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Directional tuning changes reflect both fast and slow components of learning. A and B: average changes in preferred direction (ΔPD) of both the perturbed and unperturbed groups for monkeys N and C, respectively. C and D: ΔPD for the perturbed (red) and unperturbed (blue) groups of neurons. E and F: difference in ΔPD of the perturbed and unperturbed groups (perturbed − unperturbed). Shaded areas around lines represent SE. Gray rectangle background indicates the perturbation session.
