Fig. 3.

Coronal, axial, and sagittal views of clusters in which a significant task-by-group interaction was seen for initial speed (p<0.05, cluster-corrected), or number of correct sequences typed during the first task block. To illustrate the task-by-group interaction, mean resting blood flow (in mL/100g/min) extracted from a cluster in the left occipital lobe and cerebellum (cutout) is plotted against task performance (inset graph). In PD, greater initial speed was related to higher rCBF, whereas greater initial speed was related to lower rCBF in controls