Adaptation to bimanual asymmetric weights in isometric force coordination
Research highlights
▶ Bilateral weighting coefficients influence the task performance. ▶ Bimanual force coordination patterns correlate nonlinearly with weighting coefficient. ▶ Interaction of constraints organizes motor coordination and control patterns.
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Coherence and interlimb force control: Effects of visual gain
2018, Neuroscience LettersCitation Excerpt :Participants tried to match the weighted sum of individual finger forces to the target. Unequal coefficient ratios essentially caused different contributions from each hand to total bimanual force resulting in force asymmetry [11]. Given that visuomotor processing during force control was highly associated with force oscillation below 4 Hz [29], we hypothesized that peak coherence at 0–4 Hz was higher at high gain when two hands produced symmetrical forces.
Goal conceptualization and symmetry of arm movements affect bimanual coordination in individuals after stroke
2016, Neuroscience LettersCitation Excerpt :A critical difference between independent- and common-goal tasks is that task success in common-goal tasks is dependent on cooperative interaction between the two arms. Thus, the performance of each arm can compensate for, and covary with that of the other to accomplish a common goal [12–15]. Functional imaging in healthy adults has demonstrated that distinct neural substrates underlie performance of independent- and common-goal movements [16].
Increased visual information gain improves bimanual force coordination
2015, Neuroscience LettersCitation Excerpt :Furthermore, evidence indicates that the amount of visual information about the task (i.e., 8 versus 80 pixels/N) interacts with the asymmetry of bimanual coordination tasks. At a visual gain less than 80 pixels/N, motor performance improvements by visual information were greater for the symmetric than the asymmetric bimanual coordination tasks [5–8]. However, sparse evidence exits on whether the interaction between visual information and bimanual force control symmetry persists for higher visual information gains (i.e., 256 and 512 pixels/N).
Force control in chronic stroke
2015, Neuroscience and Biobehavioral ReviewsCitation Excerpt :For example, lower RMSE and force variability indicate better task performance during force control in aging studies (Baweja et al., 2009; Hu et al., 2011; Tracy et al., 2007; Vaillancourt and Newell, 2003). A common finding across studies indicates that elderly groups show greater RMSE, SD, and CV than young control groups (Baweja et al., 2009; Hermsdorfer et al., 2003; Hu et al., 2011; Hu and Newell, 2011; Ofori et al., 2010). Similarly, during bimanual isometric force control, stroke survivors revealed higher task error (e.g., greater RMSE) at submaximal force levels (e.g., 5–50% of MVC) in comparison to an age-matched control group (Lodha et al., 2010).
Bimanual force variability in chronic stroke: With and without visual information
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