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    Have you ever read those things like "You are now aware of blinking.  You are also now aware of your tongue in you mouth.".  And suddenly you are increasingly uncomfortable by paying attention to those things? The cause of this is selective attention and surprise surprise, it is a psychology term.  There is just so much to learn and write about psychology.  Selective attention is your brain's ability to focus only on things that are important to your perception at that moment.  It's really an amazing thing.  Imagine the trouble you would have functioning in real life if you constantly paid attention your clothes brushing against your skin? You would never have time to think of anything else!  It is our brains way of making sure we can advance in our thinking, and think of new, innovative ideas.  The concept interests me, so when I saw an article on bbc about it I decided to check it out, see what it says.  They also mention the interesting fact that your eyes are the only sense that never do this.  You eyes never use selective attention.  They are constantly moving in their sockets; just a tiny bit, but always moving.  If you've ever pressed your fingers to the outside of your eye sockets for more than a few seconds, you will find that your vision starts going black.  This is because once your eyes stop moving, they stop taking in new information, and thus start ignoring the image that's being sent over and over again.  Just a kind of interesting concept!