Fig. 2
Experimental setup. Participants sat in a chair with their arms on a table, upon which a laptop was located. The intervention provided visual and auditory stimulation through the screen (a) and speakers (b) of the laptop, respectively, vibrotactile feedback through three independent vibrators (c), and transcranial direct current stimulation (d). Interaction was allowed through gaze, detected by a portable eye-tracking bar (e) and muscular activity and movement, detected by the gyroscopes, accelerometers, and/or surface electromyographic activity of a motion control armband (f)