[Asmodeus]

There is indeed enough variation. I unfortunately can't find the link, but they went further and had people imagine something like the letter 'n,' and of the whopping eight people they tested, one came out completely garbled, even after training.

Also, I suspect that variation increases with abstractness, so it will almost certainly be impossible to extract high level thought without extensive cooperation.

For example, the brain state that the word 'conciousness' invokes in me is going to be entirely different from you because I have different associations, examples, knowledge, and general representation.

Now try to extract an entire sentence without training first. Have fun!