Demographic, disease and AT/BCI related data of end-users; speaking not possible unless mentioned.

1The numbers for level of impairment are according to Kübler and Birbaumer (2008): 1 = minor impairment: slightly impaired limb movement, normal speech; 2 = moderate impairment: restricted limb movement (wheelchair) and unaffected speech OR intact limb movement, but no speech; 3 = major impairment: almost tetraplegic, restricted speech; 4 = locked-in state: only few muscles for communication (e.g., eye movement), no speech. Demographic, disease and AT/BCI related data of end-users; speaking not possible unless mentioned.