[ That's a very good question, Cloud... One that canon does not even have an answer for! It is why Ayaka does not know how to properly respond, taking her time to think first before answering. ]

Visions manifest differently from one person to another, so I do not really know the scientific explanation to it.

[ And it can't be explained scientifically to begin with, when it is all mystical. ]

When you receive your Vision, should be fortunate enough, then you just know. The application is embedded in your mind, as if you had the Vision all along.