As explained in the introduction, the visual speller is based on the brain response to the flashing rows and columns. Therefore, we need to collect a certain amount of data after each flash. The highlightGrid function (see the [[#StimPres|Stimulus presentation section]]), inserts a marker highlightOn each time a row or column of the grid is highlighted. As we need accurate synchronization with the data, this marker is inserted [[BrainStreamMarkerHandling#HardwareMarker|via the hardware]]. Data selection is specified for the highlightOn marker in the speller_common import-table. This is the import-tables' [[BrainStreamBuildingExperiments#SecDataSel|DataSelection table]:
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As explained in the introduction, the visual speller is based on the brain response to the flashing rows and columns. Therefore, we need to collect a certain amount of data after each flash. The highlightGrid function (see the [[#StimPres|Stimulus presentation section]]), inserts a marker highlightOn each time a row or column of the grid is highlighted. As we need accurate synchronization with the data, this marker is inserted [[BrainStreamMarkerHandling#HardwareMarker|via the hardware]]. Data selection is specified for the highlightOn marker in the speller_common import-table. This is the import-tables' [[BrainStreamBuildingExperiments#SecDataSel|DataSelection table]]: