Regions showing significant group and medication effects during the decision phase.

fROIs are displayed in Figure 3 (right column; yellow). Brodmann areas (BA) were defined by the Talairach and Tournoux atlas. Coordinates represent distance in mm from anterior commissure: x, right(+)/left (−); y, anterior (+)/posterior (−); z, superior (+)/inferior (−). B = bilateral hemispheres; L = left hemisphere; R = right hemisphere; GP = globus pallidus.1This column designates areas wherein the temporal dynamics of activation during the second half of the hemodynamic response (decision period) differed between the control and PD OFF groups (G X T).2This column designates areas wherein the temporal dynamics of activation differed between the OFF and ON medication conditions (Med X T).