Fig. 1.

Overview of the implanted brain-computer interface system. (A) Electrode-strip locations. During a first surgery, two strips were placed on the primary motor cortex and two on the dorsolateral prefrontal cortex. For both regions, one strip was placed over the primary target area, as determined using presurgical fMRI, and one was placed on a secondary target area as a backup. One strip over each area was connected to the device (see inserts) during a second surgery. These strips were selected based on correlation of the signal with the task condition of Localizer tasks performed during two days of testing between the two surgeries (see Vansteensel et al., 2016 for details). The bipolar electrode pair e2-e3 (indicated with black circles in top right insert) is used for BCI-control. (B and C) Overview of the BCI components and the location of the implanted parts. Adapted with permission from Vansteensel et al. (2016).