Figure 1

Transcranial electrode implantations. (A) External skin landmarks of the motor cortex (Mo), the cruciate sulcus (blue arrow) and the somatosensory cortex (Se), which are respectively located from 1 mm to 3 cm lateral to the midline (ruler) at the level of the posterior margin of the eyelid, from 0 to 4.5 cm lateral to the midline at the level of the posterior margin of the orbit and from 1 mm to 3 cm lateral to the midline at the level of the anterior edge of the ear. (B) Skull landmarks of the skull-screw electrode (encircled cross) located over the hind- and forelimb motor cortical representations, 2 cm lateral to the midline (blue dashed line) at the level of the posterior margin of the eyelid (blue arrow). (C) Insertion of 2 skull-screw electrodes, one on each side of the skull (blue arrows). (D) Connection between the right electrode and a crocodile clip connected to the stimulator.