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Hypothetical learning curve during adaptation to an arbitrary visuomotor perturbation. The perturbation is imposed during movements 100–200. Target errors are initially in the direction of the perturbation, but, with training, adaptation occurs. The perturbation is removed on trial 201 and an aftereffect is observed in which target errors are in the direction opposite to the perturbation. The size of the visuomotor perturbation is in arbitrary units (percent).
