Towards Improved Vibro-Tactile P300 BCIs

The vibro-tactile P300 based Brain-Computer Interface is an interesting tool for severe impaired patients which cannot communicate using the muscular and visual vias. In this study we presented an improved tactile BCI for binary communication that reduces the wrong answers by adding a threshold to the decision value to achieve a valid answer, otherwise, the BCI gives an indecisive answer to the question. The threshold is calculated using a statistical test on the EEG, data recorded during the question to the patient. In total 7 tactile stimulators were placed on different parts of the subject’s body. We tried the new BCI with 4 healthy subjects and using the statistical test they were able to get no wrong answers after 10 questions asked to each participant. The spelling accuracy and information transfer rate with and without statistical test are presented as well as examples of event related potentials.