Changes

== Data selection ==

== Data selection ==

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]:

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]]:

[[File:DocsSectionsExampleSpellerPart1_speller_common_data.png|456px|53x]]

[[File:DocsSectionsExampleSpellerPart1_Speller_common_data.png|456px|53x]]

''Figure 4: DataSelection table''

''Figure 4: DataSelection table''