FBindex

If the trial contains more than one FB-command, this optional argument can be used to assign the DROPOUT action to the i-th FB-command within a trial definition:

 Example for activating dropout mode

SESSION
RUNTRIAL ShowMessage StartExercise
DROPOUT 1          ; Activate dropout mode for next block
RUNBLOCK Exercise 10 0          ; Run block until all trials are answered correctly

RUNTRIAL ShowMessage StartBlock
DROPOUT          ; Disable dropout mode
RUNBLOCK Blk 120          ; Run 120 valid trials