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#tweeprint time: rapid feedback adaptation to force field of different direction and different kinds in 250ms (thread): biorxiv.org/content/10.110…
Simplistic view in reach control and adaptation is that the compensation for external loads is supported by impedance control within a trial, and trial by trial adaptation. This paper continues a series where we show that the story is likely more complex...
First unpredictable loads induce changes in co-contraction which correlated with changes in feedback gains, we suggested that instead of making the limb stiff, co-contractions makes the neural controller more robust: doi.org/10.1523/JNEURO…
Second we observed recently that reach control within a force field trial applied randomly improved, which cannot be explained by assuming a fixed representation. We suggested that this reflected the presence of rapid, within movement adaptation: doi.org/10.1101/269134
In the latest preprint, we sought to extract correlates from EMG to measure the latency of motor adaptation. We found: 250ms.
Furthermore, a prediction of the adaptive control model is that one should be able to learn different FF kinds and direction at the same time...
Furthermore, a prediction of the adaptive control model is that one should be able to learn different FF kinds and direction at the same time...
This was observed experimentally: feedback control adapted to curl and orthogonal force fields, CW and CCW applied randomly, and the feedback response was tuned to the specific perturbation profile within each trial...
