Nerve signaling carries information throughout various relay stations in the brain - visual signals, for example, start in the eye, travel to the back of the brain and then on to other brain areas for more advanced processing. Yet in many cases signals are also sent in the reverse direction. Such reverse signaling may play a role in learning or even conscious awareness, but nobody knows for sure what back projections do. A lot of stuff happens in the brain all on its own, without the need for some stimulus evoking a response. It would be nice to know why, and what for. 6.
Brains are the seat of rational thought, but mixed in are the drives and moods of the emotions.
Some are known, but there are others to be discovered. No. 10 impinges on the grand question of what is consciousness, surely too big for Goldilocks. In fact, Dr. Churchland declares, it might not even be a good question for anybody, for the idea of consciousness may turn out to be too primitive to be useful when the brain is fully understood. Answering all of the above questions may bring science a lot closer to possessing such understanding. But no doubt other questions will be important, too.