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The probability that two stimuli in different modalities are perceived as one multisensory stimulus generally decreases with increasing temporal or spatial disparity between them.

The probability that two stimuli in different modalities are perceived as one multisensory stimulus generally increases with increasing semantic congruency.

The unity assumption is influenced by exogenous and endogenous factors:

  • degree of discrepancy between cross-modal percepts,
  • active involvement (in proprioception),
  • awareness of discrepancy,
  • expectation,
  • compellingness.