3.1.1. BCI Unit

The BCI device that was used, in order to capture the alpha brainwaves during the developed experimental procedure, is the OpenBCI Ganglion [25], which is shown in Figure 3. This board has 4 available input channels and samples data at 200 Hz.

**Figure 3.** Overview of the Open Brain–Computer Interface (BCI) Ganglion unit used.
