Simon-conflict Task.

This experiment includes 147 subjects: 99 individuals with Parkinsons disease, and 48 controls. Subjects completed this Simon task (along with multiple other cognitive tasks) while EEG was recorded with a 64-channel BrainVision cap. This task included a stimulus presented to the left or right side of the screen. The researchers instructed participants to press a left key when the was yellow or red and a right key when it was cyan or blue. The stimulus was either spatially congruent with the screen side matching the response hand or incongruent with the screen side contralateral to the response hand. The researchers analyzed data from congruent and incongruent trials separately.