Figure 2.

In the visuomotor rotation task, the cerebellar degeneration (CD) group reached a lower level of adaptation and exhibited a smaller aftereffect relative to the control group. A, Hand angle over the course of the experimental condition. Means and SDs are shown for control participants (blue) and individuals with cerebellar degeneration (red). Visual feedback was withheld in the shaded phases. The perturbation is shown with a dashed black line. B, C, Individual data (semitransparent dots) and group means ± SE for the CD and control participants during the last 15 reaches of the perturbation phase (B) and 15-trial aftereffect phase in which the visual feedback was withheld (C). Red diamonds indicate individuals with SCA6 and SCA8; red circles indicate the other CD participants.