Figure 1.

Experimental Paradigm. (A) Participants fixated on the central cross hair as the red dot moved clockwise toward the two blue dots, displacing each green dot in turn. Participants were instructed to make one finger-tap movement when the red dot was within the blue area, but only one movement per revolution. Each revolution took approximately 6 s. (B) The temporal onset of finger-tap responses were determined using a laser system. Essentially, finger movement interrupted a laser-beam that extended across a narrow groove, with the groove functioning as the finger landing area for the completion of each tap. This disruption of the laser beam was registered by the MEG system and synced with the neural data.