Figure 5

Hand exoskeleton-closing motions in % relative to a full closing motion during EEG control (condition #1, left side) and hybrid EEG/EOG BNCI control (condition #2, right side) averaged across all participants while green or red squares were presented. Participants were instructed to close the hand exoskeleton during green square presentations (black circles/crosses), and not to move during red square presentations (red circles/crosses). All participants were able to successfully close the device and reached successful control during green square presentations. However, during condition #1, the safety threshold (set at 25% closing motions during red square presentations) was often exceeded, but only once under condition #2.