A Sensorimotor Model for Computing Intended Reach Trajectories
Fig 9
Predicted temporal shift of sensorimotor activity in PPC during visuomotor adaptation.
(A) Simplified model of the motor control system. Desired trajectory signals can be used to produce movement using feedback (red) or feedforward (blue) mechanisms. During adaptation, a gradual shift from feedback (reactive) control to feedforward (predictive) control is observed. (B) When generating movement from a given desired trajectory signal (upper), the use of reactive forces (middle, red) will lead to a corresponding delay in the motor output (lower, red). As motor control forces become increasingly predictive (middle, blue), the delay between the desired and the actual movements will diminish.