You just know everything, don’t you? 
Although I guess that could be considered a reflex and the person’s conscious realization of it, rather than an action of will per se. For example, when the doctor hits your knee, it jerks up before you really realize it yourself. So, once you know what a glass of water is and you know that one is in front of you, then your natural thirst could cause a similar reaction.
I think what I meant is whether or not our consciousness itself could be considered a sense that must be synchronized with all our other senses. I was first thinking that they are brought together and then presented to our conscious mind, so that we can react and “choose” what we should do.
But maybe it is just the result of our neural connections and such, ie the output process of our brain’s calculations–similar to a computer and it’s monitor. There’s the harddrive and all the internal components, but all we experience is what is shown on the screen (our perception of the world). When you search for something on a computer, it goes through all the files and attempts to find what you are looking for, but it only presents you with what you searched for, because showing you a list of everything would defeat the purpose of the search function. So perhaps our consciousness is the development of an “evolutionary user-friendliness.” Catch my drift?
I guess the main reason I’m saying this is because there are many times where I’ve been able to remember things due to certain associations I’ve already made before, or I’ll be mentally relating too seemingly random things until I find out what it was I was trying to remember. For example, I try to remember what band I am hearing, and I begin thinking about “House, MD”, the show, for some reason. I’m not sure if the song was played on the show or not. I finally remember which band it was (Coldplay), and I realize that an actor on another show, MadTV, who looks like the actor who plays the main character in House, did a parody of a Coldplay music video that I happened to remember. Often times I’ll somehow try to use what I’ve forgot in a sentence. For instance, if I forget someone’s name, I’ll imagine saying, “Hey _____, how are you?” until I automatically fill in the blank. What’s weird is that it works well, but I’ve noticed that I will remember the name in some form–yet still be unable to spell it or pronounce it correctly until I’ve thought some more. The information, for once, actually feels as if it is just being filtered and fed to me from my subconscious.
In short, what if our consciousness is actually nothing but the result of our combined, synchronized senses/memory coming together–nothing more, nothing less. Our choices are simply the result of one telling the other what to do, and we just experience the middle and believe that we are controlling it. Or not. 