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This task presents a basic Sound Induced Flash Illusion (SIFI) task. Participants are first asked to judge the number of auditory beeps that they hear (1 or 2) they are then asked to judge the number of visual flashes they see (1 or 2). Flashes are acompanied either by a congruent or incongruent number of auditory beeps or no beeps.

Code using the shelf to allocate participants into n groups, which only stores the allocation if the participant finishes.