FIGURE 6.

Neuropsychological studies of explicit strategy. (A) A 45° counterclockwise rotation was imposed for trials between the dotted vertical lines and participants were instructed to reach to the landmark clockwise to the target. Patients with cerebellar degeneration (light circles) showed less drift than the Control participants (dark), as well as smaller aftereffects, consistent with predicted impairment in adaptation. (B) Patients with unilateral lesions in the prefrontal cortex (light) showed greater drift than their matched control group (dark), although the aftereffects were similar. This pattern is indicative of an impairment in strategy change with intact adaptation. (C) Lesion reconstruction for patients with prefrontal cortex damage. The reconstructions are overlaid and individually colored for each patient.