On the other hand, if you have the traffic analysis done well enough, the information decoding is unimportant. Given the brain's pretty strong region specific activity, what parts of the brain are acting up are a pretty good correlate of the data in the stimulus.

To borrow and extend an example from Ender's Game, if you know what the train schedules are, you can figure out troop movements; even if you don't necessarily know which particular unit is going to which place, you still have a pretty good idea of what the military is gearing up for.