Figure 9: Spontaneous recovery.
We simulated an experiment in which a 30° visual rotation for 50 trials (the initial learning phase) was followed by a −30° visuomotor rotation for 5 trials (the opposite force-learning phase), and error-clamp trials were imposed. In the simulation of the error-clamp trials, the movement error, et, was forcibly set to 0°. (a) Trial-by-trial change of pt and xt averaged across 10 simulations. (b) Previously reported spontaneous recovery (reproduced from Smith et al.1). (c) Activities of each primitive, with a strong white colour indicating high activity. Vertical dotted lines are drawn for the trials when the phases switched. Horizontal dotted line denotes the line on which êt=0. (d) Weighting parameters for each primitive. Blue and red colours indicate weighting parameters to compensate for perturbations of positive and negative values, respectively.
