The Dissociation of Interlimb Constraints

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Abstract
Recent research on the coordination of limb movements has strengthened the position that groups of muscles, constrained to act as functional units (also called synergies), form the significant units of movement control. Neverthe- less, in meeting new task demands, preferred synergies often have to be de- composed in order for differentiated patterns of action to emerge and this phenomenon has received limited attention so far. In this study, the role of kinematic (displacement) information feedback on the dissociation of upper limb movements with different spatiotemporal features was investigated (i.e., a flexion movement was made in the nondominant limb together with a flex- ion-extension-flexion movement in the dominant limb). In comparison to no kinematic feedback, displacement information feedback resulted in a lower degree of coupling, as determined by cross-correlating the acceleration func- tions of both limb movements. These effects largely persisted across retention intervals as long as 5 months....

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