Fig. 4.

Sensor level responses evoked by DBS of the subthalamic nucleus in PD patients (unfiltered). Each sub-plot depicts the response of one subject, averaged over 3–5 sensorimotor channels ipsilateral to stimulation. The inset shows an example of very early responses (<10 ms) for patient PD 1, showing peaks at 1 and 4 ms, respectively (red arrows). Stimulation amplitude remained constant. The time axis is restricted to the first 60 ms, as subject-specific responses were consistent only within this period. Please note that the y axis scaling is generally smaller than in Fig. 2.