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21 In this case used stimuli should be marked. The trial duration (field “Duration”) and stimuli parameters (fields “Start” and “Exposition”) should be also defined. The buttons “Select all” and “Unselect all” help to mark stimuli. 4. Modify parameters of selected trials – button “Modify” [Fig.16]. The next dialog window is used to modify the parameters of trials [Fig.19]. Fig.19. Only modified parameters of trial should be defined during this procedure. Unfilled fields will be ignored. 5. Delete selected trials – button “Delete” [Fig.16].