People were more accurate at detecting a flash of light when a sound was produced at the same location, suggesting that sound can help direct visual attention. It will be interesting to see, say the researchers, what happens to the ability to pay attention when one of the senses does not function as well as it should, as in a person who is blind or hearing impaired. They also noted that research into the relationship between sight and sound could affect the way we look at people with attention disorders-those who have a hard time paying attention. In some people, the researchers say, the problem may stem from hearing or sight deficits, or in relating sight and sound together. The many ramifications of the sight-sound relationship are now receiving due attention.
Many sensitive people see a colour for every sound.
One sense must certainly merge at some point into the other. So also sound can be translated into taste. The senses are interchangeable once we admit correlation. Moreover they can all be intensified or modified very considerably. You will now understand the reference in the Vedas and Upanishads , where sounds are said to be perceived.