The values of the time constant τ and the weight on the state cost q changed the variability in the data explained by the model. (a) Time-series of the RA in the point-to-point task (pure flexion target) for different values of τ. The data is charted alongside for reference. The weight on the state cost \(q = 1000\) was kept constant. R2 increased with larger τ, plateauing at \(5.5\) s. (b) The weight on the state cost q was varied while \(\tau = 5.5\) s was kept constant. R2 tended to increase with greater weight on the state cost q.