A very interesting article: Sound Adds Speed To Visual Perception it suggests, I think, that our intuitions and research suggesting that multi-channel presentation of information is more effective at conveying information is well-founded neurologically: "recent finding of nerve cells projecting from the auditory cortex (associated with the perception of sound) directly into the visual cortex (associated with sight), suggest that perception of one sense might affect that of another without the involvement of higher brain areas."
In other words: multi-media is good.
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