Fig. 2.

Difference in brain activation between normal subjects and PD patients for the difference between self-paced and triggered movements. PET study comparing PD patients and normal subjects making self-paced index finger extensions compared with sensory triggered index finger extensions with the same pattern of timing as with the self-paced movements. Note that normal subjects have greater activation of the SMA, anterior cingulate, left putamen, left insular cortex, right DLPFC and right parietal area 40. From Jahanshahi et al. (9) with permission.