Yes. I personally believe that deja vu occurs when impulses in your brain move down parts of paths in your neural network that have previously been traveled in that sequence, and may or may not be recalled by you consciously. The entire path is more than likely not replicated, rather some part of the path is being re-traveled and your brain recognizes this, whether you do consciously or not. When you do something over and over again, most likely your brain is sending messages over its network across the same or very similar paths every time, but you are conscious of this and thus you remember it and expect certain things to happen. During deja vu your brain may utilize part of a previously traveled network path and it recognizes this and may send a message to your consciousness indicating that "hey, you're doing something you've done before, expect this". However, if you were not consciously aware of this previous path it is likely you do not fully recall it and hence it 'feels' like something you've seen or done before, but you can't quite recall it.