P300 Speller row and column selection

[Haibin]

Hi, everyone,

The P300 Speller example in BCI2000, the rows and columns flashes in a mixed random order. I want to present stimuli from row and column separately. First choose the row which stimuli were shown in random order, then choose the column. Is it possible in BCI2000 and how to do it? Many thanks.

Haibin ZHAO