The grand averaged RSS waveforms and dipole locations. (A) The grand averaged RSS waveforms in each task of the two conditions in the SI, SIIc, SIIi, and PC. A vertical line indicates the onset of stimulus. Prominent responses were observed at around 20 ms (M20) and 35 ms (M35) in the SI, around 85 ms (M85) and 150 ms (M150 SIIc) in the SII contralateral to the side of stimulation, around 90 ms (M90) and 150 ms (M150 SIIi) in the SII ipsilateral to the side stimulated and around 95 ms (M95) in the PC. A reduction in SI components and an enhancement of SII components were identified with movement execution. In addition, the M85 showed significant enhancement in the Asymmetric task of the Mirror condition. (B) The location of equivalent current dipoles (ECDs) in each component superimposed on the T1-weighted magnetic resonance images. The ECD for short-latency responses was located in the posterior bank of the central sulcus (SI) in the hemisphere contralateral to the side stimulated, and the long-latency responses (M85 and M90) were identified in the bilateral temporal regions around the upper bank of the sylvian fissure, corresponding to the SII. The source of the parietal activity (M95) was located medial and posterior to the SI hand area in the hemisphere contralateral to the side stimulated.