Towards User-Friendly Spelling with an Auditory Brain-Computer Interface: The CharStreamer Paradigm
Figure 4
Usability ratings for the three conditions.
Plot A shows the global subjective ratings for each condition. The overall preference for daily use is indicated for each participant by a tick mark. Arrows indicate, if larger or smaller ratings are better. Plot B depicts the average rating, of how well the user could focus on the target letter during each trial in the calibration.