A and B, STN-HFS evoked opposite responses in neighbouring SNr neurons; paired recordings in whole-cell (A) and in cell-attached (B) configurations. Stimulation artifacts were partly removed for clarity of the figure. C and D, STN single stimulation performed in the same neurons as in A and B, respectively. Similarly to STN-HFS, STN single stimulation induced opposite evoked responses in neighbouring SNr neurons recorded in double patch-clamp. Note in the upper panel in D, the action potential (recorded in voltage-clamp mode) evoked by a STN single stimulation. In the lower panel in D, stimulation artifact was partly removed for clarity of the figure.