Fig. 1.

Experimental setup. (A) Schematic plot of the measuring device for simultaneous acquisition of grip force (GF) and acceleration in 3 dimensions (AccZ, AccX, AccY). Acceleration in the Z-direction (AccZ) equals the loading force (LF). (B) Illustration of the correlation between grip force and loading force (i.e. acceleration in Z direction) for upwards (black) and downwards (gray) directed movement in one patient during the shaking task (C) behavioral data (grip force GF and loading force LF) and electrophysiological data (local field potentials LFP and surface EEG) were recorded simultaneously. (D) Projection of the reconstructed electrode position onto a 3D-Atlas (Sarnthein et al., 2013). The second lowest contact (red) of the electrode (blue) is located in the dorsal STN (green) and this signal was used for subsequent analyses. Red nucleus (red) and thalamus (gray).