Demographic information of the users (N=28), caregivers (N=29) and researchers (N=29) included in this study was extracted from Section 1 of the questionnaire. A) Information (in percentage) about the user’s gender (male, female), age group (≤ 50 years old, > 50 years old), living situation (at home or at a nursing home), etiology (neuromuscular disease, NMD; sudden onset, SO) and whether they were naïve to BCI. B) Information (in percentage) about the caregiver’s gender (male, female), age group (≤ 50 years old, > 50 years old), personal/professional relation to the user (family member, professional caregiver), type of LIS of individual the caregiver takes care of (neuromuscular disease, NMD; sudden onset, SO), and whether they were naïve to BCI. C) Information (in percentage) about the researcher’s gender (male, female), age group (≤ 50 years old, > 50 years old), continent of residence (Asia, Europe or North America), and whether they worked with individuals with locked-in syndrome (LIS) and communication Brain-Computer Interfaces (cBCIs). Bar plots indicate most used signal acquisition techniques by researchers in their line of work, as well as the most investigated mental strategies for controlling a BCI.