As Ven Pesala says, the labelling is a technique to aid noticing the object. This can be remarkably difficult when you are starting out. I think it took me months
before I was really
noticing motion of feet, abdomen, etc. For quite some time I believe I was imagining
... it seems the words used during one's insight meditation mask the phenomenon being observed slightly ...
there is something not quite right. The idea is quite the opposite of "thinking about the object", the idea is to discern the object more clearly without
thinking or internal chatter, etc...
This takes a bit of practice, and for some people it's confusing. If you work with a good teacher, or read and listen carefully to books and on-line talks from good teachers, it should become much clearer.
See also my reply in this thread: http://dhammawheel.com/viewtopic.php?f= ... 88#p214588