From what I understand, Brain-Computer Interaction similar to GUI or VUI. Except for the method of input is characterized as a direct output from the brain. My question is would a method of EMG based control be BCI or HCI?
From what I find most BCI research delves in the realms of EEG, MEG, and Motor imagery. Would EMG be considered under the wider scope of HCI because it is not a signal of intention but activation?