 The second component (BP2 or BP late) is generated by the motor cortex (M1).Contrary to earlier views, the intentional activity according to Kornhuber and Deecke does not travel directly from the SMA to motor cortex M1 but is running via the cortico-basalganglio-thalamo-cortical loop in short motor loop.The motor loop has been discovered in patients with Parkinson's disease (PD).It could be shown, that deep brain stimulation improves frontal cortex function in PD patients.