The same thing happens with repetition while playing beats for you listening audience. I feel as drummers we often don't realize that by playing the exact same thing for a few mins puts everyone listening in a trance. Remember the power of repetition as well as chops.I notice, after I'm in the zone, I hear the reverberations of my other drumheads sympathetically vibrating, pretty loud it seems too. But when I first start the exercise, before I am in the zone, I can't hear the reverberations. And I am listening for them. Where did they go? Nowhere, it's my awareness that hasn't heightened yet. Very strange. Something happens with repetition. When you hear the exact same click for 20 minutes or more straight, something happens. It triggers a meditative state or something. (if you allow yourself) Then the reverberations are very much noticeable to me. I get temporary super hearing, it's cool.