Quo vadis P300 BCI?

The P300 event-related potential is often used as input signal for BCI control. BCI researchers often invest time in studies on stimulation and classification procedures that remain below results already achieved. Translational studies are sparse and also their results have only little impact on BCI research and development. Potential reasons for the lack of substantial translational research including end-users in the field may be lack of funding and the effort involved in relation to the scientific merits to be expected. Remedies may be better knowledge and adoption of available results. An increased effort to derive new questions for basic and application oriented research with the P300-BCI is essential to move the field beyond its current limits.