, everyday-like). Mechanical
    constraints on grasping were identical in both blocks.
    A global metric, representing context-dependence across multiple kinematic parameters, did not change appreciably
    across the 20 trials of a block. Furthermore, the metric was not affected by prior participation in the other block.
    We conclude that context-dependence of grasping is robust, i.e., it shows little influence of prior experience. This opens
    the avenue for within-subject designs on context-dependence, e.g., for clinical investigations.
    Original languageEnglish
    JournalInternational Journal of Kinesiology & Sports Science
    Issue number4
    Number of pages7
    Publication statusPublished - 31.10.2014