Fig. 2.

Task-related signal modulation over 36 months. (A) Correlation (R²) of HFB-power (65–95 Hz) with the Localizer task condition (rest vs. attempted hand movement), for all pairs on the motor electrode strip. The correlation was calculated between the mean HFB-power (over time) per trial and the task condition (active vs. rest). In red, the pair used for BCI control and home use. (B) Mean score per week on the Target-task using HFB-power of pair e2-e3 on the motor electrode strip. The Target-task was mainly used to familiarize the user with brain control. Therefore, the number of instances was higher in the first months after implantation than in the last months of this graph. Chance level is 48.4%, overall mean score was 91% (grey line), grey shading indicates the standard deviation of the mean. For both panels, the triangles represent the data collected after the research period (from November 2017).