This is what I'm thinking... what's new?
The ovelying premise may seem obvious, but what was more important to realize is that the research shows evidence crossconnection of sensory processing in parts of the brain that were previously believed to be isolated.
Direct connection between the audio and visual cortex that was not thought to occur, and proof that the visual cortex does process audio information.
Yes, sound and vision are interrelated in the brain, but previously it was believed to not occur until regions of higher brain function, not at the level of basic sensory input.
David