The main problem researchers have to deal with in the area of speech production and bimodal speech perception (by ear and by eye) is the coherence of the acoustic and the visual signals (see [84,208,63], for extended discussions of this phenomenon). I will briefly present experimental results obtained from perceptual studies where various kinds of coherence were not respected: When the auditory and visual information channels have spatial, temporal, or source differences.
Esprit Project 8579/MIAMI (Schomaker et al., '95)