In one of their experiments, Warren et al. had their subjects localize visual or auditory components of visual-auditory stimuli (videos of people speaking and the corresponding sound).
Stimuli were made
compelling' by playing video and audio in sync anduncompelling' by introducing a temporal offset.
They found that their subjects performed as under a
unity assumptions'' when told they would perceive cross-sensory stimuli, and when the stimuli were `compelling' and under a lowunity assumption'' when they were told there could be separate auditory or visual stimuli and/or the stimuli were made `uncompelling'.⇒